func (func)

let a = 100

let b = 200

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

    return (num001 + num002)

}

 

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

    return (num001 - num002)

}

 

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

    return (num001 * num002)

}

 

var inputButtonType = "+"

 

if inputButtonType == "+" {

    print("result", plus(num001: a, num002: b))

} else if inputButtonType == "-" {

    print("result", minus(a, b))

} else if inputButtonType == "*" {

    print("result", multiply(a, b))

}

 

func displayCalc(result: ((Int, Int) -> Int)) {

    print("result", result(a, b))

}

 

if inputButtonType == "+" {

    displayCalc(result: plus)

}