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#ifdef预编译相关用法

#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

#ifdef预编译相关用法