30道四则运算题的第一次升级

/**
作者：程鹏远
题目：30道2年纪四则运算题目
*/
#include <iostream.h>
#include <stdlib.h>
int main()
{
    int a,b,c;
    for(int i=0;i<30;i++)
    {
        cout<<"第"<<i+1<<"题： ";
        a=rand()%100;//x+rand()%(y-x+1)随机生成【x，y】内的整数
        b=rand()%100;
        c=rand()%4;
        switch (c)
        {
        case 1:
            cout<<a<<"+"<<b<<"="<<endl;
            break;
        case 2:
            if(a>b){cout<<a<<"-"<<b<<"="<<endl;}
            else{cout<<b<<"-"<<a<<"="<<endl;}
            break;
        case 3:            
            cout<<a<<"*"<<b<<"="<<endl;
            break;
        case 0:    
            
            int j=0;
            while((j<100000)&&(a!=0)&&(b!=0)&&(a%b==0)){cout<<a<<"/"<<b<<"="<<endl;i++;j++;}
        
            if((a!=0)&&(b!=0)&&(a%b==0)){cout<<a<<"/"<<b<<"="<<endl;i++;}
            else{
                int j=0;
                while(j<100000)
                {
                    a=rand()%1000;//x+rand()%(y-x+1)随机生成【x，y】内的整数
                    b=rand()%100;
                    if((a!=0)&&(b!=0)&&(a%b==0)){cout<<a<<"/"<<b<<"="<<endl;i++;j=100000;j++;}
                    else{j++;}
                }
            }
        
            break;    
        }    
    }
    return 0;
}