DDE: Call C functions from C++ app?

Is it possible to create a mixed C/C++ app with the DDE? For example, can I do something like this (pseudocode):

hello.c:
void hello(void)
{
  printf("Hello from C\n);
}

main.c++:
int main(void)
{
  cout << "Hello from C++\n";
  hello();
}

When I try to link both object files into my !RunImage, it tells me that hello(void) is an undefined symbol. Is there a way to get this working, or is it not possible? Are there any examples available anywhere?

Sorry that this is a bit vague; if someone can confirm whether it’s possible to interwork C and C++ then I can provide the specific makefile and exact output from Link (it’s just a bit of a hassle to post at present).

You need to bracket the function declarations with extern "C" {…}, as shown below, to stop the names being mangled in c++.

hello.h:

#ifdef __cplusplus
extern "C" {
#endif

void hello();

… more functions

#ifdef __cplusplus
}
#endif

hello.c:
void hello(void)
{
  printf("Hello from C\n);
}

main.c++:
int main(void)
{
  cout << "Hello from C++" << endl;
  hello();
}

Thanks. It’s so blatantly obvious now that you’ve said it!

I have noticed that in some libraries the extern “C” is missing (example unicode.y.utf8). DDE with shared makefiles works well with C and C++.
(The STL too)