java【第三课 条件语句】

一.java条件语句

import java.util.Scanner;  //导入扫描仪

public class demo{
     public static void main(String[] args){
         Scanner data = new Scanner(System.in);
         
         System.out.println("请输入成绩:");
         int grade = data.nextInt();

         if(grade>60){
            System.out.println("恭喜进阶!");
         }
         else{
             System.out.println("还是继续学习!");
         }
         System.out.println("测试阶段");

   
    }
}

二.switch语句

  

import java.util.Scanner;  //导入扫描仪


public class demo{
     public static void main(String[] args){
         Scanner data = new Scanner(System.in);
         
         System.out.println("请输入成绩:");
         int grade = data.nextInt();
         char rating = ' ';
         //成绩分支
         if(grade>0 && grade<45){
               rating = 'H';
         }
         else if(grade > 45 && grade <60)
         {
                 rating = 'G';
         }
         else if(grade >60 && grade <75){
              rating = 'F';
         }
         else if(grade >75 && grade <90){
              rating = 'E';
         }
         else if(grade >90 && grade <105){
              rating = 'D';
         }
         else if(grade >105 && grade <120)
         {
             rating = 'C';
         }
         else if(grade >120 && grade <135){
             rating = 'B';
         }
         else{
             rating = 'A';
         }

         //匹配等级
         switch(rating){
             case 'A':
                 System.out.println("等级A");
                 break;
             case 'B':
                 System.out.println("等级B");
                 break;
             case 'C':
                  System.out.println("等级C");
                  break;
             case 'D':
                  System.out.println("等级D");
                  break;
             case 'E':
                  System.out.println("等级E");
                  break;
             case 'F':
                  System.out.println("等级F");
                  break;
             case 'G':
                  System.out.println("等级G");
                  break;
             case 'H':
                  System.out.println("等级H");
                  break;

         }
        
          System.out.println("测试完成!");
   
    }
}

想要知道逻辑步骤:https://jingyan.baidu.com/article/ea24bc39473ff19b62b331b1.html