reverse number

#include <stdio.h>

int main()
{
    int num,sum=0,r;
    printf("Enter any number: ");
    scanf("%d",&num);

    while(num!= 0)
    {
        r=num%10;
        sum=sum*10+r;
        num=num/10;
    }
    printf(" %d",sum);

    return 0;
    }