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#!/bin/bash
# bc -q <<<"obase=$1;$2"
set -eu
if [[ $# -eq 0 ]] || [[ $# -gt 2 ]]
then
cat >&2 <<-HERE
usage: $0 radix decimal
HERE
exit
fi
declare -i radix=$1
declare -i decimal=$2
[[ radix -gt 0 ]] || exit 1
if [[ $decimal -lt 0 ]]
then
printf -- -
decimal=-$decimal
fi
if [[ $radix -eq 12 ]]
then digits=({0..9} ↊ ↋)
else digits=({0..9} {a..z})
fi
number=''
while [[ $decimal -gt 0 ]]
do
digit=$((decimal%radix))
number=${digits[$digit]}$number
# decimal=$((decimal-(digit*radix)))
decimal=$((decimal/radix))
done
echo "$number"
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