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Full Discussion: Negative decimal to binary
Top Forums UNIX for Beginners Questions & Answers Negative decimal to binary Post 303041435 by wisecracker on Saturday 23rd of November 2019 06:01:23 PM
Old 11-23-2019
You could use XOR but here is a solution that is fully POSIX complaint:
Code:
#!/usr/local/bin/dash
# decimal2binary.sh <integer_-128_to_127>
#
# USAGE: [/full/path/to/][./]decimal2binary.sh <integer_from_-128_to 127>

NUMBER=${1}
STRING=""
PREFIX=0

# Account for -127 to -1.
if [ ${NUMBER} -ge -127 ] && [ ${NUMBER} -le -1 ]
then
    NUMBER=$(( NUMBER + 256 ))
    PREFIX=1
fi

# Account for -128.
if [ ${NUMBER} -eq -128 ]
then
    STRING=10000000
    echo "${STRING}"
    exit
fi

# Now do calculations for positive values only.
for COUNT in 6 5 4 3 2 1 0
do
    M=$(( NUMBER / 2 ))
    N=$(( NUMBER % 2 ))
    NUMBER=${M}
    STRING=$( printf "%d" "${N}" )${STRING}
done

# Print it, no need to reverse the string...
echo "${PREFIX}${STRING}"

Results, OSX 10.14.6, default bash terminal calling dash, POSIX compliant.
Code:
Last login: Sat Nov 23 22:28:58 on ttys000
AMIGA:amiga~> cd Desktop/Code/Shell
AMIGA:amiga~/Desktop/Code/Shell> ./decimal2binary.sh 0
00000000
AMIGA:amiga~/Desktop/Code/Shell> ./decimal2binary.sh -128
10000000
AMIGA:amiga~/Desktop/Code/Shell> ./decimal2binary.sh -127
10000001
AMIGA:amiga~/Desktop/Code/Shell> ./decimal2binary.sh -1
11111111
AMIGA:amiga~/Desktop/Code/Shell> ./decimal2binary.sh 1
00000001
AMIGA:amiga~/Desktop/Code/Shell> ./decimal2binary.sh 126
01111110
AMIGA:amiga~/Desktop/Code/Shell> ./decimal2binary.sh 127
01111111
AMIGA:amiga~/Desktop/Code/Shell> _

 

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LEARN ABOUT OPENDARWIN

nl

NL(1)                                                              User Commands                                                             NL(1)

NAME

       nl - number lines of files

SYNOPSIS

       nl [OPTION]... [FILE]...

DESCRIPTION

       Write each FILE to standard output, with line numbers added.

       With no FILE, or when FILE is -, read standard input.

       Mandatory arguments to long options are mandatory for short options too.

       -b, --body-numbering=STYLE
              use STYLE for numbering body lines

       -d, --section-delimiter=CC
              use CC for logical page delimiters

       -f, --footer-numbering=STYLE
              use STYLE for numbering footer lines

       -h, --header-numbering=STYLE
              use STYLE for numbering header lines

       -i, --line-increment=NUMBER
              line number increment at each line

       -l, --join-blank-lines=NUMBER
              group of NUMBER empty lines counted as one

       -n, --number-format=FORMAT
              insert line numbers according to FORMAT

       -p, --no-renumber
              do not reset line numbers for each section

       -s, --number-separator=STRING
              add STRING after (possible) line number

       -v, --starting-line-number=NUMBER
              first line number for each section

       -w, --number-width=NUMBER
              use NUMBER columns for line numbers

       --help display this help and exit

       --version
              output version information and exit

       By  default,  selects -v1 -i1 -l1 -sTAB -w6 -nrn -hn -bt -fn.  CC are two delimiter characters used to construct logical page delimiters, a
       missing second character implies :.  Type \ for .  STYLE is one of:

       a      number all lines

       t      number only nonempty lines

       n      number no lines

       pBRE   number only lines that contain a match for the basic regular expression, BRE

       FORMAT is one of:

       ln     left justified, no leading zeros

       rn     right justified, no leading zeros

       rz     right justified, leading zeros

AUTHOR

       Written by Scott Bartram and David MacKenzie.

REPORTING BUGS

       GNU coreutils online help: <http://www.gnu.org/software/coreutils/>
       Report nl translation bugs to <http://translationproject.org/team/>

COPYRIGHT

       Copyright (C) 2017 Free Software Foundation, Inc.  License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
       This is free software: you are free to change and redistribute it.  There is NO WARRANTY, to the extent permitted by law.

SEE ALSO

       Full documentation at: <http://www.gnu.org/software/coreutils/nl>
       or available locally via: info '(coreutils) nl invocation'

GNU coreutils 8.28                                                 January 2018                                                              NL(1)
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