if选择结构

 1 package struct;
 2 
 3 import java.util.Scanner;
 4 
 5 public class IfDemo01 {
 6     public static void main(String[] args) {
 7         Scanner scanner = new Scanner(System.in);
 8 
 9         System.out.println("情输入内容：");
10         String s = scanner.nextLine();
11         //equals:判断字符串是否相等
12         if ( s.equals("hello")){
13             System.out.println(s);
14         }
15         System.out.println("End!");
16         scanner.close();
17     }
18 }

 1 package struct;
 2 
 3 import java.util.Scanner;
 4 
 5 public class IfDemo02 {
 6     public static void main(String[] args) {
 7         //考核分数大于60就及格，小于60就不及格
 8         Scanner scanner = new Scanner(System.in);
 9 
10         System.out.println("请输入成绩：");
11         int score = scanner.nextInt();
12         if (score>60){
13             System.out.println("及格！");
14         }else{
15             System.out.println("不及格！");
16         }
1

 1 package struct;
 2 
 3 import java.util.Scanner;
 4 
 5 public class IfDemo03 {
 6     public static void main(String[] args) {
 7         Scanner scanner = new Scanner(System.in);
 8         System.out.println("请输入成绩：");
 9         int score  = scanner.nextInt();
10         if (score==100){
11             System.out.println("恭喜满分!");
12         }else if(score < 100 && score >= 90){
13             System.out.println("A级");
14         }else if(score < 90 && score >= 80){
15             System.out.println("B级");
16         }else if(score < 80 && score >= 70){
17             System.out.println("C级");
18         }else if(score < 70 && score >= 60) {
19             System.out.println("D级");
20         }else if(score < 60 && score >=0 ){
21             System.out.println("不及格!");
22         }else{
23             System.out.println("成绩不合法！");//102
24         }
25     }
26 }

posted on 2022-07-18 17:03 一枚努力学习的小白阅读(16) 评论(0) 编辑收藏举报