頭文件中常量前有__或_是什麼意思？ 頭文件中常量前有__或_是什麼意思？ example : #ifdef __USE_MISC #ifndef _LINK_H #define _LINK_H 1 請幫助！先謝了。 頭文件中常量前有__或_是什麼意思？ source from MSDN For ANSI compliance, these keywords are prefaced by a double underscore. For backward compatibility, single-underscore versions of all the keywords except __except, __finally, __leave, and __try are supported. In addition, __cdecl is available with no leading underscore. [ 關閉窗口 ]