function

let a = 100

let b = 200

func plus (num001 : Int, num002 : Int) -> (String, Int) {

    return ("result is", num001 + num002)

}

let result001 = plus(num001: a, num002: b)

print(result001) // result : ("result is", 300)

print(result001.0) // result : result is

print(result001.1) // result : 300

 

func minus (_ num001 : Int, _ num002 : Int) -> (String, Int) {

    return ("result is", num001 - num002)

}

let result002 = minus(num001: a, num002: b) // error : Extraneous argument labels 'num001:num002:' in call

let result002 = minus(a, b)

print(result002) // result : ("result is", -100)

print(result002.0) // result : result is

print(result002.1) // result : -100