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Strings

It's possible to add characters to a string. However,Swift's strictness with types means you have to be explicit when doing so,just as you have to be when you work with numbers if one is anIntand the other is aDouble.

To add a character to a string,you do this:

let exclamationMark: Character = "!"
var message = "Hello" + " my name is Matt"
message += String(exclamationMark)  

（编辑：李大同）

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