[C#] Rock, Scissors, Paper

17 Dec 2020

Reading time ~2 minutes

Reference by [C#과 유니티로 만드는 MMORPG 게임 개발 시리즈] Part1: C# 기초 프로그래밍 입문

Code

  using System;

  namespace RockScissorsPaper
  {
    enum Choice
    {
      Rock = 0,
      Scissors = 1,
      Paper = 2
    }

    class Program
    {
      static void Main(string[] args)
      {
        Random rand = new Random();
        int aiChoice = rand.Next(0, 3);
        int choice = Convert.ToInt32(Console.ReadLine());

        switch (choice)
        {
          case (int)Choice.Rock:
            Console.WriteLine("Your choice is rock.");
            break;
          case (int)Choice.Scissors:
            Console.WriteLine("Your choice is scissors.");
            break;
          case (int)Choice.Paper:
            Console.WriteLine("Your choice is paper.");
            break;
        }

        switch (aiChoice)
        {
          case (int)Choice.Rock:
            Console.WriteLine("AI choice is rock.");
              break;
          case (int)Choice.Scissors:
            Console.WriteLine("AI choice is scissors.");
            break;
          case (int)Choice.Paper:
            Console.WriteLine("AI choice is paper.");
            break;
        }

        if(choice == (int)Choice.Rock)
        {
          if(aiChoice == (int)Choice.Rock)
          {
            Console.WriteLine("Draw :|");
          }
          else if(aiChoice == (int)Choice.Scissors)
          {
            Console.WriteLine("Win :)");
          }
          else
          {
            Console.WriteLine("Lose :(");
          }
        }
        else if(choice == (int)Choice.Scissors)
        {
          if (aiChoice == (int)Choice.Rock)
          {
            Console.WriteLine("Lose :(");
          }
          else if (aiChoice == (int)Choice.Scissors)
          {
            Console.WriteLine("Draw :|");
          }
          else
          {
            Console.WriteLine("Win :)");
          }
        }
        else
        {
          if (aiChoice == (int)Choice.Rock)
          {
            Console.WriteLine("Win :)");
          }
          else if (aiChoice == (int)Choice.Scissors)
          {
            Console.WriteLine("Lose :(");
          }
          else
          {
            Console.WriteLine("Draw :|");
          }
        }
      }
    }
  }

Static

static
- Can be used without invoking an instance
- Stack Memory

  static void Main(string[] args)

new className()

new Operator
- Create an object and call a constructor
- Heap Memory

  Random rand = new Random();

Random

Exist in System Namespace
Random Constructor
- Use new keyword and the constructor to create Random type object

  Random rand = new Random();

Next() Method

Next(int minValue, int maxValue)
- minValue ~ maxValue-1
- Return Integer(n>=0)
Next(int maxValue)
- 0 ~ maxValue-1

Type Casting

String -> Int
- Convert.ToInt32(String string)
- If string is null, then 0

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

enum -> int
- (Type)enumClass.enumObject
- Be Careful when you change type bigger to small

  switch (choice)
  {
    case (int)Choice.Rock:
      Console.WriteLine("Your choice is rock.");
      break;
    case (int)Choice.Scissors:
      Console.WriteLine("Your choice is scissors.");
      break;
    case (int)Choice.Paper:
      Console.WriteLine("Your choice is paper.");
      break;
  }

Console.ReadLine()

Input string from console

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

Console.WriteLine()

Print string on console

  Console.WriteLine("Your choice is rock.");

Result

C# Rock, Scissors, Paper

Demo Video

Download

C#Game