numeric - display positive decimal numbers as binary, octal & hexadecimal & their binary length

#!/bin/sh
# numeric v1.6 - display positive decimal numbers as binary, octal & hexadecimal & their binary length.
# You can use other numeric systems by entering numbers with the corresponding arithmetic expression,
# i.e. $((0n)) for octal or $((0xn)) for hexadecimal.

IN=$((${1##*[!0-9]*}+0)) # anything else but a decimal number is turned into 0
DEC=0
EXP=1
while [ $IN -gt 0 ]; do # convert decimal to binary
    BIN=$((IN&1))$BIN
    : $((IN >>= 1))
done
[ ${#BIN} -lt 5 ] && LEN=5.${#BIN} || LEN=${#BIN}
printf "%s %${LEN%.*}s\n" "BIN:" ${BIN:-0}
while [ ${#BIN} -gt 0 ]; do # convert binary back to decimal
    DEC=$(($DEC+${BIN#${BIN%?}}*$EXP))
    EXP=$(($EXP*2))
    BIN=${BIN%?}
done
printf "%s %${LEN%.*}s\n" "OCT:" $(printf "%o" $DEC) "DEC:" $DEC "HEX:" $(printf "%x" $DEC) "LEN:" ${LEN#*.}" bit"