Computer Science Canada

what is a boolean

Author:	SNIPERDUDE [ Tue May 27, 2008 10:09 am ]
Post subject:	RE:what is a boolean
a boolean is a type of variable. an integer (int) holds a whole number a real number (real) hold a decimal number a boolean hold a true/false value. ex: var test : boolean := true

Author:	isaiahk9 [ Tue May 27, 2008 3:18 pm ]
Post subject:	RE:what is a boolean
Booleans are useful when you only deal with two possible outcomes. Example - var isp1right : boolean := true loop if player clicks left key, then isp1right := false, p1x -= 5 elsif player clicks right key, then isp1right := true, p1x += 5 end if Draw (character, p1x, p1y, PicMerge) end loop %I used this for my fighter game - so that the character would face right and left when you press right and left.

Author:

Hendo [ Tue May 27, 2008 7:37 pm ]

Post subject:

RE:what is a boolean

yeah they're very useful if you only want to execute something if the variable hold true (or not)

So something like

code:

if boolvar1 = true then
x=x+1
else
%if its not true
x=x-1 %do this instead
end if

Author:	Reality Check [ Tue May 27, 2008 8:20 pm ]
Post subject:	Re: what is a boolean
It's simply a variable with only two possible states. This is ideal for checking is a certain event has been reached and whatnot and is more ideal than using any other kind of variable because it'd use less memory.

Author:	Mackie [ Tue May 27, 2008 8:25 pm ]
Post subject:	RE:what is a boolean
Actually a boolean is 8 bits, same as nat1 (Range of 0 - 255). Surprising enough, I'd think it would only be 1 bit. On or off.

Author:	Tony [ Tue May 27, 2008 8:37 pm ]
Post subject:	RE:what is a boolean
a boolean, as a variable, is indeed 8 bits. If you want to use less memory though, you could use a nat1 as an array of 8 boolean values.

Author:	Mackie [ Tue May 27, 2008 8:51 pm ]
Post subject:	RE:what is a boolean
That is a very smart idea! I'll have to remember that.

You can syndicate this boards posts using the file backend.php or view the topic map using sitemap.php.

Terms of Use | Privacy Policy