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15th-day notes (operations on OC NSDate) and iosnsdate for IOS

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[Study Notes] the inclusion of the [C Language] file and the C language of study notes

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[Study Notes] [C Language] functions of static and extern, staticextern

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IOS-Get Model (device Model), Version (device Version), app (program Version), etc.

IOS-Get Model (device Model), Version (device Version), app (program Version), etc.IOS-Get Model (device Model), Version (device Version), app (program Version), etc. NSLog (@ uniqueIdentifier: % @, [[UIDevice currentDevice]

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