diff --git "a/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\344\270\200\346\254\241\344\275\234\344\270\232/hellow word.PNG" "b/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\344\270\200\346\254\241\344\275\234\344\270\232/hellow word.PNG"
new file mode 100644
index 0000000000000000000000000000000000000000..d71a7283221ed3e0ebc75dd3bb0ed16073dfb182
Binary files /dev/null and "b/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\344\270\200\346\254\241\344\275\234\344\270\232/hellow word.PNG" differ
diff --git "a/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\344\270\200\346\254\241\344\275\234\344\270\232/hellow word.cs" "b/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\344\270\200\346\254\241\344\275\234\344\270\232/hellow word.cs"
new file mode 100644
index 0000000000000000000000000000000000000000..a864fc4b52941880d0e34017e01584076f69b8d8
--- /dev/null
+++ "b/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\344\270\200\346\254\241\344\275\234\344\270\232/hellow word.cs"	
@@ -0,0 +1,16 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace ConsoleApp1
+{
+    internal class Program
+    {
+        static void Main(string[] args)
+        {
+            Console.WriteLine("Hello Word!");
+        }
+    }
+}
diff --git "a/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232/\350\245\277\346\270\270\350\256\260.cs" "b/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232/\350\245\277\346\270\270\350\256\260.cs"
new file mode 100644
index 0000000000000000000000000000000000000000..0c816947eab67e9a2a4df346a8b07a5423de5408
--- /dev/null
+++ "b/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232/\350\245\277\346\270\270\350\256\260.cs"
@@ -0,0 +1,37 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace zbxa
+{
+    internal class Program
+    {
+        static void Main(string[] args)
+        {
+            Student.Teacher = "唐僧";
+
+            Student student1 = new Student("孙悟空");
+            Student student2 = new Student("猪八戒");
+            Student student3 = new Student("沙和尚");
+            Student student4 = new Student("白龙马");
+            Student student5 = new Student("潮涌");
+
+            student1.PrintInfo();
+            student2.PrintInfo();
+            student3.PrintInfo();
+            student4.PrintInfo();
+            student5.PrintInfo();
+
+
+            Student.Teacher = "嫦娥姐姐";
+
+            student1.PrintInfo();
+            student2.PrintInfo();
+            student3.PrintInfo();
+            student4.PrintInfo();
+            student5.PrintInfo();
+        }
+    }
+}
diff --git "a/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232/\350\245\277\346\270\270\350\256\2602.cs" "b/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232/\350\245\277\346\270\270\350\256\2602.cs"
new file mode 100644
index 0000000000000000000000000000000000000000..fa882b5d65cc515819ed59e093a600319e515731
--- /dev/null
+++ "b/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232/\350\245\277\346\270\270\350\256\2602.cs"
@@ -0,0 +1,27 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace zbxa
+{
+    internal class d5
+    {
+        public string Name { get; set; }
+
+        public static string Teacher { get; set; }
+
+
+        public d5(string name)
+        {
+            this.Name = name;
+
+        }
+
+        public void Print()
+        {
+            Console.WriteLine($"大家好,我是{Name},俺老师是{Teacher}");
+        }
+    }
+}
diff --git "a/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\344\270\211\346\254\241\344\275\234\344\270\232/\345\237\272\347\241\200\350\257\255\346\263\225\345\267\251\345\233\2723.cs" "b/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\344\270\211\346\254\241\344\275\234\344\270\232/\345\237\272\347\241\200\350\257\255\346\263\225\345\267\251\345\233\2723.cs"
new file mode 100644
index 0000000000000000000000000000000000000000..cca4357dbcd5fe66d987230677b654024f67d0a6
--- /dev/null
+++ "b/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\344\270\211\346\254\241\344\275\234\344\270\232/\345\237\272\347\241\200\350\257\255\346\263\225\345\267\251\345\233\2723.cs"
@@ -0,0 +1,252 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace zb
+{
+    internal class Program
+    {   
+        static void Main(string[] args)
+        {
+            Console.WriteLine("请输入圆的半径:");
+            double r = Convert.ToDouble(Console.ReadLine());
+            Console.WriteLine("圆的面积是:" + (3.14 * r * r));
+            Console.WriteLine();
+
+            /*---------------------------------------------*/
+
+            Console.WriteLine("请输入一个四位数");
+            int i = Convert.ToInt32(Console.ReadLine());
+            Console.WriteLine("千位数:" + (i / 1000) + "百位数:" + (i % 1000 / 100) + "十位数:" + (i % 100 / 10) + "个位数" + (i % 10));
+            Console.WriteLine();
+
+            /*---------------------------------------------*/
+
+            int i1, i2, i3;
+            Console.WriteLine("请输入三个数");
+            i1 = Convert.ToInt32(Console.ReadLine());
+            i2 = Convert.ToInt32(Console.ReadLine());
+            i3 = Convert.ToInt32(Console.ReadLine());
+            Console.WriteLine("最大的数是:" + ((i1 > i2 ? i1 : i2) > i3 ? (i1 > i2 ? i1 : i2) : i3));
+            Console.WriteLine();
+
+            /*---------------------------------------------*/
+
+            Console.WriteLine("请输入一个数");
+            i = 1;
+            for (int x = Convert.ToInt32(Console.ReadLine()); x > 0; x--)
+            {
+                i = i * x;
+            }
+            Console.WriteLine("它的乘阶是:" + i);
+            Console.WriteLine();
+
+            /*---------------------------------------------*/
+
+            Console.WriteLine("请输入一个数");
+            i = 1; i1 = 0;
+            for (int x = Convert.ToInt32(Console.ReadLine()); x > 0; x--)
+            {
+                for (int x1 = x; x1 > 0; x1--)
+                {
+                    i = i * x1;
+                }
+                i1 = i1 + i;
+                i = 1;
+            }
+            Console.WriteLine("它所有的乘阶和是:" + i1);
+            Console.WriteLine();
+
+            /*---------------------------------------------*/
+
+            Console.WriteLine("请输入边长");
+            int y = Convert.ToInt32(Console.ReadLine());
+            for (i = 1; i <= y; i++)
+            {
+                for (int j = 1; j <= y - i; j++)
+                {
+                    Console.Write(" ");
+                }
+                for (int k = 1; k <= 2 * i - 1; k++)
+                {
+                    Console.Write("*");
+                }
+                Console.WriteLine();
+            }
+            for (i = y - 1; i >= 1; i--)
+            {
+                for (int j = 1; j <= y - i; j++)
+                {
+                    Console.Write(" ");
+                }
+                for (int k = 1; k <= 2 * i - 1; k++)
+                {
+                    Console.Write("*");
+                }
+                Console.WriteLine();
+            }
+            Console.WriteLine();
+            /*---------------------------------------------*/
+
+            int[,] a = { { 1, 1 }, { 2, 2 }, { 3, 3 }, { 4, 4 }, { 5, 5 },
+                { 6, 6 }, { 7,7},{8,8},{9,9}};
+            for (i = 0; i <= 8; i++)
+            {
+                for (int j = 0; j <= i; j++)
+                {
+                    Console.Write(a[j, 1] + "*" + a[i, 1] + "=" + (a[j, 1] * a[i, 1]) + "  ");
