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+# 1.使用switch 和 if 语句解决出租车车费问题
+
+```java
+public class jf {
+    public static void main(String[] args) {
+    int xl =3,fk =4,stn =5;
+        System.out.println("请输入车型");
+        Scanner sc3 = new Scanner(System.in);
+          int cx = sc3.nextInt();
+    switch(cx) {
+        case 1:
+            System.out.println("请输入千米数");
+            Scanner scanner = new Scanner(System.in);
+            double a = scanner.nextInt();
+            if (a > 3) {
+            double cf = xl + 2.1 * a;
+                System.out.println("费用为："+cf+"元");
+                
+            }
+            else{
+                System.out.println("费用为："+xl+"元");
+            }
+            break;
+        case 2:
+            System.out.println("请输入千米数");
+            Scanner sc = new Scanner(System.in);
+            double b = sc.nextInt();
+            if (b > 3) {
+               double cf1 = fk + 2.4 * b;
+                System.out.println("费用为:"+cf1+"元");
+            } else{
+                System.out.println("费用为："+fk+"元");
+            }
+            break;
+        case 3:
+            System.out.println("请输入千米数");
+            Scanner sc1 = new Scanner(System.in);
+            double c = sc1.nextInt();
+            if (c > 3) {
+                double cf2 = stn + 2.7 * c;
+                System.out.println("费用为："+cf2);
+
+            } else{
+                System.out.println("费用为："+stn+"元");
+            }
+            break;
+    }
+
+        }
+    }
+```
+
+# 2.扩展作业
+
+1.
+
+```java
+import java.util.Scanner;
+
+public class iy {
+    public static void main(String[] args) {
+        int days = 0;
+        System.out.println("请输入年份");
+        Scanner scanner = new Scanner(System.in);
+        int year = scanner.nextInt();
+        System.out.println("请输入月份");
+        int month = scanner.nextInt();
+        System.out.println("请输入日");
+        int day = scanner.nextInt();
+        switch (month){
+            case 12:
+                days = day;
+            case 11:
+                days += 31;
+            case 10:
+                days += 30;
+            case 9:
+                days += 31;
+            case 8:
+                days += 31;
+            case 7:
+                days += 30;
+            case 6:
+                days +=31;
+            case 5:
+                days += 30;
+            case 4:
+                days += 31;
+            case 3:
+                days += 31;
+            case 2:
+                   if (year % 4 ==0){
+                    days += 29;
+                } else{
+                    days += 28;
+                }
+            case 1:
+                days += 31;
+        }
+        System.out.println(year +"年"+month +"月"+day +"日"+"是今年的第"+days +"天");
+    }
+}
+```
+
+
+
+2.
+
+```java
+import java.util.Scanner;
+
+public class po {
+    public static void main(String[] args) {
+        System.out.println("请输入一个字符：");
+        Scanner scanner = new Scanner(System.in);
+        char x = scanner.next().charAt(0);
+        switch (x){
+            case 'a':
+            case 'A':
+            case 'e':
+            case 'E':
+            case 'i':
+            case 'I':
+            case 'o':
+            case 'O':
+            case 'u':
+            case 'U':
+                System.out.println("这是韵母");
+                break;
+            default:
+            System.out.println("这是声明");
+        }
+         if(x == 97-221){
+             System.out.println("这是大写字母");
+         } else{
+             System.out.println("这是小写字母");
+         }
+
+    }
+}
+```
+