[Swift] Function2

import UIKit
import Foundation

//function(함수)

let a = 10
let b = 20

var c = 0
func customPlus(_ num1:Int,_ num2:Int) -> Int {
    return num1 + num2
}

func minus(_ num1:Int,_ num2:Int) -> Int {
    return num1 - num2
}

func multiply(_ num1:Int,_ num2:Int) -> Int {
    return num1 * num2
}

//View, Present, Display

var inputButtonType = "+"

if inputButtonType == "+" {
    print("연산 결과", customPlus(a, b))
}
else if inputButtonType == "-"
{
    print(minus(a, b))
}

func calc(result: ((Int, Int) -> Int)) {
    print("연산 결과", result(a,b))
}

if inputButtonType == "+" {
    calc(result: customPlus)
}
else if inputButtonType == "-"
{
    calc(result: minus)
}