struct-IfDemo01-03

package com.kuang.struct;

import java.util.Scanner;
//=====================
//Demo01
//=====================
public class IfDemo01 {
    public static void main(String[] args) {


        Scanner scanner = new Scanner(System.in);

        System.out.println("请输入内容:");
        String s = scanner.nextLine();

        //equals: 判断字符串是否相等
        if(s.equals("Hello")){
            System.out.println(s);
        }
        System.out.println("End");

        scanner.close();
    }
}

package com.kuang.struct;

import java.util.Scanner;
//=====================
//Demo02
//=====================
public class IfDemo02 {
    public static void main(String[] args) {

        //考试分数大于60分就是及格,小于60分就不及格.

        Scanner scanner = new Scanner(System.in);

        System.out.println("请输入成绩:");
        int score = scanner.nextInt();

        if(score>=60){
            System.out.println("及格");
        }else {
            System.out.println("不及格");
        }


        scanner.close();
    }
}

package com.kuang.struct;

import java.util.Scanner;
//=====================
//Demo03
//=====================
public class IfDemo03 {
    public static void main(String[] args) {
        //考试分数大于60分就是及格,小于60分就不及格.

        Scanner scanner = new Scanner(System.in);

        System.out.println("请输入成绩:");
        int score = scanner.nextInt();

        if(score==100){
            System.out.println("恭喜满分");
        }else if (score<100 && score>=90){
            System.out.println("A级");
        }else if (score<90 && score>=80){
            System.out.println("B级");
        }else if (score<80 && score>=70){
            System.out.println("C级");
        }else if (score<70 && score>=60){
            System.out.println("D级");
        }else if (score<60 && score>=0){
            System.out.println("不及格");
        }else {
            System.out.println("成绩不合法");
        }


        scanner.close();
    }
}