Shell 实现计算器
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话不多说，上代码：
#!/bin/env sh
# Author: BlueMiaomiao
# E-mail: xv2017@outlook.com
# GitHub: bluemiaomiao.github.io
# Desc : Simple Computer Design
FIR_NUM=`echo $1 | awk -F ‘+|-|*|/‘ ‘{print $1}‘`
SEC_NUM=`echo $1 | awk -F ‘+|-|*|/‘ ‘{print $2}‘`
OPS_SYM=`echo $1 | sed ‘s/[0-9]//g‘`
if [ "$OPS_SYM" == ‘+‘ ]
then
echo "$FIR_NUM + $SEC_NUM = `expr $FIR_NUM + $SEC_NUM`"
elif [ "$OPS_SYM" == ‘-‘ ]
then
echo "$FIR_NUM - $SEC_NUM = `expr $FIR_NUM - $SEC_NUM`"
elif [ "$OPS_SYM" == ‘*‘ ]
then
echo "$FIR_NUM * $SEC_NUM = `expr $FIR_NUM * $SEC_NUM`"
elif [ "$OPS_SYM" == ‘/‘ ]
then
if [ "$SEC_NUM" == 0 ]
then
echo ‘Params error.‘
else
echo "$FIR_NUM ÷ $SEC_NUM = `expr $FIR_NUM / $SEC_NUM`"
fi
else
echo ‘Syntax error.‘
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