/*  Write a function that takes two numbers and returns if they 
 *  should be added, subtracted, multiplied or divided to get 24. 
 *  If none of the operations can give 24, return "Invalid".
 *  a change.
 */
std::string operation(int num1, int num2) {
	std::string result = "Invalid";
		if (num1 + num2 == 24) {
			result = "added";
		} 
		else if ((num1 - num2 == 24) || (num2 - num1 == 24)) {
			result = "subtracted";
		} 
		else if (num1 * num2 == 24) {
			result = "multiplied"; 
		} 
		else if (((0 != num2) && (num1 / num2 == 24)) || ((0 != num1) && (num2 / num1 == 24))) {
			result = "divided"; 
	  }
	return result;
}