OpenEuphoria

Re: goto: it's conceded

• Posted by Derek Parnell <ddparnell at bigpond?com> Jun 02, 2008
• 683 views

ken mortenson wrote:
> 
> Derek Parnell wrote:
>  
> > David Cuny wrote:
> > > Well, sometimes you're nested deep, and you need to get out. Implementing
> > > it
> > > 
> > > without GOTO is messy and error prone. With GOTO, it's clear
> > > what's happening and it executes as expected.
> 
> Sorry to contradict you 

I assume 'you' here means David and not myself.

> but your example demostrates perfectly (with some
> elaboration) exactly why GOTO result in less clear code. 

> Thank you 

I assume 'you' here means myself and not David.

> for providing an example that allows me to make this point...


>  
> > We can now do this (in V4.0) ...
> > 
> >    while cond1 label "toplevel" do
> >       . . .
> >       while cond2 do
> >        . . .
> >          while cond3 label "anotherpoint" do
> >            . . .
> >             while cond4 do
> >               . . .
> >               if abc then
> >                   exit "toplevel"
> >               else
> >                   continue "anotherpoint"
> >               end if
> >             end while
> >         end while
> >      end while
> >    end while
> 
> Any person that wrote this probably expects...
> 
> while cond4 do
> 
> ...to be the beginning of a loop.  Does everybody see that?

AARRRRGG!!! You missed the point ken. Okay, in this example which I spent all of
5 seconds writing, I missed a minor part which would help my case more. The
example should have been written ...

    while cond1 label "toplevel" do
       . . .
       while cond2 do
        . . .
          while cond3 label "anotherpoint" do
            . . .
             while cond4 do
               . . .
               if cond5 then
                   exit "toplevel"
               end if
               . . .
               if cond6 then
                   continue "anotherpoint"
               end if
               . . .
             end while
             . . .
         end while
         . . .
      end while
      . . .
    end while


I was JUST trying to show that the NEED for goto in v4.0 is not as great, IN
THIS SITUATION, as one might have thought. That's all.

-- 
Derek Parnell
Melbourne, Australia
Skype name: derek.j.parnell