Core Function BitNOT

Revision as of 00:07, 28 November 2011

BitNOT( <expression> )

Description

Performs a bitwise NOT operation.

Parameters

expression

The first number.

expression2

The second number.

n

Optional; The nth number - up to 255 values can be specified.

Return Value

Returns the bitwise NOT of the value.

Bit operations are performed as 32-bit integers.

Remarks

Remember hex notation can be used for numbers.

Remember that in 2's-complement notation, BitNOT is functionally equivalent to adding 1 and negating the result.

Also remember that NOT changes a 0 bit to 1 and vice-versa.

Some might wonder the point of such a function when clear ~ operators exist but why not!.

Example

$x = BitNot(5);
println($x);
 
/*
    Result is -6 because for 32-bit numbers
    5 == 00000000000000000000000000000101 binary
    -6 == 11111111111111111111111111111010 binary
    and the first bit is signed
*/
 
// Another method
$x = ~5;
println($x);