随机产生30组四则运算

通过函数产生随机数,然后随机生成加减乘除运算并输出

#include<iostream>

#include<ctime>

using namespace std;

void main()

{

    int a,b,c;

    srand(unsigned(time(NULL)));

    for(int i=0;i<30;i++)

    {

        a=rand()%99+1;

        b=rand()%99+1;

        c=rand()%4+1;

        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 4:cout<<a<<"/"<<b<<"="<<endl;break;

        }

    }

}