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  1. using System;
  2. using System.Diagnostics;
  3.  
  4. public class Test
  5. {
  6.     public static void Main()
  7.     {
  8.         Console.WriteLine("Original");
  9.         Console.WriteLine(Original());
  10.         Console.WriteLine(TimeCalcOriginal());
  11.         Console.WriteLine("PI3");
  12.         Console.WriteLine(PI3());
  13.         Console.WriteLine(TimeCalcPI3());
  14.         Console.ReadKey();
  15.     }
  16.  
  17.     public static decimal PI3()
  18.     {
  19.         decimal pi = 4m, iteration = 3m;
  20.         do
  21.         {
  22.             pi -= 4m / iteration;
  23.             iteration += 2m;
  24.             pi += 4m / iteration;
  25.             iteration += 2m;
  26.             //Debug.WriteLine(pi);
  27.         } while (Decimal.Round(pi, 5) != 3.14159M);
  28.         return iteration;
  29.     }
  30.  
  31.     public static decimal Original()
  32.     {
  33.         decimal number = 0m;
  34.         decimal pi;
  35.         int i = 1;
  36.  
  37.         do
  38.         {
  39.             if ((i / 2) % 2 == 0)
  40.             {
  41.                 number += 1m / i;
  42.             }
  43.             else
  44.             {
  45.                 number -= 1m / i;
  46.             }
  47.             pi = 4 * number;
  48.             i += 2;
  49.         } while (Decimal.Round(pi, 5) != 3.14159m);
  50.         return i;
  51.     }
  52.  
  53.     public static System.TimeSpan TimeCalcOriginal()
  54.     {
  55.         Stopwatch sw = new Stopwatch();
  56.         sw.Start();
  57.         for (int i = 0; i <= 30; i++)
  58.         {
  59.             Original();
  60.         }
  61.         sw.Stop();
  62.         return sw.Elapsed;
  63.     }
  64.  
  65.     public static System.TimeSpan TimeCalcPI3()
  66.     {
  67.         Stopwatch sw = new Stopwatch();
  68.         sw.Start();
  69.         for (int i = 0; i <= 30; i++)
  70.         {
  71.             PI3();
  72.         }
  73.         sw.Stop();
  74.         return sw.Elapsed;
  75.     }
  76. }
Success #stdin #stdout 4.22s 131712KB
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stdin
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Standard input is empty
stdout
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Original
261317
00:00:01.2256883
PI3
852367
00:00:02.8600439
https://ideone.com/NuJq6W
language:
C# (gmcs 5.20.1)
created:
8 years ago
visibility:
public

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