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float.sh
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float.sh
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#!/usr/bin/env bash
# The MIT License (MIT)
#
# Copyright (c) 2021-2024 Yegor Bugayenko
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included
# in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
#!/bin/bash
# Function to check if a string is a valid float number
is_float() {
local re="^-?[0-9]*\.?[0-9]+$"
[[ $1 =~ $re ]]
}
set -e
set -o pipefail
num=$(cat)
# Check if the input is empty or consists of only spaces
if [[ -z "${num}" || "${num}" =~ ^[[:space:]]+$ ]]; then
echo "0.000" # Return default value for empty input or input with spaces
exit
fi
if [ "${num}" == 'NaN' ]; then
printf '%s' "${num}"
exit
fi
# Check if the input is a valid float number
if ! is_float "$num"; then
echo "0.000"
exit 1
fi
num_truncated=$(echo "$num * 1000 / 1" | bc)
# Divide by 1000 to get back to the correct scale and format to three decimal places
(LC_NUMERIC=C printf '%.3f' $(echo "$num_truncated / 1000" | bc -l) 2>/dev/null || echo "0.000")