Paper Scissor Rock (C#)

Attention.md

Paper, Scissor, Rock (C#)

Problem Statement

Two players choose one of rock, paper and scissors after counting to three and making one of these gestures:

• A clenched fist representing a rock.

• A flat hand representing a piece of paper.

• Index and middle finger extended representing a pair of scissors

Rules

If they choose the same gesture, neither wins; if not, the result is decided this way:

• Rock defeats scissors, because a rock will blunt a pair of scissors

• Paper defeats rock, because a paper can wrap up a rock

• Scissors defeat paper, because scissors cut paper

PaperScissorRock.cs

using System;

public interface Beatable {
  string Beats(Beatable other);
}

class Paper : Beatable {
  public string Beats(Beatable other) {
    if (other.GetType() == typeof(Rock))
      return "paper wins";
  
    if (other.GetType() == typeof(Scissor)) 
      return "paper loses";
    
    return "draw";
  }
}

class Scissor : Beatable {
  public string Beats(Beatable other) {
    if (other.GetType() == typeof(Rock))
      return "scissor loses";
    
    if (other.GetType() == typeof(Paper))
      return "scissor wins";
    
    return "draw";
  }
}

class Rock : Beatable {
  public string Beats(Beatable other) {
    if (other.GetType() == typeof(Paper)) 
      return "rock loses";
    
    if (other.GetType() == typeof(Scissor)) 
      return "rock wins";
    
    return "draw";
  }
}

public class PaperScissorRock {
  public static void Main(string[] args) {
    var paper = new Paper();
    var rock = new Rock();
    var scissor = new Scissor();

    Console.WriteLine("paper.Beats(paper) = " + paper.Beats(paper));
    Console.WriteLine("paper.Beats(scissor) = " + paper.Beats(scissor));
    Console.WriteLine("paper.Beats(rock) = " + paper.Beats(rock));
    Console.WriteLine("scissor.Beats(paper) = " + scissor.Beats(paper));
    Console.WriteLine("scissor.Beats(scissor) = " + scissor.Beats(scissor));
    Console.WriteLine("scissor.Beats(rock) = " + scissor.Beats(rock));
    Console.WriteLine("rock.Beats(paper) = " + rock.Beats(paper));
    Console.WriteLine("rock.Beats(scissor) = " + rock.Beats(scissor));
    Console.WriteLine("rock.Beats(rock) = " + rock.Beats(rock));
  }
}