short int arithmetic (short int left, char operator, short int right) {

  if (operator == '+'){

    if ((left>0 && right>0)|| (left<0 && right<0 ) ) {

      if (((32767 - left) < right) ||  ( (-32767 - left) > right))  {

	printf("The result of the operation is too large to handle.\nUse -h flag for help.\n");
	exit(0);
      }
    }
    return (left+right);
  }


  if (operator == '-'){
    right = right * (-1);
    return arithmetic (left, plus, right);
  }


  if (operator == '*'){
    templ=left;
    tempr=right;

    if (left<0){
      templ=left*(-1);
    }
    if (right<0){
      tempr=right*(-1);
    }
    if ((32767/templ)<tempr){
      printf("The result of the operation is too large to handle.\nUse -h flag for help.\n");
      exit(0);
    }
    return (left*right);
  }
  if (operator == '/'){
    return (left/right);

  }

    return 0;
}