Number questions

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Bindie
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Number questions

Post by Bindie » Fri May 08, 2015 7:31 pm

Hey, been wondering this for some time. How do I compare a number too see if it's decimal or an integer?

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ivan
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Re: Number questions

Post by ivan » Fri May 08, 2015 7:56 pm

Code: Select all

if math.floor(number) == number then
  -- is integer
else
  -- non-integer
end
There may be some robustness issues of course but it should work as
long as the number is not very large or small.

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T-Bone
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Re: Number questions

Post by T-Bone » Fri May 08, 2015 9:15 pm

If that's what you want to do, ivan's solution should work just fine. It sounds to me however like something you would never need to do. If you need an integer, but aren't sure it is one, just use math.floor(datNumber) (or math.floor(datNumber + 0.5) if you want to round it).

davisdude
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Re: Number questions

Post by davisdude » Fri May 08, 2015 10:23 pm

You could also check if a number is an integer by doing this:

Code: Select all

function isInteger( x )
     return x % 1 == 0
end
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Bindie
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Re: Number questions

Post by Bindie » Sat May 09, 2015 5:50 pm

Both solutions work for me. :) Basically I was trying to make this kind of grid:

Code: Select all

{
{w,w,w,w,w,w,w,w,w}
{w,0,0,0,0,0,0,0,w}
{w,0,i,0,i,0,i,0,w}
{w,0,0,0,0,0,0,0,w}
{w,0,i,0,i,0,i,0,w}
{w,0,0,0,0,0,0,0,w}
{w,0,i,0,i,0,i,0,w}
{w,0,0,0,0,0,0,0,w}
{w,w,w,w,w,w,w,w,w}
}                           -- i = indestructable
                            -- w = wall
                            -- 0 = floor
+1 point for anyone who guesses right what kind of clone I'm making?

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zorg
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Re: Number questions

Post by zorg » Sun May 10, 2015 2:01 pm

Bindie wrote:+1 point for anyone who guesses right what kind of clone I'm making?
Just a shot in the dark
Me and my stuff :3True Neutral Aspirant. Why, yes, i do indeed enjoy sarcastically correcting others when they make the most blatant of spelling mistakes. No bullying or trolling the innocent tho.

Bindie
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Re: Number questions

Post by Bindie » Sun May 10, 2015 2:20 pm

Bull's eye, +1!

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T-Bone
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Re: Number questions

Post by T-Bone » Sun May 10, 2015 3:35 pm

Why would you need to know if a number is an integer or not to produce such a grid?

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s-ol
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Re: Number questions

Post by s-ol » Sun May 10, 2015 3:52 pm

T-Bone wrote:Why would you need to know if a number is an integer or not to produce such a grid?
My best guess is he halfed the x coordinate and checked whether it was integer?

In that case he should've just take the modulo-2:

Code: Select all

if x%2 == 0 then -- x is even end

s-ol.nu /blog  -  p.s-ol.be /st8.lua  -  g.s-ol.be /gtglg /curcur

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print( type(love) )
if false then
  baby:hurt(me)
end

Bindie
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Re: Number questions

Post by Bindie » Sun May 10, 2015 6:58 pm

S0lll0s wrote:My best guess is he halfed the x coordinate and checked whether it was integer?

In that case he should've just take the modulo-2:

Code: Select all

if x%2 == 0 then -- x is even end
That's right, I found an easier solution though using false and true values.

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