007_Reverse_Integer.c

int reverse(int x) 
{
  int rev = 0;
  while(x)
  {
    int digit = x % 10;
    x /= 10;
    if((rev > INT_MAX / 10) || (rev < INT_MIN/10) || (rev == INT_MAX/10 && digit > 7) || (rev == INT_MIN/10 && digit < -8))
      return 0;
    rev = rev*10 + digit;
  }
  return rev;
}