I have been trying to fix this for a long time. I have a problem which the error says Compiling... OneDfish.cpp TwoDFish.cpp C:\windows\Desktop\fish\OneDfish.cpp(9) : warning C4700: local variable ''fish'' used without having been initialized c:\windows\desktop\fish\functions.h(55) : warning C4700: local variable ''fish'' used without having been initialized C:\windows\Desktop\fish\TwoDFish.cpp(10) : warning C4700: local variable ''fish'' used without having been initialized c:\windows\desktop\fish\functions.h(55) : warning C4700: local variable ''fish'' used without having been initialized Linking... OneDfish.obj : error LNK2005: "int __cdecl Direction1(int)" (?Direction1@@YAHH@Z) already defined in Main.obj OneDfish.obj : error LNK2005: "int __cdecl Direction2(int)" (?Direction2@@YAHH@Z) already defined in Main.obj OneDfish.obj : error LNK2005: "int __cdecl Menu(class FISH)" (?Menu@@YAHVFISH@@@Z) already defined in Main.obj TwoDFish.obj : error LNK2005: "int __cdecl Direction1(int)" (?Direction1@@YAHH@Z) already defined in Main.obj TwoDFish.obj : error LNK2005: "int __cdecl Direction2(int)" (?Direction2@@YAHH@Z) already defined in Main.obj TwoDFish.obj : error LNK2005: "int __cdecl Menu(class FISH)" (?Menu@@YAHVFISH@@@Z) already defined in Main.obj Debug/Main.exe : fatal error LNK1169: one or more multiply defined symbols found Error executing link.exe. I made each ''.h'' file with the appropiate headers, and ifndef etc. I made the functions ''extern'' but i don''t know what to do. This never leaves. I cant even start the main programming until I get the intialization to work.

Try to put this on your file "OneDfish.h"



Do the same to "TwoDFish.h" but change the "ONE_FISH_HEADER" to
TWO_FISH_HEADER.

Actually you can give it the name you want, and it means that
the part between the "#if !defined" and "#endif" will only be
declared if it has not been declared before by annother "#include"

Hope it helps

Kamikaze