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 resetbit()          Clear selected bit
------------------------------------------------------------------------------
 Declaration
   bit.hdr

 Syntax
   proc resetbit extern
   param       untyped xNumber, ;
         value uint    uBit

 Arguments
   xNumber is the value to operate on.
   uBit specifies the bit to clear.

 Return
   None.

 Description
   resetbit() clears a bit in the specified value xNumber. The lowest bit is
   addressed with uBit set to 0. The highest bit address depends on the
   type of xNumber.

 Example
   #define EXAMPLE_MATH
   #include example.hdr

   proc Test_resetbit
   vardef
      uint uValue
   enddef
   // reset the blink bit in an attribute value
   __syscolor[ CLR_STD ] := 0xff
   ? __syscolor[ CLR_STD ]
   resetbit( __syscolor[ CLR_STD ], 7 )
   ? __syscolor[ CLR_STD ]
   
   // make a number even
   uValue := 7
   ? uValue
   resetbit( uValue, 0 )
   ? uValue
   endproc

   proc main
   Test_resetbit()
   endproc