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Non-numbers that are passed will return -1, and print an error message.
This includes decimal places, as only integers can be even or odd.
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When no args are provided, even will now print the help message and
return -1.
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Before, quiet worked in reverse, i.e. text was only displayed when -q
was passed. Also, even now will not return 1 with an odd number when
quiet is not passed.
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Zig is actually handling the building and such, now the Makefile is
here just as a wrapper for it.
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Optimizing for size for the current comparison. Also, I don't know of a
generic way to do ${OBJ}: ${SRC} as a Makefile target, so I made that
part not generic.
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This makes it both faster and smaller.
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Changed around stuff in the help message to make it more consistent
with zeven.
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The help message was missing some information, that has now been added.
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even is a basic binary to check if the provided number is even.
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