Swift 2.0 学习第2天: 基本操作符

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

import Cocoa

var str = "Hello, playground"

/*

    一元操作符(只有一个操作数,与操作符之间不能有空格)

    二元操作符(有两个操作数)

    三元操作符(目前只有一个 ? :)

*/

/*-1-**********操作符**********/

var char:String

char = String("1") +String("2")+"\(3)"

print(char)

let temp = 5

let sum = -7

let mode = sum%temp

let shang = sum/temp

print(shang)

print(mode)

let myValue = shang*temp+mode

if myValue ==sum {

    print("数据正确 =\(myValue)")

}else {

    print("数据可能出错了..")

}

//三目运算符,简单找出最小值和最大值

let a = 78, b =98, c =65

let min = a >b ? (b >c ?c : b) : (a >c ?c :a)

let max = a >b ? (a >c ?a : c) : (b >c ?b :c)

print(min)

print(max)

//区间运算符

let arr:Array = ["0","1","2","3"]

for i in 0 ..< arr.count {//半开半闭操作符

    print(arr[i])

}

print("------------")

for i in 0...6 {//闭区间操作符

    print(i)

}

//逻辑运算符

// ! 逻辑非

// && 逻辑与

// || 逻辑或

//使用括号改变其优先级,可读性,不易出错

let x = 2, y =2, z =3

if x==3 || (y==2 &&z==3) {

    print("对了..")

}else {

    print("错了..")

}