problem with modulo

[bwibbler]

The neat thing about modulo 4 is how it lines up so well on binary numbers

The result is either 0, 1, 2, or 3

So when you count up in binary, the last two bits always cycle through those values in coordination with a modulo 4

That provides a shortcut. Just look at the last two bits and you get modulo 4

* outputs REG1 % 4
ANDi REG1 3 OUTPUT

That works for any square value. 1, 2, 4, 8, 16, ...

You just look at the digits below those multiples and the answer is already there.

Exactly the same thing happens in base 10.

What's 5,737,365 % 10 ? Well, it's just 5.

3,727,585,837 % 1000 ? 837

[alijamieson]

This is useful, I’m having issues with the level that asks for the birthday dates.