using System;

using System.Collections.Generic;

​

public class BasicInterpreter

{

    private readonly Dictionary<string, Command> _commands = new();

    public void RegisterCommand(string name, Action<List<string>> action) => _commands[name] = new Command(action);

​

    public void Run(string code)

    {

        var lines = code.Split('\n');

        foreach (var line in lines)

        {

            ExecuteLine(line);

        }

    }

​

    private void ExecuteLine(string line)

    {

        line = line.Trim();

        if (string.IsNullOrEmpty(line)) return;

​

        var parts = line.Split(' ');

        var commandName = parts[0].ToUpper();

        var args = new List<string>(parts);

        args.RemoveAt(0); // Remove the command name from arguments

​

        if (_commands.ContainsKey(commandName))

        {

            _commands[commandName].Execute(args);

        }

        else

        {

            Console.WriteLine($"Unknown command: {commandName}");

        }

    }

}

​

public class Command

{

    private readonly Action<List<string>> _action;

​

    public Command(Action<List<string>> action) => _action = action;

​

    public void Execute(List<string> args) => _action.Invoke(args);

}

​

class Program

{

    static void Main()

    {

        var interpreter = new BasicInterpreter();

        interpreter.RegisterCommand("PRINT", PrintCommand);

        interpreter.RegisterCommand("LET", LetCommand);

        // Add more commands as needed

​

        string basicCode = @"

            PRINT ""Hello, World!""

            LET A = 10

            PRINT A

        ";

​

        interpreter.Run(basicCode);

    }

​

    static void PrintCommand(List<string> args)

    {

        Console.WriteLine(string.Join(" ", args));

    }

​

    static void LetCommand(List<string> args)

    {

        if (args.Count != 2 || !int.TryParse(args[1], out int value))

        {

            Console.WriteLine("LET command syntax error");

            return;

        }

​

        // Store the variable and its value in a dictionary or context

        Console.WriteLine($"Variable {args[0]} set to {value}");

    }

}