WAY WAY WAY WAY OT Re: 'goto" gone from computer languages or is it!

[Vintage Computer Festival]

On Mon, 16 May 2005, Dave Dunfield wrote:

> >There's one extra local variable (char *t) which is a pointer: hardly
> >expensive by any metric.  If you prefer, move the i initializer inside the
> >for loop construct.  Same difference.
>
> >The loop uses the same number of conditionals as any other example so far
> >(including yours, which doesn't work ;)
>
> I guess you missed my original solution - look back a few messages,
> it uses only one conditional, and only one local variable, has no
> superflous assignments, nor goto's.

Saw it after I posted my "masterpiece".

> The "clever" one in my last message was an illustation, not my
> solution.

Still clever ;)

> >Your analysis somewhat (misses the point|is non-sequitur).  The unary
> >construct is the entire reason this works.
>
> It still stuffs an address into a conditional - it works, but it's
> not pretty, nowhere near the goal of "structured" (remember structured
> ... this is a song about structured) and not something I would ever
> consider using in production code.

At least I wasn't jumping into a for loop with a goto ;)

> >Perhaps this is an issue of precedence and compiler implementation, but
> >the way it works (at least under gcc) is as I suspected, which is that
> >counter i gets incremented after first being added to aryp.  So it in fact
> >iterates the entire array from start to end.
>
> * is higher precedence than '+' (K&R page 49 - I know this from memory -
> scary). If your compiler does the '+' first, it's broken.

You know, you're right.  gcc version 2.95.3.  But it worked.  I just
enclosed the expression in proper parentheses and it of course works.
Don't know why I wasn't before getting output:

1,3,5,7,9

> >You had card punches?  We had to cut holes into ours with exacto knives.
>
> Actually, when I last visited the Your university museum, the Curator
> showed me some "manual" card punches - little steel blocks with holes
> and a pin punch!

I've got something similar made by IBM.  It's a little plastic tray with a
stylus punch.  You put the card in the tray and then punch out the holes
you want.  Fun!

(And conveniently back on-topic...)

-- 

Sellam Ismail                                        Vintage Computer Festival
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