Number questions

[Bindie]

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

[ivan]

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.

[T-Bone]

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]

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

Code: Select all

function isInteger( x )
     return x % 1 == 0
end

[Bindie]

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?

[zorg]

+1 point for anyone who guesses right what kind of clone I'm making?

Just a shot in the dark

[Bindie]

Bull's eye, +1!

[T-Bone]

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

[s-ol]

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

[Bindie]

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.