1~100以内的质数和

package com.zhidi.loop;public class Zhishuhe {    public static void main(String[] args){        int sum=0;        int a;        int b;        for(a=1;a<=100;a++){            for(b=2;b<=a;b++){                if(a%b==0&&a!=b){                    break;                }else if(a%b==0&&a==b){                    sum+=a;                }            }        }        System.out.println(sum);    }}