WAP in C++ to check whether the inputed integer is automorphic or not

In Mathematics an automorphic number (sometimes referred to as a circular number) is a number whose square ends in the same digits as number itself.
For example, 5² = 25, 76² = 5776

#include<iostream.h>

#include<conio.h>

void main()
{
int n, d;
long sq;
cout << "\n Enter a Number :";
cin >> n ;
sq =(long) n * n ;
int  y, r;
long x = sq;
y = n;
while(y!=0)
{
r= y%10;
d = (int) (x%10);
x = x/10;
y = y/10;
if(r ! =  d)
cout << " \ n NOT an Automorphic Number.";
getch();
exit(1);
}
cout << " \ n an Automorphic Number.";getch();


}