#include <stdio.h>

void call_back_func0() { printf("callback function 0 called\n"); }
void call_back_func1() { printf("callback function 1 called\n"); }
void call_back_func2() { printf("callback function 2 called\n"); }
void call_back_func3() { printf("callback function 3 called\n"); }

enum event_type { EVENT0 = 0, EVENT1, EVENT2, EVENT3, EVENT_MAX };

void (*func[])(void) = {
    call_back_func0,
    call_back_func1,
    call_back_func2,
    call_back_func3,
};

void handle_event(int event_type, void (*callback)(void)) {
  printf("event %d occured\n", event_type);

  if (callback) {
    callback();
  }
}

void func_ptr_demo() {
  for (int idx = 0; idx < EVENT_MAX; idx++) {
    func[idx]();
  }
}