| //===--- MonteCarloPi.swift -----------------------------------------------===// |
| // |
| // This source file is part of the Swift.org open source project |
| // |
| // Copyright (c) 2014 - 2016 Apple Inc. and the Swift project authors |
| // Licensed under Apache License v2.0 with Runtime Library Exception |
| // |
| // See http://swift.org/LICENSE.txt for license information |
| // See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors |
| // |
| //===----------------------------------------------------------------------===// |
| |
| import TestsUtils |
| |
| public func run_MonteCarloPi(scale: Int) { |
| var pointsInside = 0 |
| let r = 10000 |
| let N = 500000*scale |
| for _ in 1...N { |
| let x = Int(truncatingBitPattern: Random())%r |
| let y = Int(truncatingBitPattern: Random())%r |
| if x*x + y*y < r*r { |
| pointsInside += 1 |
| } |
| } |
| let pi_estimate: Double = Double(pointsInside)*4.0/Double(N) |
| let pi = 3.1415 |
| CheckResults(abs(pi_estimate - pi) < 0.1, |
| "Incorrect results in MonteCarloPi: pi_estimate == \(pi_estimate)") |
| } |
