Reverse of number program in c

#include<stdio.h>

void main()
{

int n,r,rev=0;

printf("Enter a number");
scanf("%d",&n);

while(n!=0)
{

r=n%10;

rev=rev*10+r;

n=n/10;

}

printf("Reverse %d",rev);

}


Enter a number 786
Reverse 687