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

import UIKit

// 定义一个数组

var userScores:[Int]? = [12, 990, 572, 3258, 9999, 1024, 666]

userScores = userScores ?? []

// 定义一个函数获取数组中最大值和最小值

// 注意: (maxScores:Int, minScores:Int)? 和 (maxScores:Int?, minScores:Int?) 是两个完全不同的表达意思

// 前者表示可选性元组, 后者表示元组中的两个值为可选性,而元组本身不是可选性

func maxminScores(scores:[Int]) -> (maxScores:Int, minScores:Int)?

{

    // 判断传进来的数组是否为空

    if scores.isEmpty {

        return nil

    }

    // 获取最大最小值

    var curMax = scores[0], curMin = scores[0]

    for score in scores[1..<scores.count] {

        curMax = max(curMax, score)

        curMin = min(curMin, score)

    }

    return (curMax, curMin)

}

if let result = maxminScores(userScores!) {

    print("The maxScores is \(result.maxScores), the minScores is \(result.minScores)")

}