2018.08.31 10:57 swift 学习心得

　　其实我一直很喜欢swift，我觉得Xcode很先进，买了一台MacBook就可以操作了，蛮好的。

var str = "Hello, playground"
var myVariable = 42
myVariable = 50
let myConstant = 42
let implicitInteger = 70
let implicitDouble = 70.0
let explicitDouble: Double = 70
let label = "The width is "
let width = 94
let widthLabel = label + String(width)
let apples = 3
let oranges = 5
let appleSummary = "I have (apples) apples."
let fruitSummary = "I have (apples + oranges) pieces of fruit."

swift代码