/**

*  函数的定义和调用

*/

func showIntegerArray(array:[Int])

{

    for a in array

    {

        println("\(a)")

    }

}

showIntegerArray([,,])

func maxOfValue(a:Int,b:Int) ->Int

{

    return a > b ? a : b

}

println(maxOfValue(,))

func showHelloWord(){

    println("Hello World")

}

showHelloWord()

let p0:(x:Double,y:Double) = (,)

let p1:(x:Double,y:Double) = (,)

func getLengthAndWidth(p0:(x:Double,y:Double),p1:(x:Double,y:Double)) -> (length: Double,width:Double){

    return (abs(p0.-p1.),abs((p0.-p1.)))

}

let w = getLengthAndWidth(p0, p1).width

let len =  getLengthAndWidth(p0, p1).length

println("\(len):\(w)")

/**

*  函数的内部参数和外部参数

*/

//func divisionOpertation(dividend a:Double,divsior b:Double) -> (Double)

//{

//    return a / b

//}

//加#代表内外参数

func divisionOpertation(#dividend :Double,#divsior :Double) -> (Double)

{

    return dividend / divsior

}

let res = divisionOpertation(dividend: 3.5, divsior: 1.2)

println(res)

/**

*  函数的默认参数

*/

//func joinString(s1: String,toString s2:String, joiner s3:String = "#")->(String)

//{

//    return s1+s3+s2

//

//

//

//}

//默认参数可以放到任意位置

func joinString(s1: String,toString s2:String, joiner :String = "?")->(String)

{

    return s1+joiner+s2

}

let str = joinString("hello", toString: "world" ,joiner:"#")

println(str)

/**

*  常量参数和变量参数

*/

//默认常量不能修改可以起到保护作用

//func swap(var a:Int,var b:Int)

//{

//    let t = a

//    a = b

//    b = t

//}

func swap(inout a:Int,inout b:Int)

{

    let t = a

    a = b

    b = t

}

/**

*  输入输出函数(inout)

*/

var x =

var y =

swap(&x, &y)

println("\(x),\(y)")

/**

*  变参函数

*/