Question

I want to write a C code, say “test.c”, and call some C++ functions from it.

I have a header file header.h which has functions defined in it
and a C++ file which has definitions of the functions.

I’m unable to figure out compilation commands and how to use the extern command.
Can someone clarify this?

Answer 1

I want to write a C code, say “test.c” call some C++ functions from it.

Try something like this in your header:

#ifdef __cplusplus
extern "C"
{
#endif
  void foo (void);
#ifdef __cplusplus
};
#endif

Then implement foo() in your .cpp file. Make sure that your .cpp file also includes the header.