Loops Practise(Power number Program)

#include <iostream.h>
int main()
{
    long int n=0;
    long int p;
    long int a=1;
    cout <<"Enter The Number Whose Power You Want To CAlculate = ";
    cin >> n;
    cout <<"\n Enter Power = ";
    cin >> p;
    cout <<endl;
    if (p==0)
    {    a=1;
    }
    while (p>0)
    {
        a=a*n;
        p--;
    }
    cout <<" Answer Is = " << a;
    return 0;
}