# Numbers

## version 1 by Krister Fundin

**Part 2 - Testing**

Divisibility relates a number (called A) to a number (called B) when the remainder after dividing A by B is zero.

The verb to divide (he divides, they divide, he divided, it is divisible) implies the reversed divisibility relation.

To decide whether (N - an arithmetic value of kind K) is between (A - K) and (B - K):

if A is greater than B, decide on whether or not N is between B and A;

if N is less than A, no;

if N is greater than B, no;

yes.

To decide whether (N - an arithmetic value of kind K) is not between (A - K) and (B - K):

if A is greater than B, decide on whether or not N is not between B and A;

if N is less than A, yes;

if N is greater than B, yes;

no.