JCL Help:CountBitsSet@Byte

 JCL Help: CountBitsSet Function

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Summary

Returns the number of set bits in the passed value.

Pascal

 function CountBitsSet(X: Byte): Integer; overload;
function CountBitsSet(X: Word): Integer; overload;
function CountBitsSet(X: Smallint): Integer; overload;
function CountBitsSet(X: ShortInt): Integer; overload;
function CountBitsSet(X: Integer): Integer; overload;
function CountBitsSet(X: Cardinal): Integer; overload;
function CountBitsSet(X: Int64): Integer; overload;
function CountBitsSet(P: Pointer; Count: Cardinal): Cardinal; overload;

Parameters

Parameters	Description
X: Byte	The value for which to determine the number of bits that are set.

Return Value

The number of set bits or 0 if no bits are set.

Description

CountBitsSet returns the number of bits that are set (value 1) in the binary representation of the supplied Value. For example, CountBitsSet(1) returns 1, CountBitsSet(3) returns 2 etc. Note that signed integers are stored in two's complement form and therefore, for example, CountBitsSet(-1) will return 32!

See Also

BitsLowest BitsHighest

About

Unit

JclLogic

Donator

Michael Schnell

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