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#ifdef预编译相关用法主要有:
(1)#ifdef XXX
   executing the corresponding xxx code
   #endif
(2)#ifdef XXX
   executing the corresponding xxx code
   #else
   executing the other code
(3)#ifdef XXX
   executing the corresponding xxx code	
   #elifdef YYY
   executing the corresponding yyy code
   #else
   executing the other code
   #endif
注意最后要使用#endif结束
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原文地址:http://www.cnblogs.com/gjianw217/p/4196368.html