Negative decimal to binary


 
Thread Tools Search this Thread
Top Forums UNIX for Beginners Questions & Answers Negative decimal to binary
# 8  
Old 11-24-2019
Quote:
Originally Posted by Neo
Please check this (above) for accuracy... thanks.
Code:
[nez@rox unix]$ D2B=($(eval echo $(printf %.s\{0,1} {0..15})))
[nez@rox unix]$ echo ${D2B[127]}
0000000001111111
[nez@rox unix]$ echo ${D2B[-127]}
1111111110000001
[nez@rox unix]$ echo ${D2B[1]}
0000000000000001 
[nez@rox unix]$ echo ${D2B[-1]}
1111111111111111
[nez@rox unix]$ echo ${D2B[32767]}
0111111111111111
[nez@rox unix]$ echo ${D2B[-32767]}
1000000000000001
[nez@rox unix]$ bash --version
GNU bash, версия 5.0.7(1)-release (x86_64-redhat-linux-gnu)

invert and add one, everything is correct.
possibly this?
Code:
D2B=($(eval echo $(printf %.s'{0,1}' {0..15})))

# 9  
Old 11-24-2019
Quote:
Originally Posted by wisecracker
Nice and I thanked the post but...
Be aware, this only works in ksh93 and zsh on Apple gear.
'bash 3.2.x which is all we have with Apple, and POSIX' is a non-starter.
You should still be able to do:
Code:
$ D2B=({0,1}{0,1}{0,1}{0,1}{0,1}{0,1}{0,1}{0,1})
$ echo ${D2B[256-127]}

or
Code:
$ echo ${D2B[${#D2B[*]}-127]}

This User Gave Thanks to Chubler_XL For This Post:
# 10  
Old 11-24-2019
Hi Chubler_XL...

I have never seen that before, thanks a lot.
Just shows how much I don't know. Once seen never forgotten...
(But sadly, it won't work in dash.)
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Programming

Urgent help needed.. C++ program to convert decimal to hexa decimal

Hi , seq can be 0...128 int windex = seq / 8; int bindex = seq % 8; unsigned char bitvalue = '\x01' << (7-bindex) ; bpv.bitmapvalue = bitvalue; This is the part of a program to convert decimal to bitmap value of hexadecimal. I want this to change to convert only to... (1 Reply)
Discussion started by: greenworld123
1 Replies

2. Programming

Binary to decimal for particular bits

Hello, I have script which work fine on particular data.file . The next feature I want to achieve is to get the decimal equivalent of data to data. The data looks like this : data(01000000000000000000110000000000) thank you.. #include <iostream> #include <fstream> #include... (4 Replies)
Discussion started by: emily
4 Replies

3. Shell Programming and Scripting

How to get the negate of decimal to binary?

Hi All, New to this forum (and yes , a newbie in programming..:p) I have a decimal to binary converter script done this way : i=$1 bit0=$(( (i & 0x01) > 0 )) bit1=$(( (i & 0x02) > 0 )) bit2=$(( (i & 0x04) > 0 )) bit3=$(( (i & 0x08) > 0 )) bit4=$((... (6 Replies)
Discussion started by: digiteltlc
6 Replies

4. Shell Programming and Scripting

Converting string to negative decimal value

I need code for converting a string to a negative decimal value. For ex, i have the value in the form of a string (5489.95-) i need to convert it into decimal value (-5489.95) while getting output using printf command. i know how to get as a string a="5489.95-" printf "%10s"$a >>xyz.dat ... (5 Replies)
Discussion started by: angie1234
5 Replies

5. Shell Programming and Scripting

error- multiplying negative decimal values

a=10.02 pattern=-11.01 b=$(echo | awk '{ print $a*$pattern}') echo $b its not working even ALso tried `expr $a \* $pattern` No LUCK (3 Replies)
Discussion started by: saluja.deepak
3 Replies

6. Homework & Coursework Questions

Decimal to BCD (Binary Coded Decimal)

Use and complete the template provided. The entire template must be completed. If you don't, your post may be deleted! 1. The problem statement, all variables and given/known data: Design an algorithm that accepts an input a decimal number and converts it into BCD (Binary... (2 Replies)
Discussion started by: caramba
2 Replies

7. UNIX for Dummies Questions & Answers

Decimal to BCD (Binary Coded Decimal)

Anybody please help me... Design an algorithm that accepts an input a decimal number and converts it into BCD (Binary Coded Decimal) representation. Also, draw its Flow Chart. This is a unix qn... plz post algorithm for that :confused: (1 Reply)
Discussion started by: caramba
1 Replies

8. UNIX for Advanced & Expert Users

Converting Binary decimal coded values to Ascii Values

Hi All, Is there any command which can convert binary decimal coded values to ascii values... i have bcd values like below 0-- -v - Pls suggest a way to convert this. Thanks, Deepti.Gaur (3 Replies)
Discussion started by: gaur.deepti
3 Replies

9. Programming

decimal to binary function error

I have the following simple code to return a binary number in a array format given an interger and the number of the bits for specifying the interger as binary number. #include <stdio.h> #include <stdlib.h> int main () { // int* get_binary_number(int* bit_array, int num, int... (8 Replies)
Discussion started by: return_user
8 Replies

10. Shell Programming and Scripting

unix script for converting a decimal to binary

Could anybody please help me in writing a script in unix for converting a decimal number to binary number. (3 Replies)
Discussion started by: softy
3 Replies
Login or Register to Ask a Question