mirror of
https://dicksdeathabove.xyz/~mia/psh-fractional
synced 2024-11-09 16:44:41 +00:00
45 lines
1.1 KiB
Bash
Executable file
45 lines
1.1 KiB
Bash
Executable file
#!/bin/sh
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countd() { # count decimal places
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m="$1"; n=${2:-0}; while [ "$m" ]; do
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: $((n+=1))
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next="${m%?}"
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[ "${m#$next}" = "." ] && {
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: $((n-=1))
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break
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} || {
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m="$next"
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}
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done
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echo "$n"
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}
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ad(){ # add decimal to $1 based on $2
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m="$1"; n=0; while [ "$m" ]; do
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next="${m%?}"
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[ "$n" -eq "$2" ] && break
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e="${m#$next}${e}"
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m="$next"; : $((n+=1))
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done
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w="${1%$e}"; echo "${w:-0}.${e%0}"
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}
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[ -z "${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="${2#*.}"
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elif [ ! -z "${2##*.*}" ]; then
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set -- "$1" "${2}.0"; d="${2#*.}"; d2="${1#*.}"
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fi # if $1/$2 is not a float; convert to float
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dn="$(countd $2 $(countd $1))"; m1="${1%.*}${1#*.}"; m2="${2%.*}${2#*.}"
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until [ "${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="${m2#0}"
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done # dash has issues when numbers have leading 0's
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# zsh,bash,etc don't need this at all
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# and really dash shouldn't either but /shrug
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#printf '%s\n%s\n' "${m1}*${m2}" "9223372036854775807"
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ad "$((m1*m2))" "$dn"
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