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 }