用Linux shell編的一個小計算機__Linux

#!/bin/sh

echo  -n "welcome to my programming world"

echo  -n "This program is a calculator"

operator=" +      -      x    /  exit "

echo "please input two digits:"

read number1 number2

select  i  in $operator

do

case $i  in

+)

result=$(($number1+$number2))

echo "$number1+$number2=$result"

;;

-)

result=$($(number1-$number2))

echo "$number1-$number2=$result"

;;

X)

result=$(($number1 * $number2))

echo "$number1 X $number2=$result"

;;

/)

result=$(($number1 / $number2))

echo "$number1 / $number2=$result"

;;

exit )

echo "byebye"

exit 0

;;

done

這個程式其實還不完善，比如在做除法時，並沒有判斷除數不能為0這個特點，其實可以用WHILE語句來

進行判斷。