16.swift-func函数嵌套

//: Playground - noun: a place where people can play

import UIKit



//注意:
/*
 1.内部参数:形参
 2.外部参数:实参
 */
//行参
func sum(one:Int,two:Int)->Int{
    return one + two;
}
//实参
sum(one: 1, two: 2);



/*
 默认参数
 */
func makeCoffee(coffee:String = "雀巢")->String{
    return "制作一杯\(coffee)咖啡";
}
makeCoffee(coffee: "拿铁");
makeCoffee();

/*
 Int : 可变参数的个数
 */
func summ(nums : Int...)->Int{
    var total: Int = 0;
    for number in nums {
        total += number;
    }
    return total / Int(nums.count)
}
summ(nums: 10,9,8,7,6,5);

/*
 Double : 可变参数的个数
 */
func arithmeticMean(numbers: Double...) -> Double {
    var total: Double = 0
    for number in numbers {
        total += number
    }
    return total / Double(numbers.count)
}
arithmeticMean(numbers: 10.0000,9.00,8.00,7.00,6.00,5.00);

/*
 指针类型
 */
var m = 20;
var n = 30;
func swapNum( m:inout Int, n:inout Int) {
    var n = n;
    var m = m;
    let tmp = m;
    m = n;
    n = tmp;
}
swapNum(m: &m, n: &n);
print("m:\(m)");
print("n:\(n)");


/*1.函数嵌套*/
test();
/// 测试
func test(){
    func demo(){
        print("demo");
    }
    print("test");
    demo();
}



/// 2.函数嵌套
func testDemo() {
    test111();
}
/// 测试
func test111() {
    print("testDemo")
}
testDemo();