1 extern void a(void); 2 extern void b(void); 3 dummy(void)4 void dummy (void) 5 { 6 a(); 7 } 8 int compare(void (* f)(void))9 compare (void (*f)(void)) 10 { 11 return a == f; 12 } 13 int main(void)14 main (void) 15 { 16 b (); 17 return 0; 18 } 19