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39 lines
1.1 KiB
Swift
39 lines
1.1 KiB
Swift
//===--- MonteCarloPi.swift -----------------------------------------------===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2021 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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import TestsUtils
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public let benchmarks =
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BenchmarkInfo(
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name: "MonteCarloPi",
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runFunction: run_MonteCarloPi,
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tags: [.validation, .algorithm],
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legacyFactor: 125)
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public func run_MonteCarloPi(scale: Int) {
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var rng = LFSR()
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var pointsInside = 0
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let r = 10000
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let n = 4_000*scale
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for _ in 1...n {
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let x = Int(truncatingIfNeeded: rng.next()) % r
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let y = Int(truncatingIfNeeded: rng.next()) % r
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if x*x + y*y < r*r {
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pointsInside += 1
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}
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}
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let pi_estimate: Double = Double(pointsInside)*4.0/Double(n)
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let pi = 3.1415
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check(abs(pi_estimate - pi) < 0.2)
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}
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