+                    if (j == 1 && (i == 3 || i == 2)) { Console.Write(" "); }
+                }
+                Console.WriteLine();
+            }
+            Console.WriteLine();
+
+            /*---------------------------------------------*/
+
+            Console.WriteLine("请输入一串字符");
+            i3 = 0; i1 = 0; i2 = 0;
+            string s = Console.ReadLine();
+            char[] c = s.ToCharArray();
+            int i4 = s.Length;
+            for (i = 0; i < i4; i++)
+            {
+                if (c[i] >= '0' && c[i] <= '9') { i1++; }
+                else if (c[i] >= 'a' && c[i] <= 'z' || c[i] >= 'A' && c[i] <= 'Z') { i2++; }
+                else { i3++; }
+            }
+            Console.WriteLine($"输入的字符有{i1}个数字，{i2}个字母，{i3}其他字符");
+            Console.WriteLine();
+
+            /*---------------------------------------------*/
+
+            Console.WriteLine("请输入五个学生的成绩");
+            double[] cj = new double[5]; double c1 = 0;
+            for (i = 0; i <= 4; i++)
+            {
+                cj[i] = Convert.ToDouble(Console.ReadLine());
+                c1 = c1 + cj[i];
+            }
+            Console.WriteLine("五位同学的平均成绩为" + (c1 / 5.0));
+            Console.WriteLine();
+
+            /*---------------------------------------------*/
+
+            int[] b = { 1, 3, 56, 12, 34, 2 };
+            for (i = 0; i < b.Length; i++)
+            {
+                bool m = false;
+                for (i1 = 0; i1 < b.Length - 1; i1++)
+                {
+                    if (b[i1] > b[i1 + 1])
+                    {
+                        m = true;
+                        i2 = b[i1];
+                        b[i1] = b[i1 + 1];
+                        b[i1 + 1] = i2;
+                    }
+                }
+                if (!m) { break; }
+            }
+            for (i = 0; i < b.Length; i++)
+            {
+                Console.Write($"{b[i]}  ");
+            }
+            Console.WriteLine();
+            Console.WriteLine();
+
+
+            /*---------------------------------------------*/
+
+
+            for (i = 0; i < b.Length; i++)
+            {
+                Console.Write($"{b[i]}  ");
+            }
+            Console.WriteLine("请输入要查询的数");
+            i = Convert.ToInt32(Console.ReadLine());
+            for (i1 = 0; i1 < b.Length; i1++)
+            {
+                if (i == b[i1])
+                {
+                    Console.WriteLine("它的下标为" + i1);
+                }
+            }
+            Console.WriteLine();
+
+            /*---------------------------------------------*/
+
+            for (i = 0; i < b.Length; i++)
+            {
+                Console.Write($"{b[i]}  ");
+            }
+            Console.WriteLine();
+            Console.Write("其中偶数是");
+            for (i1 = 0; i1 < b.Length; i1++)
+            {
+                if (b[i1] % 2 == 0)
+                {
+                    Console.Write(i1 + " ");
+                }
+            }
+            Console.WriteLine();
+            Console.WriteLine();
+
+            /*---------------------------------------------*/
+
+            Console.WriteLine("请输入正方形的边长");
+            i = Convert.ToInt32(Console.ReadLine());
+            for (i1 = 1; i1 <= i; i1++)
+            {
+                for (i2 = 1; i2 <= i; i2++)
+                {
+                    Console.Write("* ");
+                }
+                Console.WriteLine();
+            }
+            Console.WriteLine();
+
+            /*---------------------------------------------*/
+
+            Console.WriteLine("请输入正方形的边长");
+            i = Convert.ToInt32(Console.ReadLine());
+            for (i1 = 1; i1 <= i; i1++)
+            {
+                for (i2 = 1; i2 <= i; i2++)
+                {
+                    if (i1 == 1 || i1 == i)
+                    {
+                        Console.Write("* ");
+                    }
+                    else if (i2 == 1 || i2 == i)
+                    {
+                        Console.Write("* ");
+                    }
+                    else { Console.Write("  "); }
+                }
+                Console.WriteLine();
+            }
+            Console.WriteLine();
+
+            /*---------------------------------------------*/
+
+            int[,] array = new int[10, 10];
+            for (i = 0; i < 10; i++)
+            {
+                for (int j = 0; j <= i; j++)
+                {
+                    if (j == 0 || i == j)
+                    {
+                        array[i, j] = 1;
+                    }
+                    else
+                    {
+                        array[i, j] = array[i - 1, j - 1] + array[i - 1, j];
+                    }
+                    Console.Write(array[i, j].ToString() + " ");
+                }
+                Console.WriteLine();
+            }
+    }
+}
diff --git "a/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\344\272\214\346\254\241\344\275\234\344\270\232/\345\237\272\347\241\200\350\257\255\346\263\225\345\267\251\345\233\2721.cs" "b/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\344\272\214\346\254\241\344\275\234\344\270\232/\345\237\272\347\241\200\350\257\255\346\263\225\345\267\251\345\233\2721.cs"
new file mode 100644
index 0000000000000000000000000000000000000000..03b37731b17be0b6ea8d6355c89a8e8a7c09051d
--- /dev/null
+++ "b/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\344\272\214\346\254\241\344\275\234\344\270\232/\345\237\272\347\241\200\350\257\255\346\263\225\345\267\251\345\233\2721.cs"
@@ -0,0 +1,69 @@
+using System;
+
+namespace 基础语法
+{
+    internal class Program
+    {
+        static void Main(string[] args)
+        {
+            Console.WriteLine("真是天上降魔主");
+            Console.WriteLine("如同人间太岁神");
+            Console.WriteLine("这个贾克斯");
+            Console.WriteLine("牛");
+            Console.WriteLine("逼");
+            Console.WriteLine("--------------------");
+            bool s1=true;
+            bool s2=false;
+            Console.WriteLine("s1"+s1);
+            Console.WriteLine("s2"+s2);
+            Console.WriteLine("--------------------");
+            byte a1 = 0;
+            byte a2 = 255;
+            Console.WriteLine("a1"+a1);
+            Console.WriteLine("a2"+a2);
+            short b1 = 3;
+            short b2 = 4;
+            Console.WriteLine("b1"+b1);
+            Console.WriteLine("b2"+b2);
+            int c1 = 5;
+            int c2 = 6;
+            Console.WriteLine("c1"+c1);
+            Console.WriteLine("c2"+c2);
+            long d1 = 7;
+            long d2 = 8;
+            Console.WriteLine("d1"+d1);
+            Console.WriteLine("d2"+d2);
+            Console.WriteLine("--------------------");
+            float e1 = -3.14f;
+            float e2 = 3.14f;
+            Console.WriteLine("e1"+e1);
+            Console.WriteLine("e2"+e2);
+            double f1 = -3.14;
+            double f2 = 3.14;
+            Console.WriteLine("f1"+f1);
+            Console.WriteLine("f2"+f2);
+            Console.WriteLine("--------------------");
+            int a = 10;
+            int b = 20;
+            Console.WriteLine("a:" + a);
+            Console.WriteLine("b" + b);
+            int temp = a;
+            a = b;
+            b = temp;
+            Console.WriteLine("a"+a);
+            Console.WriteLine("b"+b);
+            Console.WriteLine("-------------------");
+            int x = 100, y = 200;
+            int add = x + y;
