所有函数都出现这样类似的错误，这个是哪里出错了？急啊 - C语言论坛

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所有函数都出现这样类似的错误，这个是哪里出错了？急啊

"struct flightNode * __cdecl search(int,struct flightNode *)" (?search@@YAPAUflightNode@@HPAU1@@Z) already defined in eeeeee.obj
int __cdecl book(int,struct flightNode *)" (?book@@YAHHPAUflightNode@@@Z) already defined in eeeeee.obj
int __cdecl ask_wpassager(struct flightNode *,struct flightNode *)" (?ask_wpassager@@YAHPAUflightNode@@0@Z) already defined in eeeeee.obj
int __cdecl back_ticket(int,struct flightNode *)" (?back_ticket@@YAHHPAUflightNode@@@Z) already defined in eeeeee.obj

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