Re: Perl Quiz of the Week #24 (Turing Machine simulation)

On Wed, Sep 15, 2004 at 10:41:14AM -0400, colin.rafferty-/PgpppG8B+R7qynMiXIxWgC/[email protected] wrote:
> Zed Lopez wrote:
> 
> > Your program should take two parameters: the filename of a file
> > containing the state transition instructions, and the tape's initial
> > contents. The filename is required.    
> 
> > If an initial value for the tape is specified, the read/write head
> > begins over the first character of that initial value.  
> 
> I would change the specification of the program to allow for a third
> argument which is the head's initial location on the tape.  
> 
> It's value is any number, positive or negative, which specifies the
> head's position relative to the first character of the second
> argument.
> 
> By default, the third argument is 0, which is the first character of
> the initial value.

I'd say this is a perfect example of a customization that a user may
wish to apply, but this should be implemented via command-line options,
e.g.:

  perl turing.pl --start-pos 42 myprog.tm 123456_abc