swift语法入门 4

字符串

• 空字符串

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  var str = "Mtax" if str.isEmpty{ print("empty string") } else{ print("not empty") }

• 字符串插值

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  var varA = 20 let constA = 100 var varC:Float = 20.0 var stringA = "(varA) times (constA) is equal to (varC * 100)" print( stringA )

• 字符串相加

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  let aa = "Hello," let bb = "World!" var aabb = aa + bb print(aabb) // Hello,World!