Static function declared but not defined in C++

Question

I\'m getting an error from the following code using C++.

Main.cpp

#include \"file.h\"

int main()
{
   int k = GetInteger();
   retu         


        

Answer 1

If everything is in the same translation unit it should work. You probably did not compile File.cpp into the same unit as Main.cpp.

g++ -Wall File.cpp Main.cpp

If each file is compiled separately the function must be made extern to be used from a different translation unit.

extern int GetInteger();

which is the same as

int GetInteger();