小学生加减乘除

#include <iostream>
#include<ctime>
#include<stdlib.h>

using namespace std;

int main()
{
int i,panduan,a,b,sum;
char fu;
double sum2;
srand(time(0));
for(i=0;i<10;i++)
{
a=rand()%99;
b=rand()%99;

switch(rand()%4)
{
case 0:fu='+';   sum=a+b;break;
case 1:fu='-';   sum=a-b;break;
case 2:fu='*';   sum=a*b;break;
case 3:fu='/';   sum2=1.0*a/b;
}
cout <<a<<fu<<b<<'=';
cin >>panduan;
if(panduan==sum && fu!='/')
cout<<"right"<<endl;
else if(panduan==sum2 && fu=='/')
cout<<"right"<<endl;
else cout<<"wrong"<<endl;
}

return 0;
}