How do I source/link external functions in C or C++?

Question

EDIT: I suppose I should clarify, in case it matters. I am on a AIX Unix box, so I am using VAC compilers - no gnu compilers. End edit

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Answer 1

You've got a third option. In general, your C++ compiler should be able to link C routines. The necessary options may vary from compiler to compiler, so R your fine M, but basically, you should be able to compile with g++ as here:

$ g++ -o myapp myapp.cpp myfunc.c giveint.c

... or compile separately

$ gcc -c myfunc.c
$ gcc -c giveint.c
$ g++ -c myapp.cpp
$ g++ -o myapp myapp.o myfunc.o

You also need to include your declaration of the functions; you do that in C++ as

extern "C" {
    int myfunc(int,int);
    int giveInterger(void);
}