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$bitoff identifier - mIRC
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$bitoff returns N with the Bth bit set to 0.

Synopsis[edit]

$bitoff(<N>,<B>)

Parameters[edit]

  • N - the number, in base10/decimal
  • B - The Bth bit to turn off

Properties[edit]

None

Example[edit]

//var %n 10 | echo -a $bitoff(%n,2)
; returns 8

Here's how the answer was calculated:

  1. Convert base-10 N to binary.
  2. Count 2 from the right
  3. That bit is set to 0
  4. Return the possibly altered number
//var %n 10 | echo -a $base(%n,10,2,32) | echo -a $str(-,24) $+ 87654321 | echo -a $base($bitoff(%n,2),10,2,32) $base(1000,2,10)
; returns:
00000000000000000000000000001010
------------------------87654321
00000000000000000000000000001000 8

If N is 2^32 or greater, returns 2^32 -1
If N is less than -2^31+1, returns 2^(B-1) +1

Using $biton and $bitoff, you can store several variables as bits within a single variable, instead of creating a separate variable for each.
The /window switch -wN uses bit settings, with default 3 if N not used. 

var %treebarsetting $true
var %switchbarsetting $true
var %n
if (%switchbarsetting) var %n $biton(%n,1)
if (%treebarsetting) var %n $biton(%n,2)
if (%n == $null) var %n 3

Compatibility[edit]

Added: mIRC v5.61
Added on: 23 Sep 1999
Note: Unless otherwise stated, this was the date of original functionality.
Further enhancements may have been made in later versions.


See also[edit]

[Expand]
v · d · e mIRC identifier list
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