Function reference

Can I create a reference to a function, as with a variable?

If not, can I do the same thing in another way?

Do you mean a function pointer?

Code:

#include <stdio.h>

typedef void (*vpfn) (void);

void sayHi (void);
void sayBye (void);

int main (void) {
	vpfn myFn = sayHi; // NOT myFn = sayHi();
	myFn();
	printf ("And...\n");
	myFn = sayBye;
	myFn();
	
	return 0;
}

void sayHi (void) {
	printf ("Hi!\n");
	return;
}

void sayBye (void) {
	printf ("Bye!\n");
	return;
}

Code:

:!a.out                                                       
Hi!
And...
Bye!

Or if you mean something else, could you describe a bit more what you want to do?