EVEN NUMBERS

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Permalink Reply by taz on March 20, 2010 at 12:41pm

Try this expression: x % 2 = 0

The "%" is "modulus" (there's also a modulus component...) which returns any remainder when x is divided by 2.

You'll have to watch out for zero which is neither even or odd, but with the above expression it comes out as an even number.

Permalink Reply by Maurice Martel on March 20, 2010 at 2:12pm

Thanks a lot TAZ

Permalink Reply by Arthur Mamou-Mani on August 4, 2011 at 8:59am

Thanks Taz, very helpful !

Permalink Reply by Dedackelzucht on August 5, 2011 at 1:22am

added to my favourite expressions!

 

Thank you!

 

DeDackel

Permalink Reply by BC on December 9, 2015 at 2:39pm

Hi all,

I want to dig up this thread as I've got a question to expand on it. In the situation that Taz demonstrated below, you can get a True/False result for whether or not a number is even. I've been able to get this to work. Now I want to add +1 to all the odd (false) options. I'm having difficulty separating the data so that it is only adding to the odd numbers, then recombining the data to be in the same order, however with the relevant +1 so that all numbers are even values in the final list/tree?

Ive got a good handle of GH, but never had much use for If/Then statements - might this be a good time to figure them out? Something along the lines of "If number is odd, add 1. If number is even, add 0." (?)

Thanks,

-BC

Permalink Reply by BC on December 9, 2015 at 2:53pm

Seems like I figured it out - I didn't realize there was actually a "modulus" component itself. Divide by 2, if there is a remainder, add it to the value! Comes out even every time.