CGBS

#include "stdafx.h"
#include <iostream>
#include <string>
#include <sstream>
using namespace std;

//Simple rock, paper scissors game


//Introduction to the program
void introduction()
{
    cout << "****Rock, Paper, Scissors****" << endl << endl;
}

//Determine user's choice (rock, paper, or scissors)
int userChoice()
{
    int choice;
    string input = "";

    //ensures that response is an integer (1, 2, or 3)
    while (true)
    {
        cout << "(1) Rock" << endl << "(2) Paper" << endl << "(3) Scissors" << endl << endl << "Choose 1, 2, or 3: ";
        getline(cin, input);
        stringstream myStream(input);
        if ((myStream >> choice) && (choice >0) && (choice <4))
            break;
        cout << endl << "Invalid choice. Please try again." << endl << endl;
    }

    return choice;
}

//Determine computer's 'choice'
int cpuChoice()
{
    //Assigns randomChoice a random number (1, 2, or 3)
    int randomChoice = (rand() % (3 - 0 + 1)) + 0;
    return randomChoice;
}

//Determine who wins
char winner(int userChoice, int cpuChoice)
{
    // t = tie, c = computer wins, u = user wins
    if (userChoice == cpuChoice)
        return 't';
    else if ((userChoice == 1) && (cpuChoice == 2))
        return 'c';
    else if ((userChoice == 1) && (cpuChoice == 3))
        return 'u';
    else if ((userChoice == 2) && (cpuChoice == 1))
        return 'u';
    else if ((userChoice == 2) && (cpuChoice == 3))
        return 'c';
    else if ((userChoice == 3) && (cpuChoice == 1))
        return 'c';
    else if ((userChoice == 3) && (cpuChoice == 2))
        return 'u';
}

//Ouput who won
void outputWinner(char w, int c)
{
    if (w=='t')
        cout << endl << "The game is a tie. ";
    else if (w== 'u')
        cout << endl << "Congratulations, you win! ";
    else
        cout << endl << "Sorry, you lost. ";

    if (c == 1)
        cout << "The CPU chose rock. " << endl;
    else if (c==2)
        cout << "The CPU chose paper. " << endl;
    else
        cout << "The CPU chose scissors. " << endl;
}

//Ask if user would like to try again
char tryAgain()
{
    string input = "";
    char response;

    //ensures response is a char and is either y, Y, n, or N
    while (true)
    {
        cout << endl;
        cout << "Would you like to try again? (Y/N): ";
        getline(cin, input);
        stringstream myStream(input);
        if (input.length() == 1)
        {
            response = input[0];
            if ((response == 'y') || (response == 'Y') || (response == 'n') || (response == 'N'))
                break;
        }
        cout << endl << "Please enter 'Y' or 'N'" << endl;
    }

    cout << endl;
    return response;
}

//int main()
int _tmain(int argc, _TCHAR* argv[])
{
    char response = 'y';
    do
    {
        introduction();
        int choice = userChoice();
        int randomChoice = cpuChoice();
        char w = winner(choice,randomChoice);
        outputWinner(w, randomChoice);
        response = tryAgain();
    }   while ((response == 'y') || (response == 'Y'));

    return 0;