/*   This is an important file for managing the project.   It implements the canoncial "Hello World" program.   Filename: $RCSfile$*/#include <stdlib.h>#include <stdio.h>static char *RCSinfo = "$Id$";int main(){    printf("Hello World\n");    printf("This is an extra line added later\n");    printf("This file is under RCS control.  Its ID is \n%s\n", RCSinfo);    exit (EXIT_SUCCESS);}