Swift学习笔记1

/**
*  打印用print()
*
*/
print("Hello, World!")

/**
*  声明变量用var
*
*  声明常量用let
*/
var myVariable = 42
myVariable = 50
let myConstant = 42


//Swift可以类型推断
let implicitInteger = 70
let implicitDouble = 70.0
let explicitDoule: Double = 70

// 字符串
let label = "The width is "
let width = 94

// 字符串与整型常量拼接
let widthLabel = label + String(width)
print(widthLabel)