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forum.gifForum - iziBasic - Topic #1547

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Warning: A non-numeric value encountered in /web5/aldweb/www/aldweb_com/www/thread.php on line 257

active  Topic # 1547  Negative variables

05/06/2007 @ 20:37
by Valentin

Anonymous
Hello

I am a new user of IziBasic, and I am trying to test a cuadratic equation, so when I put:

x = -b + sqrt(b^2-(4*a*c)

a sintax Error exist.

And when I tryed to use NUMFIELD I can't put a negative value

What I doing wrong?

Thanks for your help
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Warning: A non-numeric value encountered in /web5/aldweb/www/aldweb_com/www/thread.php on line 497
Answer n° 1
--------
05/06/2007 @ 22:10
by aldweb

Anonymous

visitor
 Hello Valentin,

Try something like this:
x=b^2-4*a*c : x=sqrt(x)-b

It is expected that sqrt(b^2-4*a*c) returns a syntax error as only a sqrt(x) kind of syntax is valid in iziBasic.
Now, x=-b+sqrt(x) should not return a syntax error, I don't get why it does in this specific case. Maybe one fix to apply somewhere in the math parser...

Cheers,
aldweb

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Warning: A non-numeric value encountered in /web5/aldweb/www/aldweb_com/www/thread.php on line 497
Answer n° 2
--------
06/06/2007 @ 22:37
by Valentin

Anonymous

visitor
 Hola


Thank s for your response,
I am really enjoing to programing in IziBasic,

When I use a NUMFIELD I can´t write a negative number on this field. (I am using ViziBasic)

Do I miss somthing?

Thanks Again
Valentin
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Warning: A non-numeric value encountered in /web5/aldweb/www/aldweb_com/www/thread.php on line 497
Answer n° 3
--------
10/06/2007 @ 18:58
by aldweb

Anonymous

visitor
 Hello Valentin,

NUMFIELD only works with positive numbers, this is a limitation of the underlying Palm OS API call, not an iziBasic bug.

To proceed with negative numbers in fields, give a look to Topic #1534.

Cheers,
aldweb
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Warning: A non-numeric value encountered in /web5/aldweb/www/aldweb_com/www/thread.php on line 497
Answer n° 4
--------
11/06/2007 @ 15:35
by Valentin

Anonymous

visitor
 Thanks, now it works. (Was an obvious solution if I was reading carefuly the manual)
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Warning: A non-numeric value encountered in /web5/aldweb/www/aldweb_com/www/thread.php on line 497
Answer n° 5
--------
12/06/2007 @ 21:59
by aldweb

Anonymous

visitor
 (indeed...)

Cheers,
aldweb
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