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X-Hacker.org- Nanforum Toolkit v2.1 Reference Guide - <b>ft_byteneg()</b>
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FT_BYTENEG()
Perform bit-wise negation on an ASCII character
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Syntax
FT_BYTENEG( <cByte> ) -> cNewByte
Arguments
<cByte> is a character from CHR(0) to CHR(255).
May be passed in CHR() form, as character literal, or
as expression evaluating to CHR() value.
Returns
Returns resulting byte, in CHR() form. If parameters are faulty,
returns NIL.
Description
Can be used for bit-wise byte manipulation. In effect, this is a
bit-by-bit NEG (two's complement) operation. Equivalent to NEG
assembler instruction.
This function is presented to illustrate that bit-wise operations
are possible with Clipper code. For greater speed, write .C or
.ASM versions and use the Clipper Extend system.
Examples
This code performs a bit-wise NEG on byte represented by CHR(32):
cNewByte := FT_BYTENOT(CHR(32))
? asc(cNewByte) // result: 224
For a demonstration of Clipper bit manipulations, compile and
link the program BITTEST.PRG in the Nanforum Toolkit source code.
Source: BYTENEG.PRG
Author: Forest Belt, Computer Diagnostic Services, Inc.
See Also: FT_BYTEOR() FT_BYTEXOR() FT_BYTENOT() FT_BYTEAND()
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