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  1. using System;
  2.  
  3. namespace ConsoleApplication25
  4. {
  5.     class Program
  6.     {
  7.         static void Main(string[] args)
  8.         {
  9.             Console.WriteLine("Hello\tworld\r\n");
  10.             Console.WriteLine(@"Hello
  11. World");
  12.  
  13.             double f = 42;
  14.             int i = (int) f;
  15.  
  16.             var products = new[]
  17.             {
  18.                 new Product("Milk", 100),
  19.                 new Product("Bread", 150.8m),
  20.                 new SuperProduct("!!!"), 
  21.             };
  22.  
  23.             Console.WriteLine(products.Length);
  24.             Console.WriteLine(products[0] == products[1]);
  25.             Console.WriteLine(products[0] == new Product("Milk", 100));
  26.  
  27.             foreach (var product in products)
  28.             {
  29.                 Console.WriteLine(product);
  30.             }
  31.  
  32.             Console.WriteLine(new Product(null, products[0].Price).Price + "$");
  33.  
  34.             var p = new SuperProduct(null);
  35.             p.SomeEvent += (sender, s) =>
  36.             {
  37.                 Console.WriteLine("Hello event");
  38.             };
  39.             p.Foo().Foo();
  40.  
  41.             Console.WriteLine(ReverseString("Reversed string"));
  42.             Console.WriteLine("Reversed string".MyReverse());
  43.         }
  44.  
  45.         public static string ReverseString(string str)
  46.         {
  47.             if (str.Length == 0)
  48.                 return str;
  49.             return str[str.Length - 1] + ReverseString(str.Substring(0, str.Length - 1));
  50.         }
  51.  
  52.         class Product : IEquatable<Product>
  53.         {
  54.             public Product(string name, decimal price)
  55.             {
  56.                 Name = name;
  57.                 Price = price;
  58.             }
  59.  
  60.             public string Name { get; }
  61.             public decimal Price { get; }
  62.  
  63.             public delegate void MyEventHandler(object sender, string arg);
  64.  
  65.             public event MyEventHandler SomeEvent;
  66.  
  67.             protected virtual void OnSomeEvent(string arg)
  68.             {
  69.                 SomeEvent?.Invoke(this, arg);
  70.             }
  71.  
  72.             public override string ToString()
  73.             {
  74.                 return $"Name: {Name}, Price: {Price}";
  75.             }
  76.  
  77.             public bool Equals(Product other)
  78.             {
  79.                 if (ReferenceEquals(null, other)) return false;
  80.                 if (ReferenceEquals(this, other)) return true;
  81.                 return string.Equals(Name, other.Name) && Price == other.Price;
  82.             }
  83.  
  84.             public override bool Equals(object obj)
  85.             {
  86.                 if (ReferenceEquals(null, obj)) return false;
  87.                 if (ReferenceEquals(this, obj)) return true;
  88.                 if (obj.GetType() != this.GetType()) return false;
  89.                 return Equals((Product) obj);
  90.             }
  91.  
  92.             public override int GetHashCode()
  93.             {
  94.                 unchecked
  95.                 {
  96.                     return ((Name != null ? Name.GetHashCode() : 0)*397) ^ Price.GetHashCode();
  97.                 }
  98.             }
  99.  
  100.             public static bool operator ==(Product left, Product right)
  101.             {
  102.                 return Equals(left, right);
  103.             }
  104.  
  105.             public static bool operator !=(Product left, Product right)
  106.             {
  107.                 return !Equals(left, right);
  108.             }
  109.         }
  110.  
  111.         class SuperProduct : Product
  112.         {
  113.             public SuperProduct(string name) : base(name, 99999)
  114.             {
  115.             }
  116.  
  117.             public SuperProduct Foo()
  118.             {
  119.                 OnSomeEvent(null);
  120.                 return this;
  121.             }
  122.         }
  123.     }
  124.  
  125.     public static class MyExtension
  126.     {
  127.         public static string MyReverse(this string obj)
  128.         {
  129.             return Program.ReverseString(obj);
  130.         }
  131.     }
  132. }
  133.  
Success #stdin #stdout 0.01s 131840KB
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stdin
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Standard input is empty
stdout
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Hello	world

Hello
World
3
False
True
Name: Milk, Price: 100
Name: Bread, Price: 150.8
Name: !!!, Price: 99999
100$
Hello event
Hello event
gnirts desreveR
gnirts desreveR
https://ideone.com/cKiN7Y
language:
C# (gmcs 5.20.1)
created:
7 years ago
visibility:
public

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