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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("PI4");
  12.         Console.WriteLine(PI4());
  13.         Console.WriteLine(TimeCalcPI4());
  14.         Console.ReadKey();
  15.     }
  16.  
  17.     public static decimal PI4()
  18. {
  19.     decimal pi = 4m, iteration = 3m, piAvg;
  20.     do
  21.     {   
  22.         pi = Decimal.Subtract(pi, Decimal.Divide(4m, iteration));
  23.         piAvg = pi;
  24.         iteration = decimal.Add(iteration, 2m);
  25.         pi = Decimal.Add(pi, Decimal.Divide(4m, iteration));
  26.         piAvg = Decimal.Divide(Decimal.Add(pi, piAvg), 2m);
  27.         iteration = decimal.Add(iteration, 2m);
  28.         if(decimal.Add(iteration, 1m) % 100000m == 0) {
  29.             Debug.WriteLine(piAvg);
  30.         }
  31.     } while (Decimal.Round(piAvg, 5) != 3.14159m);
  32.     //} while (Decimal.Round(piAvg, 10) != 3.1415926536m);      //3.1415926535897932384626433833
  33.     return Decimal.Round(piAvg, 10);
  34. }
  35.  
  36.     public static decimal Original()
  37.     {
  38.         decimal number = 0m;
  39.         decimal pi;
  40.         int i = 1;
  41.  
  42.         do
  43.         {
  44.             if ((i / 2) % 2 == 0)
  45.             {
  46.                 number += 1m / i;
  47.             }
  48.             else
  49.             {
  50.                 number -= 1m / i;
  51.             }
  52.             pi = 4 * number;
  53.             i += 2;
  54.         } while (Decimal.Round(pi, 5) != 3.14159m);
  55.         return (Decimal.Round(pi, 5));
  56.     }
  57.  
  58.     public static System.TimeSpan TimeCalcOriginal()
  59.     {
  60.         Stopwatch sw = new Stopwatch();
  61.         sw.Start();
  62.         for (int i = 0; i <= 50; i++)
  63.         {
  64.             Original();
  65.         }
  66.         sw.Stop();
  67.         return sw.Elapsed;
  68.     }
  69.  
  70.     public static System.TimeSpan TimeCalcPI4()
  71.     {
  72.         Stopwatch sw = new Stopwatch();
  73.         sw.Start();
  74.         for (int i = 0; i <= 50; i++)
  75.         {
  76.             PI4();
  77.         }
  78.         sw.Stop();
  79.         return sw.Elapsed;
  80.     }
  81. }
Success #stdin #stdout 2.05s 131776KB
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stdin
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Standard input is empty
stdout
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Original
3.14159
00:00:02.0004577
PI4
3.1415850540
00:00:00.0042330
https://ideone.com/rTWszF
language:
C# (gmcs 5.20.1)
created:
8 years ago
visibility:
public

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