Swift语法介绍: 常量与变量
常量
//指定常量的类型
let a:Int = 1
let b:Double = 3.14
let isSuccess:Bool = true
let aString:String = "HelloSwift"
//不指定常量的类型，由编译器自动判断
let c = 2
let d = 2.1
//不可以修改常量的值
let e = 3
/* 执行报错:note: change 'let' to 'var' to make it mutable
e = 4
*/
运行结果：
变量
//指定变量的类型并赋值
var f:Int
f = a
var bString:String = "Hello"
//不指定变量的类型,根据赋值进行判断
var g = a
//修改变量的值
f = 100
g = 200
bString = "Hello Swift"
运行结果：
参考代码
https://github.com/99ios/SwiftBasic