求助 Main.obj : error LNK2001:
--------------------Configuration: Main - Win32 Debug--------------------
Linking...
Main.obj : error LNK2001: unresolved external symbol "public: __thiscall Fish::Fish(void)" (??0Fish@@QAE@XZ)
Debug/Main.exe : fatal error LNK1120: 1 unresolved externals
Error executing link.exe.
Main.exe - 2 error(s), 0 warning(s)
请高手指点这是什么错误啊 怎么修改啊