char *compare(int i1, int i2)
{
     if (i1 > i2) return "first";
     else if (i2 > i1) return "second";
     else return "equal";     
}
int  diff (int i1, int i2)
{
      return (i1-i2);
}
int  sum (int i1, int i2)
{
      return (i1+i2);
}