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+```
+import java.util.Scanner;
+
+public class czc {
+/*    private static final char 夏利 =1;
+    private static final char 富康 = 2;
+    private static final char 桑塔纳 = 3;*/
+
+
+    public static void main(String[] args) {
+        Scanner sc = new Scanner(System.in);
+        System.out.println("请输入车型");
+        int num= sc.nextInt();
+        System.out.println("请输入路程");
+        double Num = sc.nextDouble();
+        switch (num){
+            case 1:
+                if (Num<=3){
+                    System.out.println(+Num*3);
+                }
+                if (Num>3){
+                    System.out.println((Num-3)*2.1+9);
+                }
+                break;
+            case 2:
+                if (Num<=3){
+                    System.out.println(Num*4);
+                }
+                if (Num>3){
+                    System.out.println((Num-3)*2.4+12);
+                }
+                break;
+            case 3:
+                if (Num<=3){
+                    System.out.println(Num*5);
+                }
+                if (Num>3){
+                    System.out.println((Num-3)*2.7+15);
+                }
+                break;
+            default:
+                System.out.println("输入错误");
+                break;
+
+        }
+    }
+    }
+```
+
+```
+import java.util.Scanner;
+
+public class tian {
+    public static void main(String[] args) {
+        Scanner sc = new Scanner(System.in);
+
+        System.out.println("请输入年份");
+        int year = sc.nextInt();
+        System.out.println("请输入月份");
+        int Num = sc.nextInt();
+        System.out.println("请输入日份");
+        int num = sc.nextInt();
+        switch (year){
+            case 2000:
+            if(year%4==0&&year%400!=0||year%400==0){
+                System.out.println(year+"是闰年");
+            }
+                if(Num >= 3){
+                System.out.println((Num-1)*30+num+1);
+            }
+            System.out.println((Num-1)*30+num);
+        }
+    }
+}
+```
+
+
+
+```
+import java.util.Scanner;
+//a o e i u v
+public class zimu {
+    public static void main(String[] args) {
+        Scanner sc = new Scanner(System.in);
+        System.out.println("请输入一个字符");
+        char num = sc.next().charAt(0);
+        switch (num){
+            case 'a':
+            case 'A':
+            case 'e':
+            case 'E':
+            case 'i':
+            case 'I':
+            case 'o':
+            case 'O':
+            case 'u':
+            case 'U':
+            case 'v':
+            case 'V':
+                    System.out.println("这是韵母");
+                    break;
+            default:
+                    System.out.println("这是声母");
+
+
+        }
+        if(num>='A'&& num<='Z'){
+        System.out.println("大写字母");
+        } else {
+            System.out.println("小写字母");
+        }
+    }
+}
+```
+
+## 3. 流程控制语句
+
+在一个程序执行的过程中，各条语句的执行顺序对程序的结果是有直接影响的。所以，我们必须清楚每条语句的执行流程。而且，很多时候要通过控制语句的执行顺序来实现我们想要的功能。
+
+### 3.1 流程控制语句分类(了解)
+
+​	顺序结构
+
+​	分支结构(if, switch)
+
+​	循环结构(for, while, do…while)
+
+### 3.2 顺序结构(了解)
+
+顺序结构是程序中最简单最基本的流程控制，没有特定的语法结构，按照代码的先后顺序，依次执行，程序中大多数的代码都是这样执行的。
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