OpenEuphoria

Re: three stupid newbie questions :-)

• Posted by Pete Lomax <petelomax at blueyonder.co.uk> Jan 20, 2004
• 435 views

On Mon, 19 Jan 2004 10:53:25 -0800 (PST), Guest
<guest at RapidEuphoria.com> wrote:

>posted by: shenpen at freemail.hu

>sequence a="hello"
>atom b=1
That's an old one. I know Karl put this in Bach (but then again, no
debugger...)
>
>while not atom(line=gets(filehandle)) 
The inner compare is a sequence operation: if both lhs and rhs are
atoms it returns pretty much what you might expect, if one is an atom,
it compares that against all the elements on the other side, if both
are sequences, they must be the same length or it stops with a fatal
error. If the lhs and the rhs are same size/shape tree then you get
back a same size/shape tree filled with 1's and 0's. FWIW I don't
think that is particularly useful and would vote to change it, but it
is a fairly core concept in the language.

You have to use either:

while 1 do
	line=gets(filehandle)
	if atom(line) then exit end if

Or:

function setline(object x)
	line = x
	return x
end function

while not atom(setline(gets(filehandle))) do



3) duplicate constants etc
	The interpreter should print a list of the sources and line
numbers on which it is defined (introduced in 2.4), at the point where
you use it and it cannot figure out which one you meant. There is an
improvement in terms of correctly guessing which one is meant, due for
2.5. You'll have to wait for the release for precise details.

Regards,
Pete