reverse a number

#include<stdio.h>
int main()
//everse a numberr
{

    int num,temp,r,sum=0;
    printf("enter any number: ");
    scanf("%d",&num);
    temp=num;
    while(temp!=0){
        r=temp%10;
        sum=sum*10+r;
        temp=temp/10;

}
   printf("reverse of numbers : %d",sum);
    return 0;
}