| c中的32个关键字 auto double int struct break else long switch 
 case enum register typedef char extern return union 
 const float short unsigned continue for signed void 
 default goto sizeof volatile do if while static 
 oc中的关键字 @interface @implementation @end @public @protected @private @selector @try @catch  @throw @finally @protocol @optional @required @class @property @synthesize @dynamic BOOL Class SEL YES NO id self super nil atomic nonatomic retain assign copy block ... 由于oc向下兼容 c中的关键字在oc中也能使用~~~ 
 
 如有遗漏  欢迎补缺~~~ 
 
 
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