Swift新手基本功能

Question

func myEarnings(net: Double) -> Double {
    let tax: Double = net * 0.3
    return net - tax
}

myEarnings(net: 710.45)

我无法从代码中获得输出。我不明白为什么。操场上没有虫子。

Answer 1

尝试

override func viewDidLoad() {
        super.viewDidLoad()
    let value = myEarnings(net: 710.45) //store the value return by function
    print("value",value)
    }

    func myEarnings(net: Double) -> Double {
        let tax: Double = net * 0.3
        return net - tax
    }

Answer 2

如果您只想查看函数将返回的内容，请使用

print(myEarnings(net: 710.45))