매개변수

소개

예제

func arithmeticMean(_ numbers: Double...) -> Double {
    var total: Double = 0
    for number in numbers {
        total += number
    }
    return total / Double(numbers.count)
}

var result = arithmeticMean(1, 2, 3, 4, 5)
print(result)
// returns 3.0, which is the arithmetic mean of these five numbers
result = arithmeticMean(3, 8.25, 18.75)
print(result)
// returns 10.0, which is the arithmetic mean of these three numbers

주의

입출력 매개변수

예제

/* 
In the example below, the value of someInt 
is assigned to anotherInt and the value 
of anotherInt to someInt.
*/
// Note that these two types have variables.
func swapTwoInts(_ a: inout Int, _ b: inout Int) {
    let temporaryA = a
    a = b
    b = temporaryA
}

var someInt = 3
var anotherInt = 107

// Note that the corresponding arguments 
//are passed ampersant while calling the function.
swapTwoInts(&someInt, &anotherInt)


print("someInt is now \(someInt), and anotherInt is now \(anotherInt)")
// Prints "someInt is now 107, and anotherInt is now 3"

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