+            int sub = x - y;
+            int mul = x * y;
+            int div=x / y;
+            Console.WriteLine("-------------------");
+            double x1 = 100.8, y1 = 20.6;
+            double add1 = x1 + y1;
+            double sub1= x1 - y1;
+            double mul1 = x * y1;
+            double div1 = x / y1;
+        }
+    }
+}
diff --git "a/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\344\272\214\346\254\241\344\275\234\344\270\232/\345\237\272\347\241\200\350\257\255\346\263\225\345\267\251\345\233\2722.cs" "b/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\344\272\214\346\254\241\344\275\234\344\270\232/\345\237\272\347\241\200\350\257\255\346\263\225\345\267\251\345\233\2722.cs"
new file mode 100644
index 0000000000000000000000000000000000000000..4163e232b45f8711137da194eba04efe686f6d3d
--- /dev/null
+++ "b/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\344\272\214\346\254\241\344\275\234\344\270\232/\345\237\272\347\241\200\350\257\255\346\263\225\345\267\251\345\233\2722.cs"
@@ -0,0 +1,72 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace lx1
+{
+    internal class Program
+    {
+        static void Main(string[] args)
+        {
+            Console.WriteLine("请输入一个字符：");
+            int a1=Convert.ToInt32(Console.ReadLine());
+            if (a1>=0&&a1<=9)
+            {
+                Console.WriteLine("该字符为数字字符");
+            }
+            else
+            {
+                Console.WriteLine("该字符不是数字字符");
+            }
+
+            Console.WriteLine("请输入一个字符：");
+            char a2=char.Parse(Console.ReadLine());
+            if ((a2 >= 'A' && a2 <='Z')||(a2>='a' && a2<='z'))
+            {
+                Console.WriteLine("该字符是字母字符");
+            }
+            else
+            {
+                Console.WriteLine("该字母不是字母字符");
+            }
+
+            Console.WriteLine("输入年份：");
+            int a3=Int32.Parse(Console.ReadLine());
+            if ((a3 %4==0 && a3% 100!=0)||(a3 %400==0))
+            {
+                Console.WriteLine("该年份为闰年");
+            }
+            else
+            {
+                Console.WriteLine("该年份不是闰年");
+            }
+
+            Console.WriteLine("请输入三位数字");
+            int a4=Convert.ToInt32(Console.ReadLine());
+            int b1=a4/100;
+            int b2=a4/10%10;
+            int b3=a4%10;
+            if (a4==(b1*b1*b1+b2*b2*b2+b3*b3*b3))
+            {
+                Console.WriteLine($"{a4}是水仙花数");
+            }
+            else
+            {
+                Console.WriteLine($"{a4}不是水仙花数");
+            }
+
+            Console.WriteLine("请输入一个五位数：");
+            int a5=Convert.ToInt32(Console.ReadLine());
+            int c1=a5/10000;
+            int c2=a5/1000%10;
+            int c3=a5/10%10; 
+            int c4=a5%10;
+            if (c1==c4 && c2 ==c3)
+            {
+                Console.WriteLine($"{a5}是回文数");
+            }
+        }
+    }
+}
diff --git "a/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\344\272\224\346\254\241\344\275\234\344\270\232/Book.cs" "b/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\344\272\224\346\254\241\344\275\234\344\270\232/Book.cs"
new file mode 100644
index 0000000000000000000000000000000000000000..00d323469f2eeadbc979b12a3c0fb6eb8d7479d5
--- /dev/null
+++ "b/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\344\272\224\346\254\241\344\275\234\344\270\232/Book.cs"
@@ -0,0 +1,28 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace 第四次作业
+{
+    internal class Book
+    {
+        private int id;
+        private string name;
+        private double price;
+        private string press;
+
+        public int Id { get => id; set => id = value; }
+        public string Name { get => name; set => name = value; }
+        public double Price { get => price; set { if (price >= 0) { price = value; } else { price = 0;} } }
+        public string Press { get => press; set => press = value; }
+
+        public void book() {
+            Console.WriteLine("书籍编号"+id);
+            Console.WriteLine("书籍名称"+name);
+            Console.WriteLine("书籍价格"+price);
+            Console.WriteLine("出版社"+press);
+        }
+    }
+}
diff --git "a/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\344\272\224\346\254\241\344\275\234\344\270\232/Program.cs" "b/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\344\272\224\346\254\241\344\275\234\344\270\232/Program.cs"
new file mode 100644
index 0000000000000000000000000000000000000000..86f8d6ffd4946dac0ddd3c14d4e0620060376434
--- /dev/null
+++ "b/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\344\272\224\346\254\241\344\275\234\344\270\232/Program.cs"
@@ -0,0 +1,37 @@
+using Microsoft.Win32;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace ConsoleApp1
+{
+    internal class Program
+    {
+        static void Main(string[] args)
+        {
+            Console.WriteLine("用户信息：");
+            User user = new User();
+            user.Id = 1;
+            user.name = "LOL";
+            user.Password = "123456";
+            user.Print();
+            Console.WriteLine("学生信息");
+            Student student = new Student();
+            student.id = 1;
+            student.Name = "小张";
+            student.Sex = '男';
+            student.Age = 19;
+            student.Print();
+            Console.WriteLine("书籍信息");
+            Book book = new Book();
+            book.id = 137;
+            book.name = "c#面向对象";
+            book.Price = 39;
+            book.Press = "清华大学出版社";
+            book.Print();
+            Console.ReadKey();
+        }
+    }
+}
diff --git "a/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\344\272\224\346\254\241\344\275\234\344\270\232/Student.cs" "b/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\344\272\224\346\254\241\344\275\234\344\270\232/Student.cs"
new file mode 100644
index 0000000000000000000000000000000000000000..3efbe6dfaac3a82a3037735a424f4adeea85d905
--- /dev/null
+++ "b/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\344\272\224\346\254\241\344\275\234\344\270\232/Student.cs"
@@ -0,0 +1,28 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace 第四次作业
+{
+    internal class Student
+    {
+        private int id;
+        private string name;
+        private int age;
+        private char sex;
+
+        public int Id { get => id; set => id = value; }
+        public string Name { get => name; set => name = value; }
+        public int Age { get => age; set { if (age >= 0 && age <= 128) { age = value; } else { age = 0; } } }
+        public char Sex { get => sex; set => sex = value; }
+
+        public void student() { 
+            Console.WriteLine("编号：" + Id);
+            Console.WriteLine("姓名：" + Name);
+            Console.WriteLine("性别：" + Sex);
+            Console.WriteLine("年龄：" + Age);
+        }
+    }
+}
diff --git "a/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\344\272\224\346\254\241\344\275\234\344\270\232/User.cs" "b/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\344\272\224\346\254\241\344\275\234\344\270\232/User.cs"
new file mode 100644
index 0000000000000000000000000000000000000000..32cfdf49149df6d969ca5fccc4566e94223704d8
--- /dev/null
+++ "b/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\344\272\224\346\254\241\344\275\234\344\270\232/User.cs"
@@ -0,0 +1,21 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace 第四次作业
+{
+    internal class Class2
+    {
+        public int id;
