C language callback function, callback function

C language callback function, callback function
1 # include

2

3 void PrintNum1 (int n );

4 void PrintNum2 (int n );

5 void ShowNum (int n, void (* ptr) (int ));

6

7 void PrintMessage1 ();

8 void PrintMessage2 ();

9 void PrintMessage3 ();

10 void ShowMessage (void (* ptr )());

11

12 int main (){

13 ShowNum (11111, PrintNum1 );

14 ShowNum (22222, PrintNum2 );

15 ShowMessage (PrintMessage1 );

16 ShowMessage (PrintMessage2 );

17 ShowMessage (PrintMessage3 );

18}

19

20 void PrintNum1 (int n ){

21 printf ("Test1 is called, the number is % d \ n", n );

22}

23

24 void PrintNum2 (int n ){

25 printf ("Test2 is called, the number is % d \ n", n );

26}

27

28 void ShowNum (int n, void (* ptr )()){

29 (* ptr) (n );

30}

31

32

33 void PrintMessage1 (){

34 printf ("This is the message 1! \ N ");

35}

36

37 void PrintMessage2 (){

38 printf ("This is the message 2! \ N ");

39}

40

41 void PrintMessage3 (){

42 printf ("This is the message 3! \ N ");

43}

44

45 void ShowMessage (void (* ptr )()){

46 (* ptr )();

47}