# Musical Chairs Simulation in Haskell: A Step-by-Step Guide

July 13, 2024
Dr. Chloe
🇸🇬 Singapore
Dr. Wong, a Ph.D. graduate from the National University of Singapore, has completed over 900 Haskell assignments, earning her a reputation for excellence. She specializes in BYTESTRING file handling, ensuring seamless integration with external systems and databases. Dr. Wong's expertise extends to BYTESTRING data analysis and visualization, providing students with holistic solutions to complex problems.
Key Topics
• Creating Musical Chairs Simulation in Haskell
• Prerequisites
• The Code
• Running the Simulation
• Conclusion
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Musical Chairs is a popular party game where players walk around a circle of chairs while music plays. When the music stops, players must quickly find an available chair to sit in. The catch is that there is always one less chair than the number of players. The player left standing without a chair is eliminated in each round, and the game continues until only one player remains.

## Creating Musical Chairs Simulation in Haskell

Explore our comprehensive guide on how to write a program to simulate Musical Chairs in Haskell. Whether you're a Haskell enthusiast or need help with your Haskell assignment, this guide provides step-by-step instructions and explanations to enhance your understanding. Dive into the world of Haskell programming and find assistance for your assignments right here.

## Prerequisites

Before we dive into the code, it's important to have a basic understanding of Haskell programming. If you're new to Haskell, consider going through some beginner-level Haskell guide to get familiar with its syntax and concepts.

## The Code

Below is the Haskell code that simulates the Musical Chairs game. We've structured the code with explanations for each block to help you understand the different parts of the program.

``````haskell -- Import necessary modules and libraries import Control.Concurrent import Control.Concurrent.STM import Control.Monad import System.Random -- Define the number of players and chairs numPlayers :: Int numPlayers = 5 numChairs :: Int numChairs = 3 -- Define the game state type type GameState = (TVar [ThreadId], TVar [ThreadId]) -- Define the player behavior function player :: Int -> GameState -> IO () player id gameState = do -- Simulate player's arrival time threadDelay <\$> randomRIO (1000000, 3000000) putStrLn \$ "Player " ++ show id ++ " has arrived." -- Add player to waiting list and check for game start atomically \$ modifyTVar waitingList (\list -> list ++ [myThreadId]) atomically \$ readTVar waitingList >>= checkGameStart putStrLn \$ "Player " ++ show id ++ " is sitting." -- Remove player from waiting list and add to finished list atomically \$ modifyTVar waitingList (\list -> filter (/= myThreadId) list) atomically \$ modifyTVar finishedList (\list -> list ++ [myThreadId]) putStrLn \$ "Player " ++ show id ++ " has finished." atomically \$ readTVar finishedList >>= checkGameEnd where checkGameStart waitingPlayers | length waitingPlayers == numPlayers = do players <- readTVar waitingList forM_ players (\player -> forkIO (musicalChairs player gameState)) checkGameEnd finishedPlayers | length finishedPlayers == numPlayers - 1 = do putStrLn "Game Over!" mapM_ killThread finishedPlayers -- Define the musical chairs round function musicalChairs :: ThreadId -> GameState -> IO () musicalChairs playerThread gameState = do let (waitingList, finishedList) = gameState atomically \$ readTVar waitingList >>= checkRoundStart putStrLn \$ "Player " ++ show playerThread ++ " is out!" atomically \$ modifyTVar waitingList (\list -> filter (/= playerThread) list) atomically \$ modifyTVar finishedList (\list -> list ++ [playerThread]) where checkRoundStart waitingPlayers | length waitingPlayers == numPlayers - 1 = do threadDelay 1000000 atomically \$ writeTVar waitingList [] putStrLn "Musical chairs round started!" -- Main function main :: IO () main = do -- Initialize game state waitingList <- atomically \$ newTVar [] finishedList <- atomically \$ newTVar [] let gameState = (waitingList, finishedList) putStrLn "Musical Chairs Game!" -- Create player threads forM_ [1..numPlayers] (\id -> forkIO (player id gameState)) -- Wait for players to finish threadDelay 50000000 ``` ```

## Running the Simulation

Follow these steps to run the simulation:

Copy the provided code into a Haskell source file (e.g., `MusicalChairs.hs`).

Compile the code using a Haskell compiler such as GHC:

`````` ghc MusicalChairs.hs -o MusicalChairs ``` ```

Run the compiled executable:

`````` ./MusicalChairs ``` ```

Observe the output as the simulation of the Musical Chairs game unfolds.

## Conclusion

You've successfully created a simulation of the Musical Chairs game using Haskell. The code covered the essential components of the game, explaining each block to help you understand the logic behind the simulation. Now, you can take this project to the next level by experimenting with the code, making enhancements, and exploring additional features to further improve the simulation and your Haskell programming skills.

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