rev-int.c

/*********************
 * Resolução do problema: https://leetcode.com/problems/reverse-integer/
 *********************/

int aux_rev(int x, long long int rev)
{
  if(rev > INT_MAX || rev < INT_MIN) return 0;
  if(!x)                             return rev;

  return aux_rev(x/10, rev*10 + x%10);
}

int reverse(int x)
{
  return aux_rev(x, 0);
}