Are You Odd?

Occasionally the needs arises to determine if a number is odd or even. Why would you need to do this? One example is the 'striping' of output, where information is presented in rows, and alternating rows have a different background color, like this:


You would think that languages would all have a function for this by now, but just as determining whether a year is a leap year is often still up to the programmer, so too is whether a number is odd or even.

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