commandLine.cpp

#include <iostream>
#include <string>
using namespace std;

int main(int argc, char*argv[]) {
	if (argc != 2) {
		cerr << "Invalid nummber of arguments" << endl;	
		return 1;
	}
	string choice = argv[1];
	string best = "best";
	string worst = "worst";

	if (choice.compare(best) == 0) {
		cout << "BEST" << endl;	
	} else if (choice.compare(worst) == 0) {
		cout << "WORST" << endl;	
	} else {
		cout << "You didn't pick an algorithm" << endl;
		return 1;	
	}
	
	int n;
	bool validInput = false;
	
	while (!validInput || n!=5) {
		cout << "Enter 1-5" << endl;
		cin >> n;
		if (cin.fail()) {
			cin.clear();
			cin.ignore(256, '\n');
			validInput = false;		
		}
		if (n>=1 && n<=5) {
			validInput = true;
			cout << "Do option(" << n << ")" << endl;		
		}
		else {
			cout << "Input invalid" << endl;
			validInput = false;		
		}
	
	}

}