Re: Length
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Hi Thomas,
I can understand the problems you have in learning Euphoria, since I =
remember having about the same ones, when I first tried writing my own =
programs (In a previous age, that was)
However, you make some semantic errors!
1) When you type a '9' you see a character 9 on your screen. But the =
internal code for this character is 57. You can see this by executing =
the statement: ? '9'
A way to 'translate' it into a number is subtracting 49, being the value =
of '0'.
desc -=3D '0'
2) The program cannot determine the length of an 'atom', only sequences =
have lengths. You do not need the length() function here. Instead you =
should use:
for i =3D 1 to desc do
puts(1, '0')
end for
Your second question: gets(0) reads from the keyboard. You type '9' and =
then ENTER. If you should use ? desc now, you would get {57,10}.
These are the internal values for the keys you pressed. To extract only =
the number key, use:
desc =3D desc[1]
So, your program could look like this:
object desc
puts(1,"Enter a number from 1-9 ") -- neater to have a space before =
input
desc =3D gets(0) -- lowlevel I/O, C =
programmers call this
desc =3D desc[1]
desc -=3D '0'
for i =3D 1 to desc do
puts(1, '0')
end for
To have extra line feeds in your output, use puts(1, '\n') between some =
of these lines.
Hope this helps, Ad
----- Oorspronkelijk bericht -----=20
Van: Paul Kerslake=20
Aan: EUPHORIA at LISTSERV.MUOHIO.EDU=20
Verzonden: woensdag 6 september 2000 23:56
Onderwerp: Length
I was wondering if there's a way to use length in a loop:
object desc
puts(1,"Enter a number from 1-9)
desc=3Dwait_key()
for length(desc) do -- if desc is 9 then puts 0 nine =
times.
puts(1,"0")
end for
Also, is there a way to eliminate the enter key number stored in any =
gets(0) vairable?
-Thanks
-Thomas
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<BODY bgColor=3D#ffffff>
<DIV>Hi Thomas,</DIV>
<DIV> </DIV>
<DIV>I can understand the problems you have in learning Euphoria, since =
I=20
remember having about the same ones, when I first tried writing my own =
programs=20
(In a previous age, that was)</DIV>
<DIV>However, you make some semantic errors!</DIV>
<DIV>1) When you type a '9' you see a character 9 on your screen. But =
the=20
internal code for this character is 57. You can see this by executing =
the=20
statement: <STRONG>? '9'</STRONG></DIV>
<DIV>A way to 'translate' it into a number is subtracting 49, =
being=20
the value of '0'.</DIV>
<DIV><STRONG>desc -=3D '0'</STRONG></DIV>
<DIV>2) The program cannot determine the length of an 'atom', only =
sequences=20
have lengths. You do not need the length() function here. Instead =
you=20
should use:</DIV>
<DIV><STRONG>for i =3D 1 to desc do</STRONG></DIV>
<DIV><STRONG> puts(1, '0')</STRONG></DIV>
<DIV><STRONG>end for</STRONG></DIV>
<DIV> </DIV>
<DIV>Your second question: gets(0) reads from the keyboard. You type '9' =
and=20
then ENTER. If you should use <STRONG>? desc </STRONG>now, you would get =
{57,10}.</DIV>
<DIV>These are the internal values for the keys you pressed. To extract =
only the=20
number key, use:</DIV>
<DIV><STRONG>desc =3D desc[1]</STRONG></DIV>
<DIV> </DIV>
<DIV>So, your program could look like this:</DIV>
<DIV> </DIV>
<DIV><STRONG>object desc</STRONG></DIV>
<DIV><STRONG>puts(1,"Enter a number from 1-9 ") -- =
neater to=20
have a space before input</STRONG></DIV>
<DIV><STRONG>desc =3D gets(0) =20
=
=20
-- lowlevel =
I/O, C=20
programmers call this</STRONG></DIV>
<DIV><STRONG>desc =3D desc[1]</STRONG></DIV>
<DIV><STRONG>desc -=3D '0'</STRONG></DIV>
<DIV><STRONG>for i =3D 1 to desc do</STRONG></DIV>
<DIV><STRONG> puts(1, '0')</STRONG></DIV>
<DIV><STRONG>end for</STRONG></DIV>
<DIV> </DIV>
<DIV>To have extra line feeds in your output, use puts(1, '\n') between =
some of=20
these lines.</DIV>
<DIV> </DIV>
<DIV>Hope this helps, Ad</DIV>
<BLOCKQUOTE=20
style=3D"BORDER-LEFT: #000000 2px solid; MARGIN-LEFT: 5px; MARGIN-RIGHT: =
0px; PADDING-LEFT: 5px; PADDING-RIGHT: 0px">
<DIV style=3D"FONT: 10pt arial">----- Oorspronkelijk bericht ----- =
</DIV>
<DIV=20
style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>Van:</B>=20
<A href=3D"mailto:paulk at UNISERVE.COM" title=3Dpaulk at UNISERVE.COM>Paul =
Kerslake</A>=20
</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Aan:</B> <A=20
href=3D"mailto:EUPHORIA at LISTSERV.MUOHIO.EDU"=20
title=3DEUPHORIA at LISTSERV.MUOHIO.EDU>EUPHORIA at LISTSERV.MUOHIO.EDU</A> =
</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Verzonden:</B> woensdag 6 september =
2000=20
23:56</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Onderwerp:</B> Length</DIV>
<DIV><BR></DIV>
<DIV><FONT face=3DArial size=3D2>I was wondering if there's a way to =
use length in=20
a loop:</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=3DArial size=3D2>object desc</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>puts(1,"Enter a number from =
1-9)</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>desc=3Dwait_key()</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>for length(desc) do =
-- if desc is =
9 then=20
puts 0 nine times.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>puts(1,"0")</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>end for</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=3DArial size=3D2>Also, is there a way to eliminate the =
enter key=20
number stored in any gets(0) vairable?</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=3DArial size=3D2>-Thanks</FONT></DIV>
<DIV><FONT face=3DArial =
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