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  1. using System;
  2. using System.Diagnostics;
  3.  
  4. public class Test
  5. {
  6. 	private const int TEST_COUNT = 10000000;
  7.  
  8.         private static double[] xs;
  9.  
  10.         private static double[] ys;
  11.  
  12.         private static double a;
  13.  
  14.         private static double l;
  15.  
  16.         private static double x;
  17.  
  18.         private static double y;
  19.  
  20.         private static void Reset()
  21.         {
  22.             for (var i = 0; i < TEST_COUNT; i++)
  23.             {
  24.                 xs[i] = 100;
  25.                 ys[i] = 100;
  26.             }
  27.         }
  28.  
  29.         public static void Main(string[] args)
  30.         {
  31.             var sw = new Stopwatch();
  32.  
  33.             xs = new double[TEST_COUNT];
  34.             ys = new double[TEST_COUNT];
  35.  
  36.             // test 1
  37.             Reset();
  38.             sw.Reset();
  39.             sw.Start();
  40.             for (var i = 0; i < TEST_COUNT; i++)
  41.             {
  42.                 x = xs[i];
  43.                 y = ys[i];
  44.                 a = Math.Atan2(y, x);
  45.                 l = Math.Sqrt(x * x + y * y);
  46.                 xs[i] = (l - 10) * Math.Cos(a);
  47.                 ys[i] = (l - 10) * Math.Sin(a);
  48.             }
  49.             var test1 = sw.Elapsed;
  50.  
  51.             // test 2
  52.             Reset();
  53.             sw.Reset();
  54.             sw.Start();
  55.             for (int i = 0; i < TEST_COUNT; i++)
  56.             {
  57.                 x = xs[i];
  58.                 y = ys[i];
  59.                 l = Math.Sqrt(x * x + y * y);
  60.                 xs[i] = (l - 10) * (x / l);
  61.                 ys[i] = (l - 10) * (y / l);
  62.             }
  63.             var test2 = sw.Elapsed;
  64.  
  65.  
  66.             Console.WriteLine("test1: " + (test1.TotalMilliseconds / TEST_COUNT * 1000000).ToString("0.00") + "ns/op");
  67.             Console.WriteLine("test2: " + (test2.TotalMilliseconds / TEST_COUNT * 1000000).ToString("0.00") + "ns/op");
  68.             Console.ReadKey(true);
  69.         }
  70. }
Success #stdin #stdout 2.97s 24016KB
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stdin
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Standard input is empty
stdout
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test1: 237.51ns/op
test2: 32.93ns/op
https://ideone.com/JALCKU
language:
C# (gmcs 5.20.1)
created:
9 years ago
visibility:
public

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