Java学习

第22天

求和

  public class HS_Loop1 {
     public static void main(String[] args) {
     
        int i=1,sum=0;
        
       while(i<=100){
            sum=sum+i;
            i++;
        }
        System.out.println("100以内的和："+sum);
     }

 }
求均分

import java.util.Scanner;
  
 public class HS_Loop3 {
 
     public static void main(String[] args) {
         String name;
        double sum=0,score;
         double avg=0;
         System.out.println("请输入姓名：");
         
         Scanner input= new Scanner(System.in);
         name=input.next();
        for(int i=1;i<=5;i++){
             System.out.print("请输入5门功课的第"+i+"门功课的成绩:");
             
             Scanner input2=new Scanner(System.in);
            score=input2.nextDouble();
             sum=sum+score;
         }
         avg=sum/5;
         System.out.println(name+"的平均分是:"+avg);
     }
 }

import java.util.Scanner;
 
 public class HS_Loop6 {
 
     public static void main(String[] args) {
         for(int i=1;i<10;i++){
            if(i==5){
                 System.out.println("循环提前结束");
                 break;                
             }
             System.out.println("   "+i);
         }
     }
 }