callback function in C

A callback function is basically any executable code passed as a parameter to other code that is expected to be called or executed at a specific time. We can define it in other words as follows: If a reference to a function is passed as a parameter to another function to call, it is called a callback function.

In C language, we must use function pointers to call callback functions. The following code shows how the callback function performs its task.

Sample code

#include void my_function() { printf("This is a normal function."); } void my_callback_function(void (*ptr)()) { printf("This is callback function.
"); (*ptr)(); //calling the callback function } main() { void (*ptr)() = &my_function; my_callback_function(ptr); }

Output

This is callback function. This is a normal function.

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