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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 SUSE

cpanplus::shell

CPANPLUS::Shell(3pm)					 Perl Programmers Reference Guide				      CPANPLUS::Shell(3pm)

NAME

       CPANPLUS::Shell

SYNOPSIS

	   use CPANPLUS::Shell; 	    # load the shell indicated by your
					    # config -- defaults to
					    # CPANPLUS::Shell::Default

	   use CPANPLUS::Shell qw[Classic]  # load CPANPLUS::Shell::Classic;

	   my $ui      = CPANPLUS::Shell->new();
	   my $name    = $ui->which;	    # Find out what shell you loaded

	   $ui->shell;			    # run the ui shell

DESCRIPTION

       This module is the generic loading (and base class) for all "CPANPLUS" shells. Through this module you can load any installed "CPANPLUS"
       shell.

       Just about all the functionality is provided by the shell that you have loaded, and not by this class (which merely functions as a generic
       loading class), so please consult the documentation of your shell of choice.

BUG REPORTS

       Please report bugs or other issues to <bug-cpanplus@rt.cpan.org<gt>.

AUTHOR

       This module by Jos Boumans <kane@cpan.org>.

COPYRIGHT

       The CPAN++ interface (of which this module is a part of) is copyright (c) 2001 - 2007, Jos Boumans <kane@cpan.org>. All rights reserved.

       This library is free software; you may redistribute and/or modify it under the same terms as Perl itself.

SEE ALSO

       CPANPLUS::Shell::Default, CPANPLUS::Shell::Classic, cpanp

perl v5.12.1							    2010-04-26						      CPANPLUS::Shell(3pm)
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