达到变量变量9223372036854775808会使我的程序崩溃

Question

达到可变变量9223372036854775808会使我的程序崩溃。

我找不到任何信息。

import UIKit

class ViewController: UIViewController {
    @IBOutlet weak var disview: UILabel!
    var dislikes = 1

    @IBAction func dislike(_ sender: Any) { //Add to dislikes VAR and refresh display
        dislikes += dislikes //when this reaches 9223372036854775808 my program crashes
        print(dislikes)
        disview.text = "\(dislikes)"
    }

    @IBAction func reset(_ sender: Any) { //Reset dislikes varibles to 0 and refresh display
        dislikes = 0 
        print("reset dislikes")
        disview.text = "\(dislikes)"
    }

我得到：

  

线程1：EXC_BAD_INSTRUCTION（代码= EXC_I386_INVOP，子代码= 0x0）

Answer 1

是的，整数溢出将使您的程序在Swift中崩溃。

如果要允许溢出，可以使用overflow operators＆+＆-＆*

dislikes = dislikes &+ dislikes