chickadee » srfi-60 » bitwise-not

lognot nprocedure
bitwise-not nprocedure

Returns the integer which is the one's-complement of the integer argument.

Example:

(number->string (lognot #b10000000) 2)
    ; => "-10000001"
(number->string (lognot #b0) 2)
    ; => "-1"