1. While statement
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Hello,
I have this routine in two programs. one runs ok. the other gets an error
message
" type_check failure, line is-1"
. I read in the documentation the short circuit could be involved. Is it
involved and how does it work?
jvandal
===== code===========
buffer = {}
tries = 0
countlines = 0
clear_record()
while 1 do
line = gets(Handlers)
if atom(line) then
exit
end if
line[length(line)] = 32
buffer = buffer & line
end while
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<DIV><FONT face=Arial size=2>Hello,</FONT></DIV>
<DIV><FONT face=Arial size=2>I have this routine in two programs. one runs ok.
the other gets an error message </FONT></DIV>
<DIV><FONT face=Arial size=2>" type_check failure, line is-1"</FONT></DIV>
<DIV><FONT face=Arial size=2>. I read in the documentation the short
circuit could be involved. Is it involved and how does it
work?</FONT></DIV>
<DIV><FONT face=Arial size=2>jvandal</FONT></DIV>
<DIV><FONT face=Arial size=2>===== code===========</FONT></DIV>
<DIV><FONT face=Arial size=2> buffer = {}<BR> tries =
0<BR> countlines = 0<BR> clear_record()<BR> while 1
do<BR> line = gets(Handlers)<BR> if atom(line)
then<BR> exit<BR> end
if<BR> line[length(line)] = 32<BR> buffer = buffer &
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2. Re: While statement
sixs <sixs at ida.net> wrote:
> Hello,
> I have this routine in two programs. one runs ok. the other gets an
> error message " type_check failure, line is-1".
> I read in the documentation the short circuit could be involved. Is
> it involved and how does it work?
> jvandal
> ===== code===========
> buffer = {}
> tries = 0
> countlines = 0
> clear_record()
> while 1 do
> line = gets(Handlers)
> if atom(line) then
> exit
> end if
> line[length(line)] = 32
> buffer = buffer & line
^^^^^^--- You can write this shorter, BTW:
buffer &= line
> end while
This piece of code isn't complete, the variable declarations are missing.
I assume that 'line' was declared as sequence. But if you use 'line'
this way (which is very common in Euphoria), it must be declared as
object: If 'atom(line)' is TRUE, then 'line' holds -1, otherwise 'line'
holds a sequence.
This has nothing got to do with short-circuit evaluation.
Regards,
Juergen
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3. Re: While statement
I am assuming that line is declared as a sequence. gets() can return a
sequence, which is the line, or -1 at the end of the file. In this case, it
is returning -1, which cannot be assigned to a sequence. The solution is to
declare line as an object, and then check if it is an atom, in which case,
you would exit the loop. This is already done in the code, though.
>From: sixs <sixs at ida.net>
>Subject: While statement
>
>Hello,
>I have this routine in two programs. one runs ok. the other gets an error
>message
>" type_check failure, line is-1"
>. I read in the documentation the short circuit could be involved. Is it
>involved and how does it work?
>jvandal
>===== code===========
> buffer = {}
> tries = 0
> countlines = 0
> clear_record()
> while 1 do
> line = gets(Handlers)
> if atom(line) then
> exit
> end if
> line[length(line)] = 32
> buffer = buffer & line
> end while
>
