swift手记-2

//

// ViewController.swift

// learn2

// Created by myhaspl on 16/1/19.

// Copyright (c) 2016年 myhaspl. All rights reserved.

///Volumes/myhaspl/book/swift算法/src/2/learn2/learn2/Base.lproj/Main.storyboard

import Cocoa

class ViewController: NSViewController {

override func viewDidLoad() {

super.viewDidLoad()

// Do any additional setup after loading the view.

}

override var representedObject: AnyObject? {

didSet {

// Update the view,if already loaded.

}

}

private func compute(n:Int)->String{

//计算阶乘，如果计算的参数大于30，则进行近似计算

var result:Double = 1

if n<30 {

for i:Int in 1 ... n {

result = result * Double(i)

}

}

else {

var result1:Double = sqrt(2 * M_PI * Double(n))

var result2 :Double = pow(Double(n)/M_E,Double(n))

result = result1 * result2

}

return "结果"+String(stringInterpolationSegment:result)

}

@IBOutlet weak var Number: NSTextField!

@IBOutlet weak var ComputeResult: NSTextField!

@IBAction func jqCom(sender: AnyObject) {

if let n:Int=self.Number.stringValue.toInt() {

self.ComputeResult.stringValue=compute(n)

}

}

}

（编辑：李大同）

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