mirror of
https://dicksdeathabove.xyz/~mia/psh-fractional
synced 2024-09-19 16:40:44 +00:00
42 lines
949 B
Bash
Executable file
42 lines
949 B
Bash
Executable file
#!/bin/sh
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# $1 * $2
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# count the total decimal places
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countd() {
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[ -z "${1##*.*}" ] && {
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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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break
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} || {
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m="$next"
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}
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done
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} || n=1
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echo "$n"
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}
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[ -z "${1##*.*}" -o -z "${2##*.*}" ] || { # if not floats
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echo "$(($1*$2))"
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exit 0
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}
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dn=$(countd "$2" $(countd "$1")); [ "$dn" -gt 2 ] && : $((dn-=2)) # decimal count
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#echo "$dn | $(countd $1) -- $(countd $2)"
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# remove all decimal places
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if [ ! -z "${1##*.*}" ]; then # if $1 is not float
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set -- "$1" "${2%.*}${2#*.}"
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elif [ ! -z "${2##*.*}" ]; then
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set -- "${1%.*}${1#*.}" "$2"
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else
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set -- "${1%.*}${1#*.}" "${2%.*}${2#*.}"
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fi
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#echo "$1 * $2"
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o="$(($1*$2))"
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# add back decimal point using $dn
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n=0; m="$o"; [ "$dn" -gt 0 ] && while [ "$m" ]; do
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next="${m%?}"
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: $((n+=1))
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[ "$n" -eq "$dn" ] && o="$next.${o#${m%?}}"
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m="$next"
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done
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echo "$o"
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