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  1. using System;
  2. using static System.Console;
  3. using static System.Math;
  4. using System.Diagnostics;
  5.  
  6. public class Program {
  7. 	public static void Main() {
  8. 		var tempo = new Stopwatch();
  9. 		WriteLine("Decimal");
  10. 		tempo.Start();
  11. 		for (var valor = -10000M; valor <= 10000M; valor += 0.05M) valor.RoundMidPoint();
  12.         tempo.Stop();
  13.         WriteLine("Arredondando em ms: {0}", tempo.ElapsedMilliseconds);
  14. 		WriteLine("Double");
  15. 		tempo.Start();
  16. 		for (var valor = -10000.0; valor <= 10000.0; valor += 0.05) valor.RoundMidPoint();
  17.         tempo.Stop();
  18.         WriteLine("Arredondando em ms: {0}", tempo.ElapsedMilliseconds);
  19. 		WriteLine("Decimal Alternativo");
  20. 		tempo.Start();
  21. 		for (var valor = -10000M; valor <= 10000M; valor += 0.05M) valor.RoundMidPointAlt();
  22.         tempo.Stop();
  23.         WriteLine("Arredondando em ms: {0}", tempo.ElapsedMilliseconds);
  24. 		WriteLine("Double Alternativo");
  25. 		tempo.Start();
  26. 		for (var valor = -10000.0; valor <= 10000.0; valor += 0.05) valor.RoundMidPointAlt();
  27.         tempo.Stop();
  28.         WriteLine("Arredondando em ms: {0}", tempo.ElapsedMilliseconds);
  29. 	}
  30. }
  31.  
  32. public static class RoundUtil {
  33. 	public static Decimal RoundMidPoint(this Decimal value) => Sign(value) * Ceiling(Abs(value) * 2) / 2;
  34.  
  35. 	public static double RoundMidPoint(this double value) => Sign(value) * Ceiling(Abs(value) * 2) / 2;
  36.  
  37. 	public static Decimal RoundMidPointAlt(this Decimal value) {
  38. 		int intPart = (int)value;
  39. 		decimal decimalPart = value - intPart;
  40. 		if (0 < decimalPart && decimalPart <= 0.5M) return intPart + 0.5M;
  41. 		else if (0.5M < decimalPart) return intPart + 1;
  42. 		else return intPart;
  43. 	}
  44.  
  45. 	public static double RoundMidPointAlt(this double value) {
  46. 		int intPart = (int)value;
  47. 		double decimalPart = value - intPart;
  48. 		if (0 < decimalPart && decimalPart <= 0.5) return intPart + 0.5;
  49. 		else if (0.5 < decimalPart) return intPart + 1;
  50. 		else return intPart;
  51. 	}
  52. }
  53.  
  54. //http://pt.stackoverflow.com/q/16185/101
Success #stdin #stdout 0.18s 17348KB
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stdin
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Standard input is empty
stdout
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Decimal
Arredondando em ms: 83
Double
Arredondando em ms: 86
Decimal Alternativo
Arredondando em ms: 158
Double Alternativo
Arredondando em ms: 160
https://ideone.com/exn6PR
language:
C# (gmcs 5.20.1)
created:
3 years ago
visibility:
public

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