BIT(3F)                                                                BIT(3F)



NAME
       bit - and, or, xor, not, rshift, lshift bitwise functions

SYNOPSIS
       (intrinsic) function and (word1, word2)

       (intrinsic) function or (word1, word2)

       (intrinsic) function xor (word1, word2)

       (intrinsic) function not (word)

       (intrinsic) function rshift (word, nbits)

       (intrinsic) function lshift (word, nbits)

DESCRIPTION
       These bitwise functions are built into the compiler and return the data
       type of their argument(s).  Their arguments must be integer or  logical
       values.

       The  bitwise  combinatorial functions return the bitwise ‘‘and’’ (and),
       ‘‘or’’ (or), or ‘‘exclusive or’’ (xor) of two  operands.   Not  returns
       the bitwise complement of its operand.

       _L_s_h_i_f_t,  or  _r_s_h_i_f_t with a negative _n_b_i_t_s, is a logical left shift with
       no end around carry.  _R_s_h_i_f_t, or _l_s_h_i_f_t with a negative  _n_b_i_t_s,  is  an
       arithmetic right shift with sign extension.  No test is made for a rea‐
       sonable value of _n_b_i_t_s_.

       These functions may be used to create a variety of general routines, as
       in the following statement function definitions:

       integer bitset, bitclr, getbit, word, bitnum

       bitset( word, bitnum ) = or(word,lshift(1,bitnum))
       bitclr( word, bitnum ) = and(word,not(lshift(1,bitnum)))
       getbit( word, bitnum ) = and(rshift(word,bitnum),1)

FILES
       These functions are generated in-line by the f77 compiler.



4.2 Berkeley Distribution       April 30, 1986                         BIT(3F)