+        public string name;
+        public int password;
+
+        public void Print() {
+          Console.WriteLine($"账号为{id}");
+          Console.WriteLine($"用户名为{name}");
+          Console.WriteLine($"密码为{password}");
+        }
+    }
+}
diff --git "a/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\345\205\253\346\254\241\344\275\234\344\270\232/\345\255\246\347\224\237/school.cs" "b/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\345\205\253\346\254\241\344\275\234\344\270\232/\345\255\246\347\224\237/school.cs"
new file mode 100644
index 0000000000000000000000000000000000000000..3c5318df7f1c01ff72c8291c6d9417a72318b3bc
--- /dev/null
+++ "b/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\345\205\253\346\254\241\344\275\234\344\270\232/\345\255\246\347\224\237/school.cs"
@@ -0,0 +1,32 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace zbxa
+{
+    internal class Program
+    {
+        static void Main(string[] args)
+        {
+            student student= new student();
+            student.id = 1;
+            student.name = "张标";
+            student.sex = '男';
+            student.cardid = "123456";
+            student.tel = 123456;
+            student.major = "软件技术";
+            student.grade= 1;
+
+            teacher teacher = new teacher();
+            teacher.id = 2;
+            teacher.name = "谢老师";
+            teacher.sex = '女';
+            teacher.cardid = "2";
+            teacher.tel= 3;
+            teacher.title = "职称";
+            teacher.wageno = 1231;
+        }
+    }
+}
diff --git "a/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\345\205\253\346\254\241\344\275\234\344\270\232/\345\255\246\347\224\237/student.cs" "b/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\345\205\253\346\254\241\344\275\234\344\270\232/\345\255\246\347\224\237/student.cs"
new file mode 100644
index 0000000000000000000000000000000000000000..046c16aa4946917dc34e52fddb510052155fc7b3
--- /dev/null
+++ "b/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\345\205\253\346\254\241\344\275\234\344\270\232/\345\255\246\347\224\237/student.cs"
@@ -0,0 +1,30 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace zbxa
+{
+    internal class student
+    {
+        public int id { get; set; }
+        public string name { get; set; }
+        public char sex { get; set; }
+        public string cardid { get; set; }
+        public int tel { get; set; }
+        public string major { get; set; }
+        public int grade { get; set; }
+
+        public void print () {
+            Console.WriteLine($"编号：{id}");
+            Console.WriteLine($"姓名：{name}");
+            Console.WriteLine($"性别：{sex}");
+            Console.WriteLine($"身份证号：{cardid}");
+            Console.WriteLine($"联系方式：{tel}");
+
+            Console.WriteLine($"专业：{major}");
+            Console.WriteLine($"年级：{grade}");
+        }
+    }
+}
diff --git "a/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\345\205\253\346\254\241\344\275\234\344\270\232/\345\255\246\347\224\237/teacher.cs" "b/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\345\205\253\346\254\241\344\275\234\344\270\232/\345\255\246\347\224\237/teacher.cs"
new file mode 100644
index 0000000000000000000000000000000000000000..7cb66e6dba2033ddc2637ab7cbea48578d731c68
--- /dev/null
+++ "b/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\345\205\253\346\254\241\344\275\234\344\270\232/\345\255\246\347\224\237/teacher.cs"
@@ -0,0 +1,26 @@
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace zbxa
+{
+    internal class teacher : student
+    {
+        public string title { get; set;}
+        public double wageno { get; set;}
+
+        public void print() {
+            Console.WriteLine($"编号：{id}");
+            Console.WriteLine($"姓名：{name}");
+            Console.WriteLine($"性别：{sex}");
+            Console.WriteLine($"身份证号：{cardid}");
+            Console.WriteLine($"联系方式：{tel}");
+
+            Console.WriteLine($"职称：{title}");
+            Console.WriteLine($"工资号：{wageno}");
+        }
+    }
+}
diff --git "a/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\345\205\253\346\254\241\344\275\234\344\270\232/\346\270\270\346\210\217/Erok.cs" "b/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\345\205\253\346\254\241\344\275\234\344\270\232/\346\270\270\346\210\217/Erok.cs"
new file mode 100644
index 0000000000000000000000000000000000000000..8fc04046be8c10041f2defb5dc9be8233a4f2170
--- /dev/null
+++ "b/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\345\205\253\346\254\241\344\275\234\344\270\232/\346\270\270\346\210\217/Erok.cs"
@@ -0,0 +1,16 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Program2
+{
+    internal class Erok:heros
+    {
+        public void print() {
+
+          base.print();
+        }
+    }
+}
diff --git "a/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\345\205\253\346\254\241\344\275\234\344\270\232/\346\270\270\346\210\217/Lucas.cs" "b/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\345\205\253\346\254\241\344\275\234\344\270\232/\346\270\270\346\210\217/Lucas.cs"
new file mode 100644
index 0000000000000000000000000000000000000000..c85d546a15ffa6a5bd14a26b70ef9ace445d21a2
--- /dev/null
+++ "b/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\345\205\253\346\254\241\344\275\234\344\270\232/\346\270\270\346\210\217/Lucas.cs"
@@ -0,0 +1,15 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Program2
+{
+    internal class Lucas:heros
+    {
+        public void print() { 
+        base.print();
+        } 
+    }
+}
diff --git "a/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\345\205\253\346\254\241\344\275\234\344\270\232/\346\270\270\346\210\217/Program.cs" "b/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\345\205\253\346\254\241\344\275\234\344\270\232/\346\270\270\346\210\217/Program.cs"
new file mode 100644
index 0000000000000000000000000000000000000000..611ae38c8956e8d502051d9e9cb3ab639200cfe7
--- /dev/null
+++ "b/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\345\205\253\346\254\241\344\275\234\344\270\232/\346\270\270\346\210\217/Program.cs"
@@ -0,0 +1,56 @@
+using System;
+
+namespace Program2
+{
+    internal class Program
+    {
+        static void Main(string[] args)
+        {
+            System.Console.WriteLine("请输入你的大名：");
+            string a = Console.ReadLine();
+
+            Erok erok= new Erok();
+            erok.a= a;
+            erok.name = "埃洛克";
+            erok.introduce = "埃洛克是一名极其痛恨牛头人的狂战士，他是爱情的捍卫者，是末日第一深情，是舔狗猎杀者。" +
+                "有关他的传说数不胜数，最为标志性的是他头上的牛角，那是某次不为人知的战斗战利品。" +
+                "倘若仔细看还能隐隐看到牛角盔下的盈盈绿光";
+            erok.sobriquet = "纯爱战神";
+            erok.ATK = 99.9;
+            erok.velocity = 66;
+            erok.defense = 66.6;
+            erok.skill1 = "纯爱打击";
+            erok.skill2 = "绿光锚钩";
+            erok.skill3 = "被牛咆哮";
+            erok.print();
+
+            Thera thera = new Thera();
+            thera.a = a;
+            thera.name = "泰拉";
+            thera.introduce = "末日第一女拳家，对男性角色伤害超级加倍，引战速度极快，闻着味就来，是极强极其难缠的角色，但是极容易破防。";
+            thera.sobriquet = "女拳斗士";
+            thera.ATK = 999;
+            thera.velocity = 999;
+            thera.defense = 1;
+            thera.skill1 = "家人们，谁懂啊！";
+            thera.skill2 = "权利掠夺";
+            thera.skill3 = "责任抛弃";
+            thera.print();
+
+            Lucas lucas=new Lucas();
+            lucas.a = a;
+            lucas.name = "卢卡斯";
