Function Pointers and Callbacks in C

 Function Pointers and Callbacks

Function pointers allow you to create variables that can store the address of functions. This enables dynamic function invocation and can be used for implementing callback mechanisms.

#include <stdio.h>

void greet() {

    printf("Hello!\n");

}

void farewell() {

    printf("Goodbye!\n");

}

void invoke(void (*function)()) {

    function();

}

int main() {

    void (*callback)();  // Function pointer declaration

    callback = greet;    // Assign address of greet function

    invoke(callback);    // Call greet function through function pointer

    callback = farewell; // Assign address of farewell function

    invoke(callback);    // Call farewell function through function pointer

    return 0;

}