Atexit() - C library function Program

Declaration :

int atexit(void (*func)(void))

Explanation :

Purpose	The C library function *int atexit(void (func)(void)) causes the specified function func** to be called when the program terminates. You can register your termination function anywhere you like but it will be called at the time of program termination.
Parameters	func ===> This is the function to be called at the termination of the program.
Return Value	This function returns a zero value if the function is registered successfully otherwise a non-zero value if it is failed.
Exception

C Program : Example

The following example shows the usage of atexit() function.

#include 
#include 
void functionA ()
{
   printf("This is functionA\n");
}
int main ()
{
   /* register the termination function */
   atexit(functionA );
   printf("Starting  main program...\n");
   printf("Exiting main program...\n");
   return(0);
}