+            lucas.introduce="落魄贵族卢卡斯，被斗X苍穹毒害的年轻一代。坚信三十年河东三十年河西，我命由我不由天，但是是个无业游民，至今还没找到自己的贴身老爷爷。";
+            lucas.sobriquet = "消炎";
+            lucas.ATK = 1;
+            lucas.velocity =99 ;
+            lucas.defense =99999;
+            lucas.skill1 = "莫欺少年穷";
+            lucas.skill2 = "莫欺中年穷";
+            lucas.skill3 = "莫欺老年穷";
+            lucas.print();
+
+
+        }
+    }
+}
diff --git "a/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\345\205\253\346\254\241\344\275\234\344\270\232/\346\270\270\346\210\217/RPG.cs" "b/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\345\205\253\346\254\241\344\275\234\344\270\232/\346\270\270\346\210\217/RPG.cs"
new file mode 100644
index 0000000000000000000000000000000000000000..f018ca4fa925946a982d87de5f611963e1e2e74b
--- /dev/null
+++ "b/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\345\205\253\346\254\241\344\275\234\344\270\232/\346\270\270\346\210\217/RPG.cs"
@@ -0,0 +1,15 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Program2
+{
+    internal class Thera:heros
+    {
+        public void print() { 
+        base .print();
+        }
+    }
+}
diff --git "a/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\345\205\253\346\254\241\344\275\234\344\270\232/\346\270\270\346\210\217/heros.cs" "b/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\345\205\253\346\254\241\344\275\234\344\270\232/\346\270\270\346\210\217/heros.cs"
new file mode 100644
index 0000000000000000000000000000000000000000..83d0aba54ce90c80f3e6d5698f4c7c4c6fc82c2b
--- /dev/null
+++ "b/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\345\205\253\346\254\241\344\275\234\344\270\232/\346\270\270\346\210\217/heros.cs"
@@ -0,0 +1,36 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Program2
+{
+    internal class heros
+    {
+        //角色名字，角色介绍，角色昵称，攻击力，防御力，速度
+        public string a;
+        public string name { get; set; }
+        public string introduce { get; set; } 
+        public string sobriquet { get; set; }
+        public double ATK { get; set; }
+        public double velocity { get; set; }
+        public double defense { get; set; }
+
+        public string skill1 { get; set; }
+        public string skill2 { get; set; }
+        public string skill3 { get; set; }
+
+        public void print(){
+            Console.WriteLine($"阁下的大名："+a);
+            Console.WriteLine($"名字：{name}");
+            Console.WriteLine($"介绍：{introduce}");
+            Console.WriteLine($"昵称：{sobriquet}");
+            Console.WriteLine($"攻击：{ATK}");
+            Console.WriteLine($"速度：{velocity}");
+            Console.WriteLine($"防御：{defense}");
+            Console.WriteLine($"技能;"+skill1+"\t"+skill2+"\t"+skill3);
+        }
+
+    }
+}
diff --git "a/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\345\205\255\346\254\241\344\275\234\344\270\232/Class1.cs" "b/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\345\205\255\346\254\241\344\275\234\344\270\232/Class1.cs"
new file mode 100644
index 0000000000000000000000000000000000000000..df034c00c5be60e0b8e0542584a815965435230c
--- /dev/null
+++ "b/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\345\205\255\346\254\241\344\275\234\344\270\232/Class1.cs"
@@ -0,0 +1,69 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace zbxa
+{
+    internal class Class1
+    {
+        public static bool IsEmpty(int[] arr)
+        {
+            if (arr == null || arr.Length == 0)
+            {
+                return true;
+            }
+            else
+            {
+                return false;
+            }
+        }
+
+        public static bool IsEmpty(double[] arr)
+        {
+            if (arr == null || arr.Length == 0)
+            {
+                return true;
+            }
+            else
+            {
+                return false;
+            }
+        }
+        public static bool IsEmpty(float[] arr)
+        {
+            if (arr == null || arr.Length == 0)
+            {
+                return true;
+            }
+            else
+            {
+                return false;
+            }
+        }
+        public static bool IsEmpty(string[] arr)
+        {
+            if (arr == null || arr.Length == 0)
+            {
+                return true;
+            }
+            else
+            {
+                return false;
+            }
+        }
+        public static bool IsEmpty(char[] arr)
+        {
+            if (arr == null || arr.Length == 0)
+            {
+                return true;
+            }
+            else
+            {
+                return false;
+
+            }
+        }
+    }
+}
diff --git "a/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\345\205\255\346\254\241\344\275\234\344\270\232/Class2.cs" "b/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\345\205\255\346\254\241\344\275\234\344\270\232/Class2.cs"
new file mode 100644
index 0000000000000000000000000000000000000000..6e95ada18686a47df57c9f2db2d2a856e0ec5420
--- /dev/null
+++ "b/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\345\205\255\346\254\241\344\275\234\344\270\232/Class2.cs"
@@ -0,0 +1,28 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace zbxa
+{
+    internal class Class2
+    {
+        public static bool IsEmpty(string str)
+        {
+            if (str == null || str == "")
+            {
+                return false;
+            }
+            char[] chars = str.ToCharArray();
+            for (int i = 0; i < chars.Length; i++)
+            {
+                if (chars[i] != ' ')
+                {
+                    return false;
+                }
+            }
+            return true;
+        }
+    }
+}
diff --git "a/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\345\205\255\346\254\241\344\275\234\344\270\232/Class3.cs" "b/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\345\205\255\346\254\241\344\275\234\344\270\232/Class3.cs"
new file mode 100644
index 0000000000000000000000000000000000000000..2a8345383d7e1d1d21fc2a3446935773982510d4
--- /dev/null
+++ "b/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\345\205\255\346\254\241\344\275\234\344\270\232/Class3.cs"
@@ -0,0 +1,22 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace zbxa
+{
+    internal class Class3
+    {
+        public static void S(double r, double g, double b)
+        {
+            double s = r * g * b;
+            Console.WriteLine("圆的面积：" + s);
+        }
+        public static void Rec(int x, int y)
+        {
+            int rec = x * y;
+            Console.WriteLine("长方形的面积：" + rec);
+        }
+    }
+}
diff --git "a/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\345\215\201\344\270\200\346\254\241\344\275\234\344\270\232/\346\263\233\345\236\213\351\233\206\345\220\210/Program.cs" "b/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\345\215\201\344\270\200\346\254\241\344\275\234\344\270\232/\346\263\233\345\236\213\351\233\206\345\220\210/Program.cs"
new file mode 100644
index 0000000000000000000000000000000000000000..8bdf336d24948e9e9993134be01cb88bcb146462
--- /dev/null
+++ "b/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\345\215\201\344\270\200\346\254\241\344\275\234\344\270\232/\346\263\233\345\236\213\351\233\206\345\220\210/Program.cs"
@@ -0,0 +1,15 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace ConsoleApp2
+{
+    internal class Program
+    {
+        static void Main(string[] args)
+        {
+        }
+    }
