14 Apr
2007
14 Apr
'07
7:59 p.m.
-----------Original Message:
Date: Sat, 14 Apr 2007 07:51:58 -0700
From: "Chuck Guzis" <cclist at sydex.com>
Subject: Re: HP "calculators" (was Re: World's first computer on
ebay!)
Yes, it's true that BASIC doesn't differentiate lexically between the
assignment operator and equality test, but that seems to be unrelated
to the behavior of the two statements I gave. In fact, I don't know
what the operation performed by GWBASIC is in "X=Y=7".
Cheers,
Chuck
-------------Reply #2:
Maybe what's missing in my blathering is that when BASIC does a
conditional test it's actually looking for a non-zero number in whatever
its argument is, which could be a logical expression (which returns 0 or -1)
or simply a variable.
So instead of IF A <> 0 THEN... you can just say IF A THEN...,
something you'll see throughout my sloppy code ;-).
m
14 Apr
14 Apr
9:29 p.m.
On 14 Apr 2007 at 15:59, M H Stein wrote:
Maybe what's missing in my blathering is that when
BASIC does a
conditional test it's actually looking for a non-zero number in whatever
its argument is, which could be a logical expression (which returns 0 or -1)
or simply a variable.
So instead of IF A <> 0 THEN... you can just say IF A THEN...,
something you'll see throughout my sloppy code ;-).
I tried it again this afternoon and it works as you said. But last
night, I tried it over and over again in my GWBASIC and got the
results that I mentioned. No mistake--I'm certain of it--I had to
repeat it about 5 times to make sure that I wasn't imagining things.
Either that or I need to have my ginger ale tested for hallucinogens.
It DOES point out the obvious need for LET in some cases. LET X=Y=7
is different from X=Y=7.
Cheers,
Chuck
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