Calