From 6216fc55a2665e2d0df59777e96d3f0893129cfd Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E8=B7=AF=E7=8E=B2?= <1516489926@qq.com>
Date: Wed, 21 Dec 2022 00:51:04 +0800
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@@ -0,0 +1,155 @@
+### 作业
+
+Arrays.toString()打印
+
+continue;跳过
+
+1.编写函数，计算圆的面积和周长，在主函数中接受圆的半径，在自定义函数中计算并输出
+
+```java
+
+import java.util.Scanner;
+
+public class ON11 {
+    public static void main(String[] args) {
+        Scanner sc = new Scanner(System.in);
+        System.out.println("请输入圆的半径");
+        int a = sc.nextInt();
+         double b =area(a);
+        System.out.println("圆的面积是："+b);
+        double c = perimeter(a);
+        System.out.println("圆的周长是："+c);
+
+    }
+    public static double area(int a){
+        double w =3.14*a;
+        return w;
+    }
+    public static double perimeter(int a){
+        double p =3.14*a*a;
+        return p ;
+    }
+}
+```
+
+2.在主函数中产生20个0-10之间的随机数，将这20个随机数存入数组，并通过函数计算某个数在这些随机数中出现的次数（这“某个数”是在主函数中由用户输入的）
+
+```java
+import java.util.Random;
+import java.util.Scanner;
+
+public class ON12 {
+    public static void main(String[] args){
+        int[] a = new int[20];
+        for (int n = 0; n < 20; n++) {
+            Random ran = new Random();
+            a[n] = ran.nextInt(10);
+        }
+
+            Scanner sc = new Scanner(System.in);
+            System.out.println("请输入数字(1-10):");
+            int b = sc.nextInt();
+            sum(a,b);}
+            public static void sum(int[] a,int b){
+            int count = 0;
+            for (int i = 0;i<a.length;i++){
+                if (b==a[i]){
+                    count++;
+                }
+            }
+            System.out.println("这个数一共重复了" + count + "次");
+
+        }
+```
+
+3.在主函数中接收10个数存入数组，在自定义函数中，将该数组中的最大值与第一个元素交换，最小值与最后一个元素交换，然后在主函数中输出交换后的数组
+
+```java
+import java.util.Arrays;
+
+public class ON13 {
+    public static void main(String[] args) {
+        int[] arr = {45, 2, 32, 14, 65, 46, 57, 18, 29, 91};
+        System.out.println(Arrays.toString((arr)));
+        num(arr);
+    }
+
+    public static void num(int[] arr) {
+        int min = arr[0];
+        for (int k = 0; k < arr.length; k++) {
+            if (min > arr[k]) {
+                min = arr[0];
+            }
+        }
+        int max = arr[0];
+        for (int i = 1; i < arr.length; i++) {
+            if (max < arr[i]) {
+                max = arr[9];
+            }
+        }
+        arr[0]=max;
+        arr[9]=min;
+        System.out.print("[");
+        for (int p = 0; p < arr.length; p++) {
+            System.out.print(arr[p]);
+            if (p==arr.length-1){
+                continue;
+            }
+            System.out.print(".");
+        }
+        System.out.print("]");
+    }
+}
+```
+
+4.用自定义函数是实现求某数组元素的和（大小不固定）
+
+```java
+import java.util.Scanner;
+
+public class ON14 {
+    public static void main(String[] args) {
+        Scanner sc = new Scanner(System.in);
+        System.out.println("请输入数组的长度（一定要是整数）：");
+        int[] arr = new int[sc.nextInt()];
+        for (int k =0; k<arr.length;k++){
+            System.out.println("请输入第"+(k+1)+"数字");
+            arr[k]= sc.nextInt();
+        }
+        sum(arr);
+
+    }
+        public static void sum(int[] arr){
+        int num =0;
+        for (int i =0;i<arr.length;i++){
+            num+=arr[i];
+        }
+            System.out.println("数组的和为："+num);
+```
+
+5.用户输入整数n，计算1!+(1!+2!)+(1!+2!+3!)+…..+(1!+2!+…n!)
+
+```java
+
+import java.util.Scanner;
+
+public class NO15 {
+    public static void main(String[] args) {
+        Scanner sc =new Scanner(System.in);
+        System.out.println("请输入数字（数字一定为整数）：");
+        int n = sc.nextInt();
+        sum(n);
+        System.out.println("等于："+sum(n));
+    }
+    public  static  int sum (int n){
+        int m =1;
+        for (int k =1;k<=n ;k++){
+            for (int y=0;y<k;y++){
+                m=k*y;
+            }
+        }
+        return m;
+    }
+}
+```
+
-- 
Gitee