Swift 变量、常量、数据类型

import Foundation

print("HelloSwift")

// 声明变量
var a = 1
var b = 2
a = 10
b = 20

// 常量
let c = a+b


var str = "Hello "
var s:String = "World"
var i:Int = 100
var words:String = "jinpangpang"

print(c)
print(str)