mirror of
https://dicksdeathabove.xyz/~mia/psh-fractional
synced 2024-09-19 16:40:44 +00:00
62 lines
1.5 KiB
Bash
Executable file
62 lines
1.5 KiB
Bash
Executable file
#!/bin/sh
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rad(){ # add decimal to $1 based on $2
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# literal reverse of what ad() from multiplication/mul does
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m="$1"; n=0; while [ "$m" ]; do
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next="${m#?}"
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[ "$n" -eq "$2" ] && break
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e="${e}${m%$next}"
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m="$next"; : $((n+=1))
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done
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w="${1#$e}"; echo "${3}${e}.${w:-0}"
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}
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fd() {
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m="$1"; n=1; while [ "$m" ]; do
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next="${m%?}"
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[ "$n" -eq "${#1}" ] && {
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echo "${m%next}"
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break
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}
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: $((n+=1)); m="$next"
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done
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}
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[ -z "${1##*.*}" -o -z "${2##*.*}" ] || { # if not floats
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echo "$(($1-$2))"
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exit 0
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}
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if [ ! -z "${1##*.*}" ]; then
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set -- "${1}.0" "$2"; d="${1#*.}"; d2="${2#*.}"
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until [ "${#d}" -eq "${#d2}" ]; do
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set -- "${1}0" "$2"
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d="${1#*.}"
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done
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elif [ ! -z "${2##*.*}" ]; then
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set -- "$1" "${2}.0"; d="${2#*.}"; d2="${1#*.}"
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until [ "${#d}" -eq "${#d2}" ]; do
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set -- "$1" "${2}0"
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d="${2#*.}"
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done
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fi # if $1/$2 is not a float; convert to float
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m1="${1%.*}"; m2="${2%.*}"; if [ "${#m2}" -gt "${#m1}" ]; then
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dn="${#m2}"
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elif [ "${#m2}" -eq "${#m1}" ]; then
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dn="${#m1}"
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else
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dn="${#m1}"; : $((dn+=1))
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fi
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## SWAP IF $1 > $2; negative handling
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m1="${1%.*}${1#*.}"; m2="${2%.*}${2#*.}"
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[ "$m1" -lt "$m2" ] && {
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set -- "$2" "$1"
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m1="${1%.*}${1#*.}"; m2="${2%.*}${2#*.}"; nr="-"
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}
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#echo "$m1 $m2 $dn"
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until [ "${m1#0}" = "$m1" ]; do
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m1="${m1#0}"
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done
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until [ "${m2#0}" = "$m2" ]; do
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m2="${m2#0}"
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done # dash has issues when numbers have leading 0's
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# zsh,bash,etc don't need this at all
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# and really dash shouldn't either but /shrug
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rad "$((m1-m2))" "$dn" "${nr}"
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