C++ code to learn tables

Once I was just anyhow wanted to learn tables till 25 to quicken up my calculations, so I wrote this piece of code in C++. I already knew till 10, so I skipped.

#include<stdio.h>
#include<conio.h>
#include<iostream>

using namespace std;

int main()
{
    int i,j,ans;
    cout<<"Welcome to TABLE learning....!!!!\n\n";
    while(1)
    {
           i=rand()%15+10;
           j=rand()%9+2;
           cout<<i<<" x "<<j<<" = ";
           cin>>ans;
           if(ans==i*j)
           cout<<"good..\n\n";
           else
           cout<<"ans is ... "<<i*j<<"  try again...!!!\n\n";
    }

    getch();
    return 0;
}