Logic Case Study - Rock, Paper, Scissors

Module Main();
    // Constants
    Constant Integer num_choices = 3;
    
    // Local variables
    Declare String userChoice;
    Declare String computerChoice;
    Declare String result;
    Declare String playAgain = "yes";
    
    // Main game loop
    While playAgain == "yes" Do
        // Get user's choice
        userChoice = GetUserChoice();
        // Get computer's choice
        computerChoice = GetComputerChoice();
        // Determine the winner
        result = DetermineWinner(userChoice, computerChoice);
        
        // Display results
        Display "You chose " + userChoice;
        Display "Computer chose " + computerChoice;
        Display result;
        
        // Prompt for replay
        Display "Do you want to play again? (yes/no):";
        Input playAgain;
        // Validate play again input
        While playAgain != "yes" And playAgain != "no" Do
            Display "Please enter 'yes' or 'no':";
            Input playAgain;
        EndWhile;
    EndWhile;
    
    // End of game message
    Display "Thank you for playing!";
End Module;

// Function to get the user's choice
Function GetUserChoice() Returns String;
    // Variable for user's input
    Declare String choice;
    // Prompt for choice
    Display "Choose rock, paper, or scissors:";
    Input choice;
    // Input validation
    While choice != "rock" And choice != "paper" And choice != "scissors" Do
        Display "Invalid choice. Please select rock, paper, or scissors:";
        Input choice;
    EndWhile;
    Return choice;
End Function;

// Function to get the computer's choice
Function GetComputerChoice() Returns String;
    // Array of choices
    Declare String choices[3] = {"rock", "paper", "scissors"};
    // Random choice
    Declare Integer randomIndex = GenerateRandomNumber(0, num_choices - 1);
    Return choices[randomIndex];
End Function;

// Function to determine the game winner
Function DetermineWinner(userChoice As String, computerChoice As String) Returns String;
    // Game logic
    If userChoice == computerChoice Then
        Return "It's a tie!";
    ElseIf (userChoice == "rock" And computerChoice == "scissors") Or (userChoice == "scissors" And computerChoice == "paper") Or (userChoice == "paper" And computerChoice == "rock") Then
        Return "You win!";
    Else
        Return "Computer wins!";
    EndIf;
End Function;