[Tutor] x%2
Steven D'Aprano
steve at pearwood.info
Tue Jan 10 03:23:02 CET 2012
emin wrote:
> http://www.youtube.com/watch?src_vid=QaYAOR4Jq2E&feature=iv&annotation_id=annotation_149056&v=M3g1GEkmyrw
> in this tutorial what does mean x%2 ?
x % 2 gives the remainder when you divide x by 2.
> i think: i * 2% = always even number
What does that mean? i*2% does not work in Python. In Python, % does not mean
percentage and so you can't multiply by 2%.
I guess you mean
i % 2 == 0 means i is an even number
and this would be correct. If i % 2 == 0 then i is even. If it equals 1 then i
is odd.
> but why not 4,6 or 8? but i * 4(6,8,10,12...)% = always even number too
The remainder i % n will be a number between 0 and n-1. i%2 is useful because
there are only two possible results, 0 (i is even) or 1 (i is odd).
i%4 is less useful, because there are four possibilities:
0 (i is even)
1 (i is odd)
2 (i is even)
3 (i is odd)
i%10 is less useful still, because there are ten possibilities:
0,2,4,6,8: i is even
1,3,5,7,9: i is odd
> for example: 100 * 2(4,6,8,10,12...)% = 2(4,6,8,10,12...)
> even numbers = {2,4,6,8,10,12...}
I don't understand what you are trying to say here.
> and how pyton understanding 0(even or odd number or it is an exception?)?
0 is always an even number, because it has 0 remainder when you divide by 2.
--
Steven
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