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Skit3000
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Joined: 11 May 2002
Posts: 2166
Location: The Netherlands
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 Posted: Sat Nov 23, 2002 11:21 pm Post subject: Error 25... |
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Hi all,
I was just making a boring program to valide 'postbank' numbers, when I hit a real strange error. It says that the number is Non-numeric... Can't find the mistake, so I think it is be a bug...
| Code: | %%pasnummer = 523456789
%z = 1
repeat
%%number = @prod(@substr(%%pasnummer,%z,%z),%z)
%%test = @fadd(%%number,%%test)
%z = @succ(%z)
until @equal(%z,9) |
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Garrett
Moderator Team
Joined: 04 Oct 2001
Posts: 2149
Location: A House
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| Posted: Sat Nov 23, 2002 11:45 pm Post subject: |
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Try replacing the @prod() with the floating point equivalent instead. which
is what, @fdiv()?.
-Garrett |
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Mac
Professional Member
Joined: 08 Jul 2000
Posts: 1585
Location: Oklahoma USA
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| Posted: Sat Nov 23, 2002 11:48 pm Post subject: |
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No bug...
You forgot to init %%test with a value.
I'm moving this to the General Help Section,
we should post suspected bugs there first...
Cheers, Mac 
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Skit3000
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Mac
Professional Member
Joined: 08 Jul 2000
Posts: 1585
Location: Oklahoma USA
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| Posted: Sun Nov 24, 2002 12:15 pm Post subject: |
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Not really, but you can use empty vars if you're
not using floating point math functions... 
Cheers, Mac
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Tommy
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Joined: 16 Nov 2002
Posts: 746
Location: The Netherlands
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| Posted: Sun Nov 24, 2002 5:08 pm Post subject: |
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If using loops, it is a good practice with any programming language to initialize all
variables which will be used in the loop. |
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Tsunami1988
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Joined: 15 Aug 2002
Posts: 70
Location: The Netherlands
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| Posted: Sat Nov 30, 2002 6:40 pm Post subject: |
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| skit3000 wrote: | Hi Mac,
If you are doing maths, and you have a sum like this:
X =
Y = X + 1
Then the answer is 1. But why does VDS need a X = 0? That a little strange, isn't it? |
this is because sets X to null, not 0. |
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DoT_PiTcH
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Joined: 07 Aug 2002
Posts: 85
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| Posted: Sun Dec 01, 2002 2:26 am Post subject: |
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not nessisarily
X =
could mean x = anything
like in pascal, there is no standard....
i believe VDS is this way to considering it was writing in delphi(OO pascal) |
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PGWARE
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Joined: 29 Dec 2001
Posts: 1565
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| Posted: Sun Dec 01, 2002 3:38 am Post subject: |
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| Not necessarily, in Delphi variables are defined by types (strings, integers, etc) in VDS they are all strings even if they contain only numbers it's still evaluated as a string. |
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Tsunami1988
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Joined: 15 Aug 2002
Posts: 70
Location: The Netherlands
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| Posted: Sun Dec 01, 2002 10:22 am Post subject: |
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| DoT_PiTcH wrote: | not nessisarily
X =
could mean x = anything
like in pascal, there is no standard....
i believe VDS is this way to considering it was writing in delphi(OO pascal) |
it could be, but I believe that sets X to null. |
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FreezingFire
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Joined: 23 Jun 2002
Posts: 3508
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| Posted: Sun Dec 01, 2002 2:28 pm Post subject: |
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Try this script:
| Code: | %X =
if @equal(%X,0)
warn "%X = 0"
end
if @null(%X)
warn "%X is null"
end
exit |
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Tsunami1988
Contributor
Joined: 15 Aug 2002
Posts: 70
Location: The Netherlands
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| Posted: Sun Dec 01, 2002 2:38 pm Post subject: |
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| FreezingFire wrote: | Try this script:
| Code: | %X =
if @equal(%X,0)
warn "%X = 0"
end
if @null(%X)
warn "%X is null"
end
exit |
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I told you it was null  |
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vdsalchemist
Admin Team
Joined: 23 Oct 2001
Posts: 1448
Location: Florida, USA
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| Posted: Sun Dec 01, 2002 5:03 pm Post subject: |
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Actually all,
VDS does not allocate an empty variable and this can be proven with a simple VDS script.
Consider the following code.
| Code: |
%Y = 2
%X =
%Z = @Prod(%Y,%X)
Info Z = %Z@Cr()Y = %Y@Cr()X = %X
Rem Now lets inspect each variable
Info The Length of Z = @Len(%Z)@CR()ASCII value of Z = @ASC(%Z)
Info The Length of Y = @Len(%Y)@CR()ASCII value of Y = @ASC(%Y)
Rem The next line should give you an error after the Info box is shown
Info The Length of X = @Len(%X)@CR()ASCII value of X = @ASC(%X)
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Not that this is a bug in VDS but rather this: A VDS floating point function has to make sure that the values passed to it is numeric becuase of the decimal point or comma. I am no Math expert but is this not true Value times Nothing is still nothing right, Value plus Nothing is Value, Value minus Nothing is Value? Now if you tried Value divided by Nothing you will get a VDS error 26 "Arithmetic error" and that is because you cannot divide by nothing....So in the case of division this is an underflow error but not a divide by zero error eventhough VDS treats both with the same error number.
And there you have the rest of the story
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PGWARE
Web Host
Joined: 29 Dec 2001
Posts: 1565
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| Posted: Sun Dec 01, 2002 5:22 pm Post subject: |
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| I think in math you use 0 as the equivalent to 'nothing', in vds if you use a blank variable x = " " that simply is not the same as using 0. |
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FreezingFire
Admin Team
Joined: 23 Jun 2002
Posts: 3508
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| Posted: Sun Dec 01, 2002 5:27 pm Post subject: |
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%A = "" is the same thing as %A =
You can see the length of that, zero indicating a length of zero characters, meaning "null". Here's a quote taken from dictionary.com:
Null is defined as "Zero; nothing," so in this case, the length of the var without data is returned "zero".
| Code: | %A = " "
%B = ""
%C =
%A = @len(%A)
%B = @len(%B)
%c = @len(%c)
info %a;%b;%c |
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