[showcase] guess my number with difficulty level

[Soulah]

One of my assignments for class was to create a Guess my Number game using functions, passing parameters, validation, and writing to a file. I really do not use many comments in my code but I should start doing so.

Guess my Number game
- Asks user for their full name
- Asks user to set difficulty
- Asks user if they want to play
- User has five tries to guess
- Once user is finish, write to file with games played and games won with a score percentage.

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

//GUESS MY NUMBER W/FUNCTIONS BY CALL

//Prototypes
int getReply();
int getLevel();
int validateNumber(int, int);
void printResults(string, int, int);

int main()
{
//Housekeeping
	int number, guess, tries=0, level=0, upper=0, gamesPlayed=0, gamesWon=0;
	char reply;
	string playerName;
	srand((unsigned)time(0));

	cout << "State your full name please: ";
	getline(cin, playerName);
	cout << "Would you like to play the guessing game? (Y)es or (N)o? ";
	reply = getReply();
	cout << "Choose your level of difficulty (select a number from 1 to 10): ";
	level = getLevel();
	upper = level * 10;
	cout << "\nLet's play!";

	do
	{
		number=rand()%upper+1;
		gamesPlayed++;
		cout << "\n\nI am thinking of a number between 1 and " << upper << " \nCan you guess what it is? ";
		
		for(tries=5;tries>0;tries--)
		{
			cin >> guess;
			guess = validateNumber(guess, upper);
			if (guess < number)
			cout << "Your guess is low.  Try again: ";
			else if (guess > number)
			cout << "Your guess is high.  Try again: ";

			if (guess==number)
			{
				cout << "Congratulations " << playerName << "! You did it.!";
				gamesWon++;
				break;
			}
		 }
		cout << endl;

		if(guess!=number)
			cout << "Sorry " << playerName << ", The number was " << number << ".";

		cout << "\nWould you like to play again? ";
		reply = getReply();
		
	}while(reply == 'Y'); //Loop/Play again
	
	printResults(playerName, gamesPlayed, gamesWon);
	
	system("type results.txt");
    system("pause");
}

//Functions
int getReply()
{
	char answer;
	
	cin >> answer;
	answer = toupper(answer);

	while(answer != 'Y' && answer != 'N')
	{
		cin.clear();
		cin.ignore(80, '\n');
		cout << "Error: must be Y or N: ";
		cin >> answer;
		answer = toupper(answer);
	}

	cin.clear();
	cin.ignore(80, '\n');

	return answer;
}

int getLevel()
{
	int level;

	cin >> level;
	while(level < 1 || level > 10 || cin.fail())
	{
		cin.clear();
		cin.ignore(80,'\n');
		cout << "Error: number must be from 1-10: ";
		cin >>level;
	}
	return level;
}

int validateNumber(int number, int upper)
{
	while(number < 1 || number > upper || cin.fail())
	{
		cin.clear();
		cin.ignore(80,'\n');
		cout << "Error: number must be from 1-" << upper << ": ";
		cin >> number;
	}
	return number;
}

void printResults(string playerName, int gamesPlayed, int gamesWon)
{
	int percentage;
	percentage = (gamesWon/gamesPlayed)*100;

	ofstream fout("results.txt");
	if(!fout.is_open())
	{
		cout << "Error: could not find file.";
		system("pause");
		exit(666);
	}

	fout << setw(30) << left;
	fout << "Name: " << playerName;
	fout << setw(30) << right << "Score: " << percentage << "%";
	fout << endl << endl;
	fout << setw(30) << left << "Number of games played: " << gamesPlayed << endl;
	fout << setw(30) << "Number of games won: " << gamesWon << endl;
	cout << "\nAttention: saving to results.txt\n";
}