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DarkBASIC Professional Discussion / NOT command problem

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MrTAToad
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Posted: 20th Sep 2002 18:35
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The following :

PRINT NOT 1
WAIT KEY

produces a nice Application could not be read error.

Anyone else have this problem ?
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DeathShadow
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Posted: 20th Sep 2002 18:50
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what is 'print not 1' supposed to mean exactly?

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MrTAToad
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Posted: 20th Sep 2002 18:58
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It should print either print 0 or -1, depending of how you deal with negative values (C prints 0 for example).

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DeathShadow
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Posted: 20th Sep 2002 18:59
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i dont think 'print not 1' makes sense in basic. maybe db thinks it is fairly weird instruction as well

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MrTAToad
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Posted: 20th Sep 2002 19:16
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Its useful for getting the negative of something - it certainly should crash like it did!

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Zep
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Location: From PA, USA. Currently reside in Hanoi, Vietnam
Posted: 20th Sep 2002 19:37
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NOT is not included as an Operator (in db 1.13 at least) Are you sure it's included in DB PRO?

And NOT does not return the negative of something, more like the opposite of something, it returns a TRUE (1) or FALSE (0)

Description:
Performs logical negation on an expression. The following table illustrates how result is determined:

If expression is The result is
True False
False True

Zep--

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MrTAToad
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Posted: 20th Sep 2002 19:39
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The negative of TRUE is FALSE...

NOT turns blue, so it must be a command, and its in the help file too...

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Zep
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Posted: 20th Sep 2002 19:50
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does this work?

a=1
b=2
c=(a not b)
print c
a=1
b=1
c=(a not b)
print c

Zep--

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MrTAToad
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Posted: 20th Sep 2002 19:54
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Yes, as does

a=1
PRINT NOT a

Seems it needs a variable to deal with

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Freddix
AGK Developer
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Location: France
Posted: 20th Sep 2002 22:11
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When I try your code I got a window error message :

_TEST casued a failure in module <inconnu> à 0000:0079969e.
Registers :
EAX=ffffffff CS=0187 EIP=0079969e EFLGS=00010206
EBX=00540000 SS=018f ESP=0064f714 EBP=0064f73c
ECX=0040f798 DS=018f ESI=00000000 FS=212f
EDX=0040f798 ES=018f EDI=00000000 GS=0000
Octets à CS : EIP :
00 00 00 00 a3 ac 00 52 00 a1 ac 00 52 00 50 bb
État de la pile :
00000000 00000000 0064f73c 0064f734 00540000 0040f798 0040f798 00799690 00403947 0040f798 0064f760 00403bba f139c601 004021d2 00000008 00402101
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Dreamora
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Posted: 21st Sep 2002 03:07
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NOT makes no sence with variables other than boolean cause NOT is normally used for bitoperations and modification of bitflags

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MrTAToad
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Posted: 22nd Sep 2002 17:58
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NOT should be able to be used with any type of variable (except for strings and floats), as it just performs a two's complement on the value.

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Khumba
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Posted: 22nd Sep 2002 19:09
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Hmm, this crashes also:
a = (not 1)
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MrTAToad
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Posted: 23rd Sep 2002 11:58
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At the moment, the NOT command seems that it can only handle variables..

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