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Atexit

Item Value Header filestdlib.h Declarationint atexit(void (*func)(void)); Functioncauses the function pointed to by func to be called upon normal program termination. Returnreturns 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");   } Hello There