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| 1 // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file |
| 2 // for details. All rights reserved. Use of this source code is governed by a |
| 3 // BSD-style license that can be found in the LICENSE file. |
| 4 |
| 5 // Test that the default PRNG does converge towards Pi when doing a Monte Carlo |
| 6 // simulation. |
| 7 |
| 8 // Library tag to allow Dartium to run the test. |
| 9 #library("pi_test.dart"); |
| 10 |
| 11 #import("dart:math"); |
| 12 |
| 13 void main() { |
| 14 var prng = new Random(); |
| 15 var outside = 0; |
| 16 var inside = 0; |
| 17 for (var i = 0; i < 600000; i++) { |
| 18 var x = prng.nextDouble(); |
| 19 var y = prng.nextDouble(); |
| 20 if ((x*x) + (y*y) < 1.0) { |
| 21 inside++; |
| 22 } else { |
| 23 outside++; |
| 24 } |
| 25 } |
| 26 // Mmmmh, Pie! |
| 27 var pie = 4.0 * (inside/(inside + outside)); |
| 28 print("$pie"); |
| 29 Expect.isTrue((3.14 < pie) && (pie < 3.15)); |
| 30 } |
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