#!/bin/bash

c=

while [ ${c} -eq   ]

do

echo "请输入第一个数"

read a

echo "请输入第二个数"

read b

if [[ ${b} != *[!]* ]] && [[ ${a} != *[!]* ]] && [ -n "${a}"  ] && [ -n "${b}" ]  ;

then

sleep

echo "   "

echo "   "

echo "和为:"`echo $(( ${a} + ${b} ))`

echo "差为:"`echo $(( ${a} - ${b} ))`

echo "积为:"`echo $(( ${a} * ${b}))`

echo "   "

sleep

echo -e "\033[33m除数为0,无法进行除法运算以及取余运算！\033[0m"

c=$(( ${c} +  ))

elif [[ ${a} != *[!]* ]] && [[ ${b} != *[!]* ]] && [ -n "${a}" ] && [ -n "${b}" ] ;

then

sleep

echo "  "

echo "  "

echo "和为:"`echo $(( ${a} + ${b} ))`

echo "差为:"`echo $(( ${a} - ${b} ))`

echo "商为:"`echo $(( ${a} / ${b} ))`

echo "积为:"`echo $(( ${a} * ${b}))`

echo "余数为:"`echo  $(( ${a} % ${b}))`

c=$(( ${c} +  ))

else

sleep 

echo "  "

echo -e "\033[31m输入错误，请从新输入正确的值！\033[0m"

echo "  "

fi

done