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Activity 2.8 Rock, Paper, Scissors Game

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Introduction

Rock, paper, scissors is a fun game to play between friends. Here is a basic rundown of the rules:

• Choose rock, paper, or scissors
• Paper covers rock
• Rock crushes scissors
• Scissors cuts paper

Skills to Practice

• Writing while loops
• Nesting code blocks

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Instructions

Setup

1. Create a new C# console application. Name the project 2.8 Rock, Paper, Scissors.
2. Click Create.

Code

int wins = 0;
int losses = 0;
int round = 1;
bool playing = true;
Random random = new();

Console.WriteLine("---ROCK, PAPER, SCISSORS---");
Console.WriteLine(" --202X Terminal Edition--");

/*
This is a multi-line comment.

1. Set the header: round number, wins, losses
2. Prompt user for player hand
3. Generate a random computer hand
4. Check who won
    i. If same hand - tie
   ii. If player chooses rock
      a. Computer paper - lose
      b. Computer scissors - win
  iii. If player chooses paper
      a. Computer scissors - lose
      b. Computer rock - win
   iv. If player chooses scissors
      a. Computer rock - lose
      b. Computer paper - win
5. Prompt user to play again
*/

while (playing)
{
    Console.WriteLine($"\nROUND {round}!");
    Console.WriteLine($"W: {wins} - L: {losses}");
    Console.WriteLine("Rock, Paper, Scissors?");
    Console.Write("-> ");
    string player = Console.ReadLine().ToLower();

    int randomNumber = random.Next(0, 3);
    string computer;

    if (randomNumber == 0)
    {
        computer = "rock";
    }
    else if (randomNumber == 1)
    {
        computer = "paper";
    }
    else
    {
        computer = "scissors";
    }

    Console.WriteLine($"Computer chooses {computer}!");

    if (player == computer)
    {
        Console.WriteLine("Tie!");
    }
    else if (player == "rock" && computer == "scissors")
    {
        Console.WriteLine("You win! Rock crushes scissors!");
        wins++;
    }
    else if (player == "rock" && computer == "paper")
    {
        Console.WriteLine("You lose! Paper covers rock!");
        losses++;
    }
    else if (player == "paper" && computer == "rock")
    {
        Console.WriteLine("You win! Paper covers rock!");
        wins++;
    }
    else if (player == "paper" && computer == "scissors")
    {
        Console.WriteLine("You lose! Scissors cuts paper!");
        losses++;
    }
    else if (player == "scissors" && computer == "paper")
    {
        Console.WriteLine("You win! Scissors cuts paper!");
        wins++;
    }
    else if (player == "scissors" && computer == "rock")
    {
        Console.WriteLine("You lose! Rock crushes scissors!");
        losses++;
    }
    else
    {
        Console.WriteLine("You typed something wrong. You suck.");
    }

    Console.Write("Play again (yes/no)? ");
    string playAgain = Console.ReadLine();

    if (playAgain == "no")
    {
        playing = false;
    }
    else
    {
        round++;
    }
}

Debug

---ROCK, PAPER, SCISSORS---
 --202X Terminal Edition--

ROUND 1!
W: 0 - L: 0
Rock, Paper, Scissors?
-> rock
Computer chooses rock!
Tie!
Play again (yes/no)? yes

ROUND 2!
W: 0 - L: 0
Rock, Paper, Scissors?
-> paper
Computer chooses scissors!
You lose! Scissors cuts paper!
Play again (yes/no)? yes

ROUND 3!
W: 0 - L: 1
Rock, Paper, Scissors?
-> scissors
Computer chooses rock!
You lose! Rock crushes scissors!
Play again (yes/no)? no

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Tips, Tricks, and Reflection

• You can also try rewrite the code to use nested if statements within each player choice to avoid using logical and &&. But more nesting == more headaches.
• Try making a two player version of rock, paper, scissors. When player one’s turn is done, you can call the method Console.Clear() to clear the screen, so player two can’t cheat.

Console.Clear();

• If you want to ascend as a programmer, try upgrading the game to Rock, paper, scissors, lizard, Spock!
• As the complexity of your applications increases, it’s more important than ever to write out the requirements beforehand. The multi-line comment in the activity code is a basic, but useful guide to tracking what needs to be implemented in the program.