+}
diff --git "a/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\345\215\201\344\270\200\346\254\241\344\275\234\344\270\232/\346\263\233\345\236\213\351\233\206\345\220\210/St.cs" "b/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\345\215\201\344\270\200\346\254\241\344\275\234\344\270\232/\346\263\233\345\236\213\351\233\206\345\220\210/St.cs"
new file mode 100644
index 0000000000000000000000000000000000000000..840225e33de50585f0baec1cf5217b968be938a1
--- /dev/null
+++ "b/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\345\215\201\344\270\200\346\254\241\344\275\234\344\270\232/\346\263\233\345\236\213\351\233\206\345\220\210/St.cs"
@@ -0,0 +1,39 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace ConsoleApp2
+{
+    internal class St
+    {
+        int id;
+        string name;
+        double chinese;
+        double math;
+        double english;
+
+        public St(int id, string name, double chinese, double math, double english)
+        {
+            this.id = id;
+            this.name = name;
+            this.chinese = chinese;
+            this.math = math;
+            this.english = english;
+        }
+
+        public St() { }
+
+        public int Id { get => id; set => id = value; }
+        public string Name { get => name; set => name = value; }
+        public double Chinese { get => chinese; set => chinese = value; }
+        public double Math { get => math; set => math = value; }
+        public double English { get => english; set => english = value; }
+
+        public override string ToString()
+        {
+            return $"{id}\t{name}\t{chinese}\t{math}\t{english}";
+        }
+    }
+}
diff --git "a/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\345\215\201\344\270\211\346\254\241\344\275\234\344\270\232/\345\233\276\344\271\246\347\256\241\347\220\206\347\263\273\347\273\237/Program.cs" "b/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\345\215\201\344\270\211\346\254\241\344\275\234\344\270\232/\345\233\276\344\271\246\347\256\241\347\220\206\347\263\273\347\273\237/Program.cs"
new file mode 100644
index 0000000000000000000000000000000000000000..6bf68f9c10d76fd3f062079e12c350319237f111
--- /dev/null
+++ "b/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\345\215\201\344\270\211\346\254\241\344\275\234\344\270\232/\345\233\276\344\271\246\347\256\241\347\220\206\347\263\273\347\273\237/Program.cs"
@@ -0,0 +1,221 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Security.Cryptography.X509Certificates;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace zbxa
+{
+    internal class Program
+    {
+        static void Main(string[] args)
+        {
+            static void Menu() 
+            {
+                Console.WriteLine("1.增加图书信息");
+                Console.WriteLine("2.删除图书信息");
+                Console.WriteLine("3.修改图书信息");
+                Console.WriteLine("4.查询图书信息");
+                Console.WriteLine("5.退出");
+                Console.WriteLine("..................");
+            }
+
+
+            static void QueryMenu() 
+            {
+                Console.WriteLine("1.查询所以图书信息");
+                Console.WriteLine("2.按价查询图书信息");
+                Console.WriteLine("3.按作者查询图书信息");
+                Console.WriteLine("4.按编号查询巴拉巴拉");
+                Console.WriteLine("5.退出");
+            }
+
+         public static void  AddBook(List<book>list)
+            {
+                book book = new book();
+                Console.WriteLine("请输入图书编号");
+                book.Id = Convert.ToInt32(Console.ReadLine());
+
+                Console.WriteLine("请输入图书名：");
+                book.Name = Console.ReadLine();
+
+                Console.WriteLine("请输入图书价格：");
+                book.Price = Convert.ToDouble(Console.ReadLine());
+
+                Console.WriteLine("请输入图书作者：");
+                book.Author = Console.ReadLine();
+
+                list.Add(book);
+                Console.WriteLine("添加成功");
+            }
+
+            public static void RemoveBook(List<book> list)
+            {
+                Console.WriteLine("请输入你要删除的图书的编号：");
+                int id = Convert.ToInt32(Console.ReadLine());
+
+                for (int i = 0; i < list.Count; i++)
+                {
+                    if (list[i].Id == id)
+                    {
+                        list.Remove(list[i]);
+                        Console.WriteLine("删除成功");
+                        return;
+                    }
+                }
+                Console.WriteLine("删除失败，找不到该图书");
+            }
+
+
+            private static void Modify(List<book> list)
+            {
+                Console.WriteLine("请输入要修改图书信息的编号：");
+                int id = int.Parse(Console.ReadLine());
+                foreach (book bookInfo in list)
+                {
+                    if (bookInfo.Id == id)
+                    {
+                        Console.WriteLine("修改后的图书名：");
+                        string name = Console.ReadLine();
+                        Console.WriteLine("修改后的图书价格：");
+                        double price = double.Parse(Console.ReadLine());
+                        Console.WriteLine("修改后的图书作者信息：");
+                        string author = Console.ReadLine();
+                        Console.WriteLine("修改成功");
+                        return;
+                    }
+                }
+
+            }
+
+            private static void QueryMenu(List<book> list)
+            {
+                while (true)
+                {
+                    QueryMenu(list);
+                    Console.WriteLine("请输入你的选择：");
+                    int select = int.Parse(Console.ReadLine());
+                    switch (select)
+                    {
+                        case 
+                            printInfo(list);
+                            break;
+                        case 
+                            Console.WriteLine("请输入图书价格来查询：");
+                            double price = double.Parse(Console.ReadLine());
+                            priceTable(list, price);
+                            break;
+
+                        case 
+                            Console.WriteLine("请输入要查找的图书的名字：");
+                            string name = Console.ReadLine();
+                            LikeName(list, name);
+                            break;
+                        case 
+                            Console.WriteLine("请输入要查找图书的编号：");
+                            int id = int.Parse(Console.ReadLine());
+                            IdPrint(list, id);
+                            break;
+                        case;
+
+                            break;
+                        default:
+                            Console.WriteLine("请重新输入");
+                            break;
+                    }
+                    if (select == 5)
+                    {
+                        break;
+                    }
+                }
+            }
+
+            private static void IdPrint(List<book> list, int id)
+            {
+                foreach (book book in list)
+                {
+                    if (book.Id == id)
+                        Console.WriteLine("找到该图书");
+                }
+
+            }
+
+            private static void priceTable(List<book> list, double price)
+            {
+                foreach (book book list)
+                {
+                    if (book.Price == price)
+                    {
