IOS_swift_函數用法

IOS_swift_函數用法
1.多個傳回值

 

 

    func x(x:Int, y:Int)->(Int, Int){        let a = x+y        let b = x-y        return (a, b)    }    let (a, b) = x(10, y: 3)    print(a = (a))    let val = x(10, y: 3)    print(val = (val.0))

 

 

2.預設參數

 

 

    func x(x:Int, y:Int=10)->(Int, Int){        let a = x+y        let b = x-y        return (a, b)    }    x(10)    x(10, y: 3)

 

 

3.函數參數

 

 

    z(y, x: 10, y: 7)        func x(x:Int, y:Int)->(Int, Int){        let a = x+y        let b = x-y        return (a, b)    }        func z(fx:(Int, Int)->(Int,Int), x:Int, y:Int){        let x = fx(x, y).0;        print(x = (x))    }

 

 

4.關鍵字inout

 

 

    func change(inout m:Int){        m = 10;    }    var xx = 2;    change(&xx)    print(xx = (xx))