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  1. using System;
  2. using System.IO;
  3.  
  4. public class Program
  5. {
  6.     static void Main(string[] args)
  7.     {
  8.         MemoryStream ms = new MemoryStream();
  9.         ms.WriteByte(100);
  10.         ms.WriteByte(100);
  11.         ms.WriteByte(0);
  12.         ms.WriteByte(200);
  13.         ms.WriteByte(200);
  14.         ms.WriteByte(1);
  15.         ms.WriteByte(50);
  16.  
  17.         ms.Seek(0, SeekOrigin.Begin);
  18.         Console.WriteLine(Factory.FromStream(ms));
  19.         Console.WriteLine(Factory.FromStream(ms));
  20.     }
  21. }
  22.  
  23. public struct Point
  24. {
  25.     public int X;
  26.     public int Y;
  27.  
  28.     public override string ToString()
  29.     {
  30.         return string.Format("<Point(X={0}, Y={1})>", X, Y);
  31.     }
  32. }
  33.  
  34. public class Shape
  35. {
  36.     protected Point origin;
  37.  
  38.     public Shape(int x, int y)
  39.     {
  40.         origin.X = x;
  41.         origin.Y = y;
  42.     }
  43.  
  44.     public override string ToString()
  45.     {
  46.         return string.Format("<Shape(origin={0})>", origin);
  47.     }
  48. }
  49.  
  50. public class Circle : Shape
  51. {
  52.     private double r;
  53.  
  54.     public Circle(int x, int y , int r) : base(x, y)
  55.     {
  56.         this.r = r;
  57.     }
  58.  
  59.     public override string ToString()
  60.     {
  61.         return string.Format("<Circle(origin={0}, r={1})>", origin, r);
  62.     }
  63. }
  64.  
  65. public class Factory
  66. {
  67.     public static Shape FromStream(Stream stream)
  68.     {
  69.         int x = stream.ReadByte();
  70.         int y = stream.ReadByte();
  71.         switch (stream.ReadByte())
  72.         {
  73.             case 0:
  74.                 return new Shape(x, y);
  75.             case 1:
  76.                 return new Circle(x, y, stream.ReadByte());
  77.             default:
  78.                 throw new Exception();
  79.         }
  80.     }
  81. }
  82.  
Success #stdin #stdout 0.01s 29672KB
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Standard input is empty
stdout
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<Shape(origin=<Point(X=100, Y=100)>)>
<Circle(origin=<Point(X=200, Y=200)>, r=50)>
https://ideone.com/iKZ5UJ
language:
C# (gmcs 5.20.1)
created:
7 years ago
visibility:
public

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