循环和调教判断的应用

求1~100内的奇数和

package com.alibaba.demo03;

public class Jishuhe {
    public static void main(String[] args) {
        int sum = 0;
        for(int i = 1;i<=100;i++){
            if(i%2!=0){
                System.out.println(i);
                sum+=i;
            }
        }
        System.out.println(sum);
    }
}

攒钱 break的应用

package com.alibaba.demo03;

public class cunqian {
    public static void main(String[] args) {
        float sum = 0;
        for(int i = 1;i<=1000;i++){
            sum+=2.5;
            if(i%5==0){
                sum-=6;
            }
            if(sum>=100&&sum<102){
                System.out.println("需要"+i+"天");
                break;
            }
        }
    }
}