#define NOARGC  /* no arg count passing */›#define FIXARGC /* don't expect arg counts passed in */›/*›** reverse string in place ›*/›reverse(s) ›char *s; ›$(›  char *j;›  int c;›  j = s + strlen(s) - 1;›  while(s < j) ›    $(›    c = *s;›    *s++ = *j;›    *j-- = c;›    $)›$)››