> % 91/05/24 Brian {Hamilton Kelly}, checking that the programs would work
> % under VAX/VMS, replaced the line reading
>   FILE *f1,*f2;
> % in each source with these lines
>   FILE *f1=(FILE *) NULL;
>   FILE *f2=(FILE *) NULL;
> % (In C, there's no guarantee that automatic variables will have _any_
> % particular value, let alone the (FILE *)NULL that was necessary here
> % with the method the program uses to prompt for missing command-line
> % arguments.  Perhaps he was just lucky with his Unix & DOS :-)