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BitMaskClear
Last update:
May 18, 2026
Description
Performs a bitwise mask clear operation.
Returns
A number, bitwise cleared, with length bits beginning at start.
Category
Function syntax
BitMaskClear(number, start, length) |
See also
Parameters
Parameter | Description |
number | 32-bit signed integer |
start | Integer, in the range 0-31, inclusive; start bit for mask |
length | Integer, in the range 0-31, inclusive; length of mask |
Usage
Bit functions operate on 32-bit signed integers, in the range -2147483648 - 2147483647.
Example
<h3>BitMaskClear Example</h3>
<p>Returns number bitwise cleared with length bits beginning from start.</p>
<p>BitMaskClear(255, 4, 4): <cfoutput>#BitMaskClear(255, 4, 4)#</cfoutput></p>
<p>BitMaskClear(255, 0, 4): <cfoutput>#BitMaskClear(255, 0, 4)#</cfoutput></p>
<p>BitMaskClear(128, 0, 7): <cfoutput>#BitMaskClear(128, 0, 7)#</cfoutput></p>Example
<cfscript>
number = 255 ;
number1 = 0 ;
length =4 ;
writeOutput(bitmaskclear(number, number1, length)) ; //Return 240
</cfscript>
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