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  1. using System;
  2. using System.Collections.Generic;
  3.  
  4. public static class Sorteio {
  5.     public static void Main() {
  6.         int[] array = { 1, 2, 3, 4 };
  7.         array.Shuffle();
  8.         foreach (var valor in array) {
  9.             Console.WriteLine(valor);
  10.         }
  11.         Console.WriteLine("Soma: {0}", array[0] + array[2]); // soma 1o. e 3o. elemento
  12.         //vamos de novo
  13.         array.Shuffle(); //com poucos númros tem chance de repetir
  14.         Console.WriteLine("Soma novo sorteio: {0}", array[0] + array[2]); // soma 1o. e 3o. elemento
  15.     }
  16. }
  17.  
  18. namespace System.Collections.Generic {
  19.     public static class IListExt {
  20.         static Random r = new Random(DateTime.Now.Millisecond);
  21.  
  22.         public static void Shuffle<T>(this IList<T> list, int lowerItem, int upperItem) {
  23.             upperItem = upperItem > list.Count ? list.Count : upperItem;
  24.             lowerItem = lowerItem < 0 ? 0 : lowerItem;
  25.             for (int i = lowerItem; i < upperItem; i++) {
  26.                 int j = r.Next(i, upperItem);
  27.                 T tmp = list[j];
  28.                 list[j] = list[i];
  29.                 list[i] = tmp;
  30.             }
  31.         }
  32.  
  33.         public static void Shuffle<T>(this IList<T> list, int upperItem) {
  34.             list.Shuffle(0, upperItem);
  35.         }
  36.  
  37.         public static void Shuffle<T>(this IList<T> list) {
  38.             list.Shuffle(0, list.Count);
  39.         }
  40.     }
  41. }
Success #stdin #stdout 0.07s 24144KB
comments (?)
stdin
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Standard input is empty
stdout
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3
1
4
2
Soma: 7
Soma novo sorteio: 5
https://ideone.com/vGLiFT
language:
C# (gmcs 5.20.1)
created:
9 years ago
visibility:
public

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