func sum(num1:Int,num2:Int,num3:Int) -> Int{
return num1 + num2 + num3;
}
sum(num1: 1, num2: 2, num3: 3)
func makeCoffee(coffeeName:String = "雀巢") -> String{
return "制作了一杯\(coffeeName)咖啡"
}
makeCoffee(coffeeName: "拿铁")
makeCoffee()
func sum2(num:Int...) -> Int {
var result = 0
for n in num {
result += n
}
return result;
}
sum2(num: 10,20,30)
var m = 30
var n = 20
func swapNum(m :inout Int, n :inout Int){
let temp = m
m = n
n = temp
}
swapNum(m: &m, n: &n)
