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  1. using System;
  2.  
  3. public class Test
  4. {
  5. 	public static void Main()
  6. 	{
  7. 	    var values = new object[] { 42, 1.42f, 1.42d, 1.0m };
  8.             var converters = new Func<object, bool>[] { CheckNegative1, CheckNegative2 };
  9.             var dummy = false;
  10.             var watch = new System.Diagnostics.Stopwatch();
  11.  
  12.             foreach (var converter in converters) {
  13.                 foreach (var value in values) {
  14.                     watch.Reset();
  15.                     watch.Start();
  16.                     for (var i = 0; i < 3000000; ++i) {
  17.                         dummy = converter(value);
  18.                     }
  19.                     watch.Stop();
  20.                     Console.WriteLine("Testing with type {0} and converter #{1} took {2}ms",
  21.                                       value.GetType().Name,
  22.                                       Array.IndexOf(converters, converter) + 1,
  23.                                       watch.ElapsedMilliseconds);
  24.                 }
  25.  
  26.             }
  27.  
  28.             Console.Write(Convert.ToInt32(dummy));
  29. 	}
  30.  
  31. 	static bool CheckNegative1(object number) {
  32.             return Convert.ToDouble(number) < 0;
  33. 	}
  34.  
  35. 	static bool CheckNegative2(object number)
  36. 	{
  37. 	    switch(Type.GetTypeCode(number.GetType())) {
  38. 	        case TypeCode.Int32:
  39. 	            return (int)number < 0;
  40. 	        case TypeCode.Single:
  41. 	            return (float)number < 0;
  42. 	        case TypeCode.Double:
  43. 	            return (double)number < 0;
  44. 	        case TypeCode.Decimal:
  45. 	            return (decimal)number < 0;
  46.  
  47. 	        // etc etc
  48. 	        default:
  49. 	            throw new ArgumentException();
  50. 	    }
  51. 	}
  52. }
Success #stdin #stdout 3.27s 37096KB
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Standard input is empty
stdout
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Testing with type Int32 and converter #1 took 130ms
Testing with type Single and converter #1 took 118ms
Testing with type Double and converter #1 took 127ms
Testing with type Decimal and converter #1 took 1983ms
Testing with type Int32 and converter #2 took 156ms
Testing with type Single and converter #2 took 147ms
Testing with type Double and converter #2 took 157ms
Testing with type Decimal and converter #2 took 416ms
0
https://ideone.com/IrOqL
language:
C# (gmcs 5.20.1)
created:
13 years ago
visibility:
public

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