// Guess A Number : C++
#include "stdafx.h"
#include <iostream>
#include <sstream>
#include <string>
#include <algorithm>
#include <time.h>
#include <exception>

using std::stringstream;
using std::cout;
using std::cin;
using std::endl;
using std::string;
using std::transform;
using std::exception;

bool IsAnInt(string input)
{
	try
	{
		int output = atoi(input.c_str());
		return true;
	}
	catch (exception &ex)
	{
		return false;
	}
}
int GetNumericInput(string prompt)
{
	while (true)
	{
		cout << prompt << ": ";
		string ans;
		cin >> ans;
		if (IsAnInt(ans)) return atoi(ans.c_str());
		cout << "Your entry was not a number." << endl;
	}
}
string GetInput(string question)
{
	while (true)
	{
		cout << question << "?" << endl;
		string ans;
		cin >> ans;
		if (!ans.empty()) return ans;
		cout << "Your entry seems empty." << endl;
	}
}
bool AskToPlayAgain()
{
	while (true)
	{
		string ans = GetInput("Would you like to play again? (\"YES\" or \"NO\")");
		transform(ans.begin(), ans.end(), ans.begin(), ::toupper);
		if (ans == "YES" || ans == "Y") return true;
		if (ans == "NO" || ans == "N") return false;
		cout << "Please respond with \"YES\" or \"NO\"." << endl;
	}
}
void Run()
{
	srand(time_t(0));
	bool Running = true;
	bool GotMaxNumber = false;
	int MaxNumber = 0;
	int Answer = 0;
	bool GameOver = false;
	int Tries = 0;
	cout << "*** GUESS A NUMBER : C++ ***" << endl;
	while (Running)
	{
		while (!GotMaxNumber)
		{
			MaxNumber = GetNumericInput("Please enter the maximum number you wish to use");
			if (MaxNumber > 0)
			{
				GotMaxNumber = true;
				Answer = rand() % MaxNumber;
				GameOver = false;
				Tries = 0;
				cout << "Ok, I am thinking of a number between 1 and " << MaxNumber << "." << endl;
			}
			else
				cout << "The maximum number should be greater than zero." << endl;
		}
		stringstream ss;
		ss << MaxNumber;
		string strMaxNumber = ss.str();
		int Guess = GetNumericInput("Guess a number between 1 and " + strMaxNumber);
		Tries++;
		if (Guess > Answer) cout << "Too high." << endl;
		if (Guess < Answer) cout << "Too low." << endl;
		if (Guess == Answer)
		{
			GameOver = true;
			cout << "You got it in " << Tries << " ";
			if (Tries == 1) cout << "try!";
			else cout << "tries!";
			cout << endl;
		}
		if (GameOver)
		{
			Running = AskToPlayAgain();
			if (Running) GotMaxNumber = false;
		}
	}
	cout << "Thanks for playing!" << endl << "*** GAME OVER ***" << endl;
}

int _tmain(int argc, _TCHAR* argv[])
{
	Run();
	return 0;
}