Swift

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

import UIKit

var str = "Hello, playground"

let orangeAreYellowColor = true
let appleIsBlue = false

if orangeAreYellowColor {
    print("yes! The orange is Yellow Color.")
} else {
    print("no! The orange is not Yellow")
}

let i = 1
if (i == 2) {
    print("i等于2");
} else {
    print("i等于(i)")
}

// swift中是没有这种语法的
if i {
    
}

// 布尔类型其实说的就是对和错, true和false..