Name:        NBITS

Purpose:     count the number of bits in a 32-bit word which are set

Author:      J.P. Terlouw

Use:         NBITS ( word )                [ INTEGER function]

               word  =  32-bit value

Warning:     A routine with the same name and a similar function exists 
             for the VAX. That routine currently takes a 16-bit argument.
             
Updates:     15-Sep-89  original document