C Tutorial/stdlib.h/atexit

atexit

Item Value Header file stdlib.h Declaration int atexit(void (*func)(void)); Function causes the function pointed to by func to be called upon normal program termination. Return returns zero if the function is successfully registered as a termination function and nonzero otherwise.

At least 32 termination functions can be registered, and they will be called in the reverse order of their registration.

#include <stdlib.h>
  #include <stdio.h>
  void done(void);
  int main(void)
  {
    if(atexit(done)){
          printf("Error in atexit().");
    }
    return 0;
  }
  void done(void)
  {
    printf("Hello There");
  }