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FT_BYTENOT()
Perform bit-wise NOT on an ASCII character (byte)
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Syntax
FT_BYTENOT( <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 bitwise byte manipulation. In effect, this is a
bit-by-bit NOT (one's complement) operation. Equivalent to the
NOT 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 bitwise NOT on byte represented by CHR(32):
cNewByte := FT_BYTENOT( CHR(32) )
? ASC( cNewByte ) // result: 223
For a demonstration of Clipper bit manipulations, compile and
link the program BITTEST.PRG in the Nanforum Toolkit source code.
Source: BYTENOT.PRG
Author: Forest Belt, Computer Diagnostic Services, Inc.
See Also:
FT_BYTEOR()
FT_BYTEXOR()
FT_BYTENEG()
FT_BYTEAND()
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