why function pointers and call back ?

[bhadmanathan]

I read the tutorial about function pointer. I understood the syntax and concept. But..

---

Code C - [expand]
1
2
3
4
5
6
7
8
9
10
11
12
void A()
    {
        printf("HELLO");
    }
    void B(void (*p)())
    {
         p();
    }
    main()
    {
          B(A);      or       A();
    }

---

Instead of calling a function indirectly, we can simply call like A();

Is there anything in terms of memory....?



Thanks in advance

 

[enren]

Example widely used for data reception:
A is the callback function executed by an interruption.
B enable this interruption at the beginning.

 

[AdityaRajNayak]

Hi,
Just gone through following link for 'advantages of function pointers' which can be helpful.
https://www.allinterview.com/showanswers/28663/what-is-the-advantage-of-function-pointer.html