# NOT (Operator)

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The `NOT`

operator returns the 1's complement of its operand, after it has been rounded down if it is not an integer. The 1's complement of a value can be considered `-1-value`

. Some examples are:

`NOT 0`

is `-1`

`NOT -1`

is `0`

`NOT 5`

is `-6`

`NOT 5.7`

is `-6`

`NOT -6`

is `5`

`NOT -6.2`

is `6`

Note that e.g. `NOT5`

is a variable name; to use the `NOT`

operator without it becoming a variable name, it must be followed by a space, one of the other unary operators, or parentheses.

It is important not to confuse this (integer-only) bitwise NOT with `!`

, the logical NOT operator. `NOT FALSE`

(`NOT 0`

) has the logical sense of TRUE (though it is not the same value as `TRUE`

, `1`

), `NOT TRUE`

also has the logical sense of TRUE, because the bitwise `NOT 1`

is -2, and any nonzero numerical value interpreted as a logic value is considered to be TRUE. (Most programming languages, when they have to have a correspondence between numerical values and logical values, use 0 for FALSE and -1 for TRUE, precisely so that the bitwise NOT on the boolean values is the same as the logical NOT. SmileBoom decided to go a different way.)

This operator is in the unary precedence group, which is the highest. This means all unary operators are evaluated before any others, e.g. the bitwise operators, so `NOT A AND B`

is evaluated as `(NOT A) AND B`

. Since all unary operators are prefixes to their operands, they are right-associative, i.e. the rightmost ones are evaluated first.