Again, the work's already been done and is available in SNIPPETS. In this
case, simply include the header BITOPS.H, then use the defined macros. For
example...

        int intPack;
        unsigned long ulPack;

        BitSet(intPack, 3);             /* Set bit #3 in an int         */
        BitClr(ulPack, 21);             /* Clear bit #21 in a long      */

...etc. There are also macros to test or toggle specific bits. If you need
a number of bits that won't fit in an integral type (int, short, char, or
long - signed or unsigned), then you can use a char array with other macros
in BITOPS.H, or you can create bit arrays of any arbitrary length using the
functions in BITARRAY.C. 


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