Bash script problems int to binary


 
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# 8  
Old 11-23-2019
I think adding any negative numbers to 256 should get the desired result.

(I believe this should work OK in bash 3.2.x but dont have that version to confirm).

Code:
# decimal2binary.sh <integer_-127_to_127>
dec2bin () {
  # dec2bin num [width] [var]
  local num bin=""
  for((num=$1;num;num/=2))
  do
    bin=$((num%2))$bin
  done
  ((${#3})) &&
      printf -v ${3} "%0*d" ${2:-1} $bin ||
      printf "%0*d\n" ${2:-1} $bin
}

[ $1 -lt 0 ] &&
   dec2bin 256+$1 8 ||
   dec2bin $1 8

This User Gave Thanks to Chubler_XL For This Post:
# 9  
Old 11-23-2019
How about
Code:
$ BITS=16
$ VALUE=-127
$ for ((i=BITS; --i>=0;)); do printf "%d" $(( ${VALUE%%[0-9]*}(VALUE>>i)%2 )); done; printf "\n"
1111111110000001

This User Gave Thanks to RudiC For This Post:
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