The

opposite of

even.

All

integers are either even or odd, with

numbers evenly distributed (and

alternating) across both

sets. A

test to see if an integer is

even or odd is whether or not said number is

cleanly divisible by two (if so, the number is even, otherwise it is odd). In an

exponent-based number system, this test can be

reduced to looking at the last

digit, and determining whether it is cleanly

divisible by two, with the same test applied.

A common

programming construct is to perform a

bitwise AND with a number and a single 1 bit, the

boolean result of which will tell whether the number in question is odd:

`BOOL is_odd = test & 1;`