+                        Console.WriteLine("找到了该图书");
+                    }
+                    else
+                    {
+                        Console.WriteLine("不存在该图书");
+                    }
+                }
+            }
+
+            private static void LikeName(List<book> list, string? name)
+            {
+                foreach (book book in list)
+                {
+                    if (book.Name == name)
+                    {
+                        Console.WriteLine(book);
+                    }
+                }
+            }
+
+            public static void Main(string[] args)
+            {
+                List<book> list = new List<book>();
+
+                while (true)
+                {
+                    Menu();
+                    Console.WriteLine("请输入你的选择：");
+                    int select = int.Parse(Console.ReadLine());
+                    switch (select)
+                    {
+                        case 
+                            AddBook(list);
+                            printInfo(list);
+                            break;
+
+                        case
+                            RemoveBook(list);
+                            printInfo(list);
+                            break;
+
+                        case 
+                            Modify(list);
+                            printInfo(list);
+                            break;
+
+                        case 
+                            QueryMenu();
+                            break;
+
+                        case
+                            Environment.Exit(0);
+                            break;
+
+                        default:
+                            Console.WriteLine("选择错误，请重新输入");
+                            break;
+                    }
+                }
+
+            }
+            public static void printInfo(List<book> list)
+            {
+                Console.WriteLine("图书编号\t图书名\t图书价格\t图书作者");
+
+                for (int i = 0; i < list.Count; i++)
+                {
+                    Console.WriteLine(list[i]);
+                }
+            }
+    }
+}
diff --git "a/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\345\215\201\344\270\211\346\254\241\344\275\234\344\270\232/\345\233\276\344\271\246\347\256\241\347\220\206\347\263\273\347\273\237/book.cs" "b/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\345\215\201\344\270\211\346\254\241\344\275\234\344\270\232/\345\233\276\344\271\246\347\256\241\347\220\206\347\263\273\347\273\237/book.cs"
new file mode 100644
index 0000000000000000000000000000000000000000..1175e22982efa0366fb242cc77a59fe754fb96a1
--- /dev/null
+++ "b/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\345\215\201\344\270\211\346\254\241\344\275\234\344\270\232/\345\233\276\344\271\246\347\256\241\347\220\206\347\263\273\347\273\237/book.cs"
@@ -0,0 +1,35 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace zbxa
+{
+    internal class book
+    {
+        int id;
+        string name;
+        double price;
+        string author;
+
+        public int Id { get => id; set => id = value; }
+        public string Name { get => name; set => name = value; }
+        public double Price { get => price; set => price = value; }
+        public string Author { get => author; set => author = value; }
+    
+        public book() { }
+        public book(int id, string name, double price, string author)
+        {
+            Id = id;
+            Name = name;
+            Price = price;
+            Author = author;
+        }
+
+        public override string ToString()
+        {
+            return $"{id}\t{name}\t{price}\t{author}";
+        }
+    }
+}
diff --git "a/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\345\215\201\346\254\241\344\275\234\344\270\232/\345\244\232\346\200\201(1)/Calculate.cs" "b/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\345\215\201\346\254\241\344\275\234\344\270\232/\345\244\232\346\200\201(1)/Calculate.cs"
new file mode 100644
index 0000000000000000000000000000000000000000..fab4a2f050b570feea81b3b64a9eebc3113e9f61
--- /dev/null
+++ "b/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\345\215\201\346\254\241\344\275\234\344\270\232/\345\244\232\346\200\201(1)/Calculate.cs"
@@ -0,0 +1,20 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace duot
+{
+    internal class Calculate
+    {
+        protected int num1;
+        protected int num2;
+        protected Calculate(int num1,int num2)
+        {
+            this.num1 =num1;
+            this.num2 =num2;
+        }
+        public virtual void DisplayResult() { }
+    }
+}
diff --git "a/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\345\215\201\346\254\241\344\275\234\344\270\232/\345\244\232\346\200\201(1)/Program.cs" "b/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\345\215\201\346\254\241\344\275\234\344\270\232/\345\244\232\346\200\201(1)/Program.cs"
new file mode 100644
index 0000000000000000000000000000000000000000..6c2b1395abe4800da1ceec6f73ee4a188ee3722e
--- /dev/null
+++ "b/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\345\215\201\346\254\241\344\275\234\344\270\232/\345\244\232\346\200\201(1)/Program.cs"
@@ -0,0 +1,39 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Security.Cryptography.X509Certificates;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace duot
+{
+    internal class Program
+    {
+        static void Main(string[] args)
+        {
+            Console.WriteLine("请分别输入两个整数");
+            int num1=Convert.ToInt32(Console.ReadLine());
+
+            int num2=Convert.ToInt32(Console.ReadLine());
+
+            Calculate calculate = new Calculate(num1,num2);
+            Console.WriteLine("请输入操作符：");
+            string z=Console.ReadLine();
+            switch (z)
+            {
+                case "+":
+                    jia jia = new jia(num1, num2);
+                    Run(jia);
+                    break;
+                case "-":
+                    jian jian = new jian(num1, num2);
+                    Run(jian);
+                    break;
+            }
+        }
+        public static void Run(Calculate calculate)
+        {
+            calculate.DisplayResult();
+        }
+    }
+}
diff --git "a/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\345\215\201\346\254\241\344\275\234\344\270\232/\345\244\232\346\200\201(1)/jia.cs" "b/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\345\215\201\346\254\241\344\275\234\344\270\232/\345\244\232\346\200\201(1)/jia.cs"
new file mode 100644
index 0000000000000000000000000000000000000000..7757947022492e630e7c61aae70786cc74f41807
--- /dev/null
+++ "b/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\345\215\201\346\254\241\344\275\234\344\270\232/\345\244\232\346\200\201(1)/jia.cs"
@@ -0,0 +1,17 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace duot
+{
+    internal class jia:Calculate
+    {
+        public jia(int num1, int num2):base(num1, num2){}
+        public override void DisplayResult()
+        {
+            Console.WriteLine($"{num1}+{num2}={num2+num1}");
+        }
+    }
+}
diff --git "a/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\345\215\201\346\254\241\344\275\234\344\270\232/\345\244\232\346\200\201(1)/jian.cs" "b/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\345\215\201\346\254\241\344\275\234\344\270\232/\345\244\232\346\200\201(1)/jian.cs"
new file mode 100644
