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- procedure:
**bit-string-zero?***bit-string* Returns

`#t`

if`bit-string`contains only 0 bits; otherwise returns`#f`

.

- procedure:
**bit-string=?***bit-string-1 bit-string-2* -
Compares the two bit string arguments and returns

`#t`

if they are the same length and contain the same bits; otherwise returns`#f`

.

- procedure:
**bit-string-not***bit-string* -
Returns a newly allocated bit string that is the bitwise-logical negation of

`bit-string`.

- procedure:
**bit-string-movec!***target-bit-string bit-string* The destructive version of

`bit-string-not`

. The arguments`target-bit-string`and`bit-string`must be bit strings of the same length. The bitwise-logical negation of`bit-string`is computed and the result placed in`target-bit-string`. The value of this procedure is unspecified.

- procedure:
**bit-string-and***bit-string-1 bit-string-2* Returns a newly allocated bit string that is the bitwise-logical “and” of the arguments. The arguments must be bit strings of identical length.

- procedure:
**bit-string-andc***bit-string-1 bit-string-2* Returns a newly allocated bit string that is the bitwise-logical “and” of

`bit-string-1`with the bitwise-logical negation of`bit-string-2`. The arguments must be bit strings of identical length.

- procedure:
**bit-string-or***bit-string-1 bit-string-2* Returns a newly allocated bit string that is the bitwise-logical “inclusive or” of the arguments. The arguments must be bit strings of identical length.

- procedure:
**bit-string-xor***bit-string-1 bit-string-2* Returns a newly allocated bit string that is the bitwise-logical “exclusive or” of the arguments. The arguments must be bit strings of identical length.

- procedure:
**bit-string-and!***target-bit-string bit-string* - procedure:
**bit-string-or!***target-bit-string bit-string* - procedure:
**bit-string-xor!***target-bit-string bit-string* - procedure:
**bit-string-andc!***target-bit-string bit-string* These are destructive versions of the above operations. The arguments

`target-bit-string`and`bit-string`must be bit strings of the same length. Each of these procedures performs the corresponding bitwise-logical operation on its arguments, places the result into`target-bit-string`, and returns an unspecified result.