Click above to get retro games delivered to your door ever month!
[<<Previous Entry] [^^Up^^] [Next Entry>>] [Menu] [About The Guide]
FT_BYTEXOR()
Perform bit-wise XOR on two ASCII characters (bytes)
------------------------------------------------------------------------------
Syntax
FT_BYTEXOR( <cByte1>, <cByte2> ) -> cNewByte
Arguments
<cByte1> and <cByte2> are characters from CHR(0) to CHR(255).
May be passed in CHR() form, as character literals, or
as expressions evaluating to CHR() values.
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 XOR operation. Equivalent to XOR 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 XOR on two bytes represented
by CHR(32) and CHR(55):
cNewByte := FT_BYTEXOR( CHR(32), CHR(55) )
? ASC( cNewByte ) // result: 23
? cNewByte // result: non-printable character
For a demonstration of Clipper bit manipulations, compile and
link the program BITTEST.PRG in the Nanforum Toolkit source code.
Source: BYTEXOR.PRG
Author: Forest Belt, Computer Diagnostic Services, Inc.