if选择结构 

 1 package com.lin.struct;
 2 
 3 import java.util.Scanner;
 4 
 5 public class IfDemo1 {
 6     public static void main(String[] args) {
 7         Scanner scanner = new Scanner(System.in);
 8         System.out.println("请输入内容：");
 9         String s =scanner.nextLine();
10 
11         if (s.equals("Hello")){
12             System.out.println(s);
13         }else {
14             System.out.println("End");
15         }
16 
17         scanner.close();
18     }
19 }

 

 

 1 package com.lin.struct;
 2 
 3 import java.util.Scanner;
 4 
 5 public class IfDemo2 {
 6     public static void main(String[] args) {
 7         //考试分数大于60分就是及格，小于60分就不及格
 8         Scanner scanner = new Scanner(System.in);
 9         System.out.println("请输入成绩：");
10         int score = scanner.nextInt();
11         if (score>=60){
12             System.out.println("及格");
13         }else {
14             System.out.println("不及格");
15         }
16         scanner.close();
17     }
18 }

 

 

 1 package com.lin.struct;
 2 
 3 import java.util.Scanner;
 4 
 5 public class IfDemo3 {
 6     public static void main(String[] args) {
 7         Scanner scanner = new Scanner(System.in);
 8 
 9         System.out.println("请输入成绩：");
10         int score = scanner.nextInt();
11 
12         if (score==100){
13             System.out.println("恭喜满分");
14         }else if (score<100&&score>=90){
15             System.out.println("A级");
16         }else if (score<90&&score>=80){
17             System.out.println("B级");
18         }else if (score<80&&score>=60){
19             System.out.println("C级");
20         }else if (score<60&&score>=0){
21             System.out.println("成绩不及格");
22         }else {
23             System.out.println("成绩不合法");
24         }
25 
26         scanner.close();
27     }
28 }

 

 

 

posted @ 2021-02-11 15:16  奔啵儿灞  阅读(50)  评论(0)    收藏  举报