4_Is Prime

4

//
//  ViewController.swift
//  Is Prime
//
//  Created by ZC on 16/1/9.
//  Copyright © 2016年 ZC. All rights reserved.
//

import UIKit

class ViewController: UIViewController {

    @IBOutlet weak var numberTextField: UITextField!

    @IBOutlet weak var result: UILabel!

    @IBAction func isItPrime(sender: AnyObject) {

        if let number = Int(numberTextField.text!) {

            var isPrime = true

            if number == 1 {

                isPrime = false

            } else if number == 2 {

                isPrime = true

            } else {

                for i in 2..<number {

                    if number % i == 0 {

                        isPrime = false
                    }
                }

            }

            if isPrime {

                result.text = "\(number) is a prime number!"

            } else {

                result.text = "\(number) is not a prime number"

            }

        } else {
            result.text = "Please enter a whole number"
        }

    }

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

}

项目：4_Is Prime