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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 Decimal.Round(pi, 5);
  29.     }
  30.  
  31.     public static double Original()
  32.         {
  33.             double number = 0;
  34.             double pi;
  35.             int i = 1;
  36.  
  37.             do
  38.             {
  39.                 if ((i / 2) % 2 == 0)
  40.                 {
  41.                     number += (double)(1) / i;
  42.                 }
  43.                 else
  44.                 {
  45.                     number -= (double)(1) / i;
  46.                 }
  47.                 pi = 4 * number;
  48.                 i += 2;
  49.             } while (Math.Round(pi, 5) != 3.14159);
  50.             return Math.Round(pi, 5);
  51.         }
  52.  
  53.         public static System.TimeSpan TimeCalcOriginal()
  54.         {
  55.             Stopwatch sw = new Stopwatch();
  56.             sw.Start();
  57.             for (int i = 0; i <= 50; 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 <= 50; i++)
  70.             {
  71.                 PI3();
  72.             }
  73.             sw.Stop();
  74.             return sw.Elapsed;
  75.         }
  76. }
Success #stdin #stdout 4.94s 131968KB
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stdin
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Standard input is empty
stdout
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Original
3.14159
00:00:00.1206433
PI3
3.14159
00:00:04.7065676
https://ideone.com/t73laU
language:
C# (gmcs 5.20.1)
created:
7 years ago
visibility:
public

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