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Jimbo1991

Tue May 27, 2008 10:05 am


what is a boolean

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what exactly is a boolean?


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SNIPERDUDE

Tue May 27, 2008 10:09 am


RE:what is a boolean

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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


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isaiahk9

Tue May 27, 2008 3:18 pm


RE:what is a boolean

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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.


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Hendo

Tue May 27, 2008 7:37 pm


RE:what is a boolean

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

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



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Reality Check

Tue May 27, 2008 8:20 pm


Re: what is a boolean

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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.


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Mackie

Tue May 27, 2008 8:25 pm


RE:what is a boolean

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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.


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Tony

Tue May 27, 2008 8:37 pm


RE:what is a boolean

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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.


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Mackie

Tue May 27, 2008 8:51 pm


RE:what is a boolean

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That is a very smart idea! I'll have to remember that.