The ^ operator performs a bitwise XOR
<https://en.wikipedia.org/wiki/Bitwise_operation#XOR>. This is not the same as
> On Sep 18, 2016, at 05:41, Mr Bee via swift-users <firstname.lastname@example.org>
> Hi all,
> I wrote this in XCode Playground…
> let i = 2^2
> It runs fine without any errors and print 0, while I expect it to print 4
> from 2 power by 2 or 2². Swift ebook and even Google gave me nothing on this.
> What did I miss?
> Thank you.
> –Mr Bee
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