index 0000000000000000000000000000000000000000..32270a7a4739663ed16cacb18dc7b924851699d4
--- /dev/null
+++ "b/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\345\215\201\346\254\241\344\275\234\344\270\232/\345\244\232\346\200\201(1)/jian.cs"
@@ -0,0 +1,18 @@
+using System;
+using System.Collections.Generic;
+using System.Diagnostics.PerformanceData;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace duot
+{
+    internal class jian:Calculate
+    {
+        public jian(int num1,int num2):base(num1,num2) { }
+        public override void DisplayResult()
+        {
+            Console.WriteLine($"{num1}-{num2}={num1-num2}");
+        }
+    }
+}
diff --git "a/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\345\215\201\346\254\241\344\275\234\344\270\232/\345\244\232\346\200\201(2)/Circle.cs" "b/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\345\215\201\346\254\241\344\275\234\344\270\232/\345\244\232\346\200\201(2)/Circle.cs"
new file mode 100644
index 0000000000000000000000000000000000000000..bc1c6609a59117ce5ce12bfbd26dc73176e22939
--- /dev/null
+++ "b/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\345\215\201\346\254\241\344\275\234\344\270\232/\345\244\232\346\200\201(2)/Circle.cs"
@@ -0,0 +1,22 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace ConsoleApp1
+{
+    internal class Circle:Shape
+    {
+        double radius;
+        public Circle(double radius) 
+        {
+           this.radius = radius;
+        }
+
+        public override double GetArea()
+        {
+            return 3.14+radius*radius;
+        }
+    }
+}
diff --git "a/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\345\215\201\346\254\241\344\275\234\344\270\232/\345\244\232\346\200\201(2)/Program.cs" "b/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\345\215\201\346\254\241\344\275\234\344\270\232/\345\244\232\346\200\201(2)/Program.cs"
new file mode 100644
index 0000000000000000000000000000000000000000..9711eb16a75c937fa0b3bf4c0db6cda875427707
--- /dev/null
+++ "b/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\345\215\201\346\254\241\344\275\234\344\270\232/\345\244\232\346\200\201(2)/Program.cs"
@@ -0,0 +1,27 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Security.Permissions;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace ConsoleApp1
+{
+    internal class Program
+    {
+        static void Main(string[] args)
+        {
+            Circle circle = new Circle(12);
+            circle.color = "五彩斑斓的黑";
+            PrintArea(circle);
+
+            Square square= new Square(2);
+            square.color = "black";
+            PrintArea(square);
+        }
+        public static void PrintArea(Shape shape)
+        {
+            Console.WriteLine(shape.GetArea());
+        }
+    }
+}
diff --git "a/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\345\215\201\346\254\241\344\275\234\344\270\232/\345\244\232\346\200\201(2)/Shape.cs" "b/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\345\215\201\346\254\241\344\275\234\344\270\232/\345\244\232\346\200\201(2)/Shape.cs"
new file mode 100644
index 0000000000000000000000000000000000000000..0bc96e4c16e5b48316642e8bcf997814bbcb4c80
--- /dev/null
+++ "b/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\345\215\201\346\254\241\344\275\234\344\270\232/\345\244\232\346\200\201(2)/Shape.cs"
@@ -0,0 +1,14 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace ConsoleApp1
+{
+    internal class Shape
+    {
+        public string color { get; set; }
+        public abstract double GetArea() ;
+    }
+}
diff --git "a/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\345\215\201\346\254\241\344\275\234\344\270\232/\345\244\232\346\200\201(2)/Square.cs" "b/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\345\215\201\346\254\241\344\275\234\344\270\232/\345\244\232\346\200\201(2)/Square.cs"
new file mode 100644
index 0000000000000000000000000000000000000000..29fd6a2b218bbdbd1032e539afb1765c488bd386
--- /dev/null
+++ "b/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\345\215\201\346\254\241\344\275\234\344\270\232/\345\244\232\346\200\201(2)/Square.cs"
@@ -0,0 +1,24 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace ConsoleApp1
+{
+    internal class Square:Shape
+    {
+        double side;
+        public double sid { get { return side ; }set { side = value; } }
+        public Square() { }
+        public Square(double side)
+        {
+            this.side = side ;
+        }
+
+        public override double GetArea()
+        {
+            return side*side ;
+        }
+    }
+}
diff --git "a/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\345\233\233\346\254\241\344\275\234\344\270\232/RPG.cs" "b/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\345\233\233\346\254\241\344\275\234\344\270\232/RPG.cs"
new file mode 100644
index 0000000000000000000000000000000000000000..ad93639e7fd510bbf7422228246f64eae19e3ef5
--- /dev/null
+++ "b/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\345\233\233\346\254\241\344\275\234\344\270\232/RPG.cs"
@@ -0,0 +1,45 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace RPG
+{
+    internal class Program
+    {
+        enum RPG
+        {
+            战士,
+            法师,
+            精灵
+        }
+        static void Main(string[] args)
+        {
+            for (int i = 1; i >= 0; i++)
+            {
+                Console.WriteLine("选择你的职业\n1.战士\n2.法师\n3.精灵");
+                int r = (int)(RPG)Convert.ToInt32(Console.ReadLine());
+                if ((int)r == 1)
+                {
+                    Console.WriteLine($"职业：{r}\n技能：碎石打击、烈焰锚钩、战斗咆哮");
+                    break;
+                }
+                else if ((int)r == 2)
+                {
+                    Console.WriteLine($"职业：{r}\n技能：巨浪冲击、元素突击、复仇杀戮");
+                    break;
+                }
+                else if ((int)r == 3)
+                {
+                    Console.WriteLine($"职业：{r}\n技能：减速陷阱、能量浪潮、旋风剑舞");
+                    break;
+                }
+                else
+                {
+                    Console.WriteLine($"选择错误，重新选择");
+                }
+            }
+        }
+    }
+}
diff --git "a/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\345\233\233\346\254\241\344\275\234\344\270\232/\346\260\264\346\236\234.cs" "b/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\345\233\233\346\254\241\344\275\234\344\270\232/\346\260\264\346\236\234.cs"
new file mode 100644
index 0000000000000000000000000000000000000000..af257c5057000767b0a13fc84e54ddb83b507671
--- /dev/null
+++ "b/49\345\274\240\346\240\207\346\230\237\345\256\211/\347\254\254\345\233\233\346\254\241\344\275\234\344\270\232/\346\260\264\346\236\234.cs"
@@ -0,0 +1,33 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace 水果
+{
+    internal class Program
+    {
+        enum Fruit
+        {
+            葡萄,                                                                                                 ,
+            草莓,
+            奇异果,
+            苹果,
+            香蕉,
+            哈密瓜,
+            西瓜
+        }
+        static void Main(string[] args)
+        {
+            Random f = new Random();
+            for (int i = 0; i < 10; i++)
+            {
+                Random random = new Random();
+                int command = random.Next();
+                Console.WriteLine((Fruit)command + "水果分数为" + (command + 1));
+            }
+            Console.WriteLine("游戏结束");
+        }
+    }
+}