int sum2(int a, int b)
{
  int c = 0;

  if(a < b)
    while(b >= a){
      c = c + b;
      b--;
    }

  return c;
}

/* original
int sum2(int a, int b)
{
  int c = 0;

  if(a < b)
    while(b >= a){
      c = c + b;
      b = b--;
    }

  return c;
}
*/
