#define NOARGC  /* no argument count passing */›#define FIXARGC /* don't expect arg counts passed in */›#include <stdio.h>›/*›** Close fd ›** Entry: fd = File descriptor for file to be closed.›** Returns NULL for success, otherwise ERR›*/›fclose(fd)›int fd; ›$(›/*›  if (close(fd) >= 0)›    return(NULL);›   else›    return(ERR);› ... we can do better than that... */››  return(close(fd) >= 0 ? NULL : ERR);›$)››