using System;

public class Program

{

    public static void Main()

    {

        // Programmer: TianYou

        // Date(s): Start: Oct 24 End: Oct 28

        // Project: Game 21

        // Description:This program is a card game where players choose the number of cards and draw them in an attempt to reach 21 points without going over.

        start:

        Console.WriteLine("Welcome to Game 21");

        Console.WriteLine("Betting? If you win, you will get double. If you lose, you will be deducted; if it's a draw, there will be no change.");

        Console.WriteLine("Enter your amount if you want to bet, enter 0 if you don't want to bet.($)");

        double bet=Convert.ToDouble(Console.ReadLine());

        double balance=0;// Player's balance

        Random rG = new Random(); //starts the random number generator

        int pC1,pC2,pC3,pC4;  //represents the four possible cards for player

        int pScore=0; //player's total score

        Console.WriteLine("How many cards do you want to draw (2-4)?");

        int nCards = Convert.ToInt32(Console.ReadLine());

        Console.WriteLine(new string('=',50));

        // Draw cards for the player according to the number of cards selected by the player

        if (nCards ==2)

        {

            //draws two cards for player (1-10)

            pC1 = rG.Next(1,11);

            pC2 = rG.Next(1,11);

            pScore = pC1+pC2;

            Console.WriteLine("Your First Card: " +pC1+ "\nYour Second Card: " +pC2+"\nYour Score: "+pScore);

        }

        if  (nCards ==3)

        {

            //draws three cards for player (1-10)

            pC1 = rG.Next(1,11);

            pC2 = rG.Next(1,11);

            pC3 = rG.Next(1,11);

            pScore = pC1+pC2+pC3; 

            Console.WriteLine("Your First Card: " +pC1+ "\nYour Second Card: " +pC2+"\nYour Third Card: "+pC3+"\nYour Score: "+pScore);

        }

        if (nCards ==4)

        {

            //draws three cards for player (1-10)

            pC1 = rG.Next(1,11);

            pC2 = rG.Next(1,11);

            pC3 = rG.Next(1,11);

            pC4 = rG.Next(1,11);

            pScore = pC1+pC2+pC3+pC4;

           Console.WriteLine("Your First Card: " +pC1+ "\nYour Second Card: " +pC2+"\nYour Third Card: "+pC3+"\nYour Forth Card: "+pC4+"\nYour Score: "+pScore);

        }

        Console.WriteLine(new string('-',50));// Dividing line

        int cC1,cC2,cC3,cC4; 

        int cScore = 0; //dealer's total score

        // Draw cards for the computer according to the number of cards selected by the player

        if (nCards ==2)

        {

            //draws two cards for player (1-10)

            cC1 = rG.Next(1,11);

            cC2 = rG.Next(1,11);

            cScore = cC1+cC2;

            Console.WriteLine("Computer's First Card: " +cC1+ "\nComputer's Second Card: " +cC2+"\nComputer's Score: "+cScore);

        }

        if  (nCards ==3)

        {

            //draws three cards for player (1-10)

            cC1 = rG.Next(1,11);

            cC2 = rG.Next(1,11);

            cC3 = rG.Next(1,11);

            cScore = cC1+cC2+cC3;

           Console.WriteLine("Computer's First Card: " +cC1+ "\nComputer's Second Card: " +cC2+"\nComputer's Third Card: "+cC3+"\nComputer's Score: "+cScore);

        }

        if (nCards ==4)

        {

            //draws three cards for player (1-10)

            cC1 = rG.Next(1,11);

            cC2 = rG.Next(1,11);

            cC3 = rG.Next(1,11);

            cC4 = rG.Next(1,11);

            cScore = cC1+cC2+cC3+cC4;

            Console.WriteLine("Computer's First Card: " +cC1+ "\nComputer's Second Card: " +cC2+"\nComputer's Third Card: "+cC3+"\nComputer's Forth Card："+cC4+"\nComputer's Score: "+cScore);

        }

        Console.WriteLine(new string('-',50));// Dividing line

        // Decide the outcome of the game

        if (pScore > 21 && cScore > 21)

        {Console.WriteLine("You and the computer are over 21! It's a draw!");

        balance+=bet;}// Player retains the bet

        else if (pScore > 21)

        {Console.WriteLine("You're over 21! The computer wins!");

        balance=0;}// Player loses their bet

        else if (cScore > 21)

        {Console.WriteLine("The computer is over 21! You win!");

        balance+=bet*2;}// Player wins double their bet

        else if (cScore > pScore)

        {Console.WriteLine("The computer wins!");

        balance=0;}// Player loses their bet

        else if (pScore > cScore)

        {Console.WriteLine("You win!");

        balance+=bet*2;}// Player wins double their bet

        else

        {Console.WriteLine("Your numbers are the same！It's a draw!");

        balance+=bet;}// Player retains the bet

        //Display the player's balance

        Console.WriteLine ("{0,-15}{1,8:C2}","Your balance：",balance);

        Console.WriteLine(new string('=',50));// Dividing line

        want:

        Console.WriteLine("Do you want to play again? (y=”yes”/ n=”no”)");

        string again= Console.ReadLine();

        switch (again)

        {

            case "y":

                Console.WriteLine("Let’s battle again!");

                goto start; // go to the start of the game

            case "n":

                Console.WriteLine("Thanks for playing! Goodbye!");

                break; // End the program

            default:

                Console.WriteLine("Invalid input. Please enter 'y' for yes or 'n' for no.");

                goto want; // go to the start of the game to ask again

        }

​

    }

}