1.revers in function

#include<stdio.h>
int revers (int n)
{    int  r=0;
    while (n!=0)
    {
        r=r*10;
        r=r+n%10;
        n=n/10;
    }
    return r;
}
int main ()
{
    int n,ans;
    scanf("%d",&n);
    ans=revers(n);
    printf("%d",ans);
    return 0;
}