我是菜鸟···求求帮忙

#include<iostream>
using std::cout;
using std::cin;
 
int product(int, int);
 
int main()
{
   cout<<"Enter two int number: ";
   int number1, number2;
   cin>>number1>>number2;
   
   cout<<"\nThe resault is: "<<product(number1, number2);
   
   return 0;
}
 
int product(int n1, int n2)
{
   return n1*n2;
}
 

如果是两个大整数相乘的话，int类型就不能够表达，应该考虑到这一点啊！