FT_BYTEAND()
 Perform bit-wise AND on two ASCII characters (bytes)
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 Syntax

      FT_BYTEAND( <cByte1>, <cByte2> ) -> cByte

 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 any bit-wise masking operation.  In effect, this is a
     bit-by-bit AND operation.  Equivalent to AND 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 would mask out the high nibble (four most significant bits)
     of the byte represented by chr(123) and leave the low nibble bits as in
     the parameter byte.

          cNewbyte := FT_BYTEAND( CHR(123), CHR(15) )
          ? asc(cNewByte)  // result: 11
          ? 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: BYTEAND.PRG

 Author: Forest Belt, Computer Diagnostic Services, Inc.