Twenty One

#include <iostream>
#include <fstream>
#include <string>
#include <ctime>
#include <cstdlib>
using namespace std;

//Randomizes the player's cards, the computer's cards, and the amount of cards the computer drew.
void GenNumbers(int player[], int comp[], int psize, int &csize)
{
    srand(time(0));
    csize = 1 + rand()%10;

    for(int i = 0; i < psize; i++)
    {
        player[i] = 1 + rand()%10;
    }
    for(int x = 0; x < csize; x++)
    {
        comp[x] = 1 + rand()%10;
    }
}

//Displays the game's results.
void DisplayResults(int pwin, int cwin, int draw, int rounds, string player)
{
    cout << "Here are the stats for this game: \n\n";
    cout << "     Number of rounds played: " << rounds << "\n";
    cout << "     Your wins, " << player << ": " << pwin << "\n";
    cout << "     Computer Wins: " << cwin << "\n";
    cout << "     Draws: " << draw << "\n\n";
}

int main()
{
    int pcards, ccards, pwin, cwin, draw, psum, csum, round;
    int player[10], comp[10];
    char r, waffle;
    string name;
    ofstream gamesaves ("saves.txt", ios::app);
    pwin = 0;
    cwin = 0;
    draw = 0;
    round = 1;
    //Allows the player to enter their name.
    cout << "Welcome to Twenty One! What's your name? ";
    getline(cin, name);
    do
    {
        //Resets the sum of the cards each round.
        psum = 0;
        csum = 0;
        system("cls");
        cout << "Round " << round;
        //Asks the user how many cards they would like.
        cout << "\n\nHow many cards would you like " << name << "? ";
        cin >> pcards;

        //While the amount of cards are greater than 10, the user must choose a different amount of cards.
        while(pcards > 10)
        {
            cout << name << ", you cannot have more than 10 cards. Please re-enter your amount of cards: ";
            cin >> pcards;
        }

        //Calls the GenNumbers function in order to randomize numbers.
        GenNumbers(player, comp, pcards, ccards);
        cout << "\nYour cards: ";

        //Displays the player's cards.
        for(int u = 0; u < pcards; u++)
        {
            cout << player[u] << " ";
        }

        cout << "\n\nComputer's Cards: ";

        //Displays the computer's cards.
        for(int y = 0; y < ccards; y++)
        {
            cout << comp[y] << " ";
        }

        //Adds the player's cards.
        for(int a = 0; a < pcards; a++)
        {
            psum += player[a];
        }

        //Adds the computer's cards.
        for(int uter = 0; uter < ccards; uter++)
        {
            csum += comp[uter];
        }

        cout << "\n\n\n";

        //If both sums are greater than or equal to 21, then it's a draw.
        if(psum >= 21 && csum >= 21)
        {
            cout << "DRAW!";
            draw += 1;
        }
        //If the player's sum is greater than or equal to 21 and the computer's sum is less than 21, the computer wins.
        else if(psum >= 21 && csum < 21)
        {
            cout << "The computer has won this time.";
            cwin += 1;
        }
        //If the computer's sum is greater than or equal to 21 and the player's sum is less than 21, the player wins.
        else if(csum >= 21 && psum < 21)
        {
            cout << "You win this round, " << name << "!";
            pwin += 1;
        }
        //If the two sums are both equal, it's a draw.
        else if(psum == csum)
        {
            cout << "DRAW!";
            draw += 1;
        }
        //If the player's sum is larger, the player wins.
        else if(psum > csum)
        {
            cout << "You win this round " << name << "!";
            pwin += 1;
        }
        //If the computer's sum is larger, the computer wins.
        else if(psum < csum)
        {
            cout << "The computer has won this time.";
            cwin += 1;
        }

        //Asks the player if they would like to play another round.
        cout << "\n\nWould you like to play another round(y/n): ";
        cin >> r;

        //If the player responds "yes" (or y in this case), the round number increases by one.
        if(r == 'y' || r == 'Y')
        {
            round += 1;
        }
    }while(r == 'y' || r == 'Y');
    system("cls");
    //Calls the function DisplayResults to show the stats of the game.
    DisplayResults(pwin, cwin, draw, round, name);
    //Asks the player if they would like to save the stats of this game.
    cout << "Would you like to save this game(y/n): ";
    cin >> waffle;

    //If the player responds, "yes," the game will be saved to saves.txt.
    if(waffle == 'y' || waffle == 'Y')
    {
        gamesaves << name << "'s Game:\n\n";
        gamesaves << "        " << name << "'s wins: " << pwin << "\n";
        gamesaves << "        Computer wins: " << cwin << "\n";
        gamesaves << "        Draws: " << draw << "\n";
        gamesaves << "        Number of rounds: " << round << "\n\n----------------------------\n\nj";
        system("cls");
        cout << "Game saved.\n";
    }
    //End of the program.
    cout << "Game over.\n\n";
    system("pause");
    return(0);
}