The standard C library provides a function named atexit() that can be used to perform ?cleanup? operations when your program terminates. You can set up a set of functions you want to perform automatically when your program exits by passing function pointers to the atexit() function.

it is not at all possible to execute the code after exit the main.

Yes, It is possible execute code even after the program exits the main() function.
Explanation :-
We can crate Child Process(Thread)and make the child process to sleep and by that time, we can make the Main thread to finish its execution and exit. ( In C main() act as the Main Thread ).After the main thread exits, the child thread can run after coming from sleep state.

the atexit() function is called before exiting the main() function and it is not at all possible to carry on execution after exiting the main() function.

Using atexit() we can execute code even after exit from main program.

I think the following program will help in understanding the concept.

Here, I am initializing the function that has to be executed after exit of the main program, printing some output and calling the return, which exits the function. Later i am printing some more lines of code (which i am sure that wont be called as the function is exited). Once the function exits, it will call the funcion which is initialized using atexit().

#include<stdio.h>

void myFunction_Onexit()
{
printf(" Welcome to user exit function. Here u can do anything ");
system("pause");
}
int main()
{

printf(" In main function before return ");
atexit(myFunction_Onexit);
system("pause");
return 0;
printf(" In main function after return ");
system("pause");
return 0;

}

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