Serious bug with types - GameCreators Forum

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Ratty Rat

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Joined: 24th Sep 2002

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Posted: 13th Dec 2002 18:48

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In the following bit of code you should see the message 'its zero!' printed, but its not.

Does this happen with anyone else?

+ Code Snippet

type test
   bool as boolean
endtype

dim a(0) as test

a(0).bool = 0

do
   print str$(bool)
   if a(0).bool = 0 then Print "its zero!"
loop

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Kale

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Location: United Kingdom

Posted: 13th Dec 2002 19:25

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i think i ran into this in javascript! i think it is because you are trying to evaluate a boolean value against an integer?

demonstrated here:

+ Code Snippet

type test
   bool as boolean
endtype

type compare
   bool as boolean
endtype

dim a(0) as test
dim b(0) as test

dim compare(0) as test

a(0).bool = 1
b(0).bool = 0

compare(0).bool = 1

print "a(0)"
print str$(a(0).bool)
if a(0).bool = compare(0).bool
   Print "its true!"
else
   Print "its false!"
endif
print ""
print "b(0)"
print str$(b(0).bool)
if b(0).bool = compare(0).bool
   Print "its true!"
else
   Print "its false!"
endif
input ""

What the flame does not consume, consumes the flame.
------------------------------------------------------------------------
AMD XP2100+, Geforce4Ti 4400, 512Mb DDR, Abit KX7, WinXP Home

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ZomBfied

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Posted: 13th Dec 2002 19:29

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Try saying

+ Code Snippet

type bool
b as boolean
endtype

global b1 as bool
global true = (1=1)
global false = (1=0)

b1.b = true

if b1.b = true then print "It's True!"

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MrTAToad

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Posted: 13th Dec 2002 19:38

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I think Lee should know about this...

Good news everybody! I really am THAT good...

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Rubberduck

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Joined: 13th Dec 2002

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Posted: 13th Dec 2002 22:48

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Hi.
Boolean Types are not buggy.

+ Code Snippet

type test
   bool as boolean
endtype

dim a(0) as test

a(0).bool = 0

do
   print str$(bool)
   if a(0).bool then Print "its zero!"
loop

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Kale

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Joined: 8th Sep 2002

Location: United Kingdom

Posted: 14th Dec 2002 00:54

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what you are testing there Rubberduck is if a(0).bool exsists! even this prints "its zero!"

+ Code Snippet

type test
   bool as boolean
endtype

dim a(0) as test

a(0).bool = 1


   print str$(bool)
   if a(0).bool then Print "its zero!"
input ""

to compare 'a(0).bool' correctly you need to compare it to another boolean value, NOT an integer or wether it exsists or not!

it would be great if this worked with boolean types

+ Code Snippet

if a(0).bool = 0 then Print "its zero!"

What the flame does not consume, consumes the flame.
------------------------------------------------------------------------
AMD XP2100+, Geforce4Ti 4400, 512Mb DDR, Abit KX7, WinXP Home

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Kale

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Location: United Kingdom

Posted: 14th Dec 2002 00:58

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infact i don't think its a bug, it just should be clearer what to test boolean values with! i know in some languages there are constants with which to test it with, kinda like this:

+ Code Snippet

if a(0).bool = #DB_BOOL_FALSE then Print "its false!"
if a(0).bool = #DB_BOOL_TRUE then Print "its true!"

this make more sense to me.

What the flame does not consume, consumes the flame.
------------------------------------------------------------------------
AMD XP2100+, Geforce4Ti 4400, 512Mb DDR, Abit KX7, WinXP Home

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empty

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Posted: 14th Dec 2002 01:55

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Hmm, this problem occurs with arrays only (not with variables).
So I guess it's a bug.

dim a(0) as Boolean
b as Boolean
a(0) = 0
b = 0
if a(0) = 0 then print "a(0) = 0"
if b = 0 then print "b = 0"
wait key

Ogres have layers.

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Kale

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Posted: 14th Dec 2002 02:32

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aha! i didn't notice that! yeah it looks like a bug then

What the flame does not consume, consumes the flame.
------------------------------------------------------------------------
AMD XP2100+, Geforce4Ti 4400, 512Mb DDR, Abit KX7, WinXP Home

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Ratty Rat

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Posted: 16th Dec 2002 16:08

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OK, thanks everyone, I should have spotted that, although I think there is a bit of a gap here as we don`t have the built in constants 'True' and 'False' as many other languages do and theres no way of assigning them as putting '#constant true 1' makes an integer not a boolean value.

Incidentally has anyone else noticed that you can put anything after '#constant whatever ' and it gets replaced in the code? for instance '#constant poo fecal matter' will replace 'poo' with 'fecal matter' anywhere in the code.

If you use a command over and over again you could use an abbreviation IE '#constant po position object'

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DarkBASIC Professional Discussion / Serious bug with types