简单函数

func sum(x:Int,y:Int) ->Int{
   return x+y
}
let number = sum(x: 5, y: 6)
print(number)

无返回值类型的函数

func sayHelloTo(name:String,world:String){
    print("hello",name,world)
}

无参数函数

func sayHello(){
    print("nothing")
}

多个返回值的函数

func Muete(num:[Int]) ->(max:Int,min:Int,sum:Int){
    var max = num[0]
    var min = num[0]
    var sum = 0
    for temp in num {
        if temp>max {
            max = temp
        }
        if temp<min {
            min = temp
        }
        sum+=temp
    }
    return (max,min,sum)
}