public static void main(String[] args) {
		/*When an argument is passed in through the main method it will call on the calculate method and pass in the same argument. The 
		 * argument passed in will be validated by the calculate method and will output the appropriate error message if the argument 
		 * passed in is invalid. The arguments are case sensitive.
		 */
		calculate(args[0]); //<--this is the calculate method that takes in the parameter passed through the main method
	}