what is the purpose of atexit function?

Question

I know when the address of the function is passed to atexit function,
the function is excuted.

#include 
int atexit(void (*fun         


        

Answer 1

#include
int atexit(void (*func)(void));

The above declaration says that we pass the address of a function as the argument to atexit. When this function is called, it is not passed any arguments and is not expected to return a value. The exit function called these functions in reverse order of their registration. Each function is called as many times as they registered.