modulo arithmetic

(Or "clock arithmetic") A kind of integer

arithmetic that reduces all numbers to one of a fixed set

[0..N-1] (this would be "modulo N arithmetic") by effectively

repeatedly adding or subtracting N until the result is within

this range.

Ordinary "clock arithmetic" is like modulo arithmetic except

that the range is [1..12] whereas modulo 12 would be [0..11].

(1999-07-13)