OpenEuphoria

Re: Suggestion for conditional loops

• Posted by "Kat" <gertie at visionsix.com> Jul 15, 2005
• 453 views

On 15 Jul 2005, at 11:59, Juergen Luethje wrote:

> 
> 
> Hi all,
> 
> I'd like to suggest a new syntax for conditional loops:
> 
> Use "loop" or something similar (rather than "end while") to denote the
> end of a conditional loop, also allow conditional loops without a while
> statement. So the basic conditional loop would look like:
>    do
>       <command_1>
>       <command_2>
>       ...
>    loop

Didn't we call those "repeat-until" loops? 
Been asked for, RobC said no.

Kat


> rather than currently
>    while 1 do
>       <command_1>
>       <command_2>
>       ...
>    end while
> 
> 
> Then allow a while statement at the beginning *or at the end* of the
> loop:
>    while x < 2 do
>       <command_1>
>       <command_2>
>       ...
>    loop
> 
> 
>    do
>       <command_1>
>       <command_2>
>       ...
>    loop while x < 2
> 
> 
> The advantage is in the last case, where we currently have to write:
>    while 1 do
>       <command_1>
>       <command_2>
>       ...
>       if x >= 2 then
>          exit
>       end if
>    end while
> 
> 
> The problems concerning compatibility are little, we just would have to
> replace "end while" with "loop" in existing programs.
> 
> But I don't know whether this would require big changes in the parser.
> Also, we now always have "end <keyword>" (end if, end for, end function, ...).
> Using "do/loop" instead of "while/end while" would introduce an exception, so
> I
> don't know whether this actually ia good idea. But at least I wanted to tell
> you
> for discussion.
> 
> Regards,
>    Juergen
> 
> -- 
> Have you read a good program lately?
> 
> 
> 
>