reverse a number in c++, indefinite loop

Write a program to reverse a given number.

PROGRAM

#include <iostream.h>

#include <conio.h>

void main() {

clrscr();

long int num1,num2=0,r;

cout<<"Enter number to reverse: ";

cin>>num1;

cout<<"\nThe reversed number: ";

while(num1>0) {

r=num1%10;

num2=num2*10+r;

num1=num1/10;

}

cout<<num2;

getch();

}//end of the program