[U2] Forcing a boolean comparison?

[jjuser ud2]

Good evening,

In UniBasic, does a statement like:

isTRUE=(TRUE<12>="Y")

force a boolean comparison instead of an assignment, such that isTRUE
is assigned a 1 or 0 as a value?
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RE: [U2] Forcing a Boolean comparison?

[Bob Woodward]

I use this method quite frequently.  One of the things I just did was
something like that:

DL.TOP = CLINE - INT(WDEPTH/2)
DL.BOT = CLINE + INT(WDEPTH/2) + (REM(WDEPTH/2) NE 0)

The last part is going to give me either a 0 or a 1 depending on the odd
or even value of WDEPTH. I now have which lines to display above and
below my current line.  There's more to that calculation but it gives an
example of what you're wanting to do.

HTH's

BobW
 
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of jjuser ud2
Sent: Wednesday, September 20, 2006 3:55 PM
To: u2-users@listserver.u2ug.org
Subject: [U2] Forcing a boolean comparison?

Good evening,

In UniBasic, does a statement like:

isTRUE=(TRUE<12>="Y")

force a boolean comparison instead of an assignment, such that isTRUE
is assigned a 1 or 0 as a value?
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RE: [U2] Forcing a boolean comparison?

[Kevin King]

>In UniBasic, does a statement like:
>isTRUE=(TRUE<12>="Y")
>force a boolean comparison instead of an 
>assignment, such that isTRUE is assigned 
>a 1 or 0 as a value?

Yes.  Note that historically the name TRUE has been a favored equate
name, ala:

EQU TRUE TO 1

...or defined as a variable denoting truth:

TRUE = (1 EQ 1)

...therefore exercise caution with this word as a variable name when
modifying legacy code.  Also, note that I personally prefer the two
letter comparators (EQ, NE, etc.) to improve readability as it
provides some differentiation between the assignment and comparator
operators.

-Kevin
[EMAIL PROTECTED]
http://www.PrecisOnline.com
 
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Re: [U2] Forcing a boolean comparison?

[Jeff Butera]

On Wed, 20 Sep 2006, jjuser ud2 wrote:


In UniBasic, does a statement like:
isTRUE=(TRUE<12>="Y")
force a boolean comparison instead of an assignment, such that isTRUE
is assigned a 1 or 0 as a value?


Yes.  The following outputs '2 0'

X = 2
Z = (X = 3)
PRINT X:' ':Z

Jeff Butera, Ph.D.
Administrative Systems
Hampshire College
[EMAIL PROTECTED]
413-559-5556

"You're not right, Daddy"
   my 3-year old showing her wisdom
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Re: [U2] Forcing a boolean comparison?

[jjuser ud2]

Thanks, everybody who replied!  I couldn't find the documentation
anywhere, but it looks like that's what it did :)  On the other hand,
there's just so much documentation to search through that I sometimes
have a tough time.

On 9/20/06, Jeff Butera <[EMAIL PROTECTED]> wrote:

On Wed, 20 Sep 2006, jjuser ud2 wrote:

> In UniBasic, does a statement like:
> isTRUE=(TRUE<12>="Y")
> force a boolean comparison instead of an assignment, such that isTRUE
> is assigned a 1 or 0 as a value?

Yes.  The following outputs '2 0'

X = 2
Z = (X = 3)
PRINT X:' ':Z

Jeff Butera, Ph.D.
Administrative Systems
Hampshire College
[EMAIL PROTECTED]
413-559-5556

"You're not right, Daddy"
my 3-year old showing her wisdom
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RE: [U2] Forcing a boolean comparison?

[Raymond DeGennaro II]

At 18:14 -0600 2006/09/20, Kevin King wrote:
Also, note that I personally prefer the two letter comparators (EQ, 
NE, etc.) to improve readability as it provides some differentiation 
between the assignment and comparator operators.


Allong these lines, I try to use a technique from my C days:  Put the 
constant on the left:

"Y" = theVar
This way, if something happens and the boolean context is lost, 
you'll get a compiler error and not a hidden assignment that could be 
hard to find.  It's not as useful because mvBASIC doesn't use == for 
comparison and = for assignment, so you're less likely to have and 
accidental assigment, but it doesn't hurt, if you can develop the 
habit.


Ray
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RE: [U2] Forcing a boolean comparison? {unclassified}

[HENDERSON MIKE, MR]

Yes

Better still, 
isTRUE=TRUE<12>="Y" 
Works the same and can be tricky to find when the second "=" is a typo
for adjacent or shifted keys "-" or "+"
:-(

Which is why I much prefer to see
isTRUE = @FALSE
IF TRUE<12> EQ "Y" THEN isTRUE = @TRUE

As a convention, I always use "=" for assignment only and "EQ" for
comparison


Mike

> -Original Message-
> From: [EMAIL PROTECTED] 
> [mailto:[EMAIL PROTECTED] On Behalf Of jjuser ud2
> Sent: Thursday, 21 September 2006 10:55
> To: u2-users@listserver.u2ug.org
> Subject: [U2] Forcing a boolean comparison?
> 
> Good evening,
> 
> In UniBasic, does a statement like:
> 
> isTRUE=(TRUE<12>="Y")
> 
> force a boolean comparison instead of an assignment, such 
> that isTRUE is assigned a 1 or 0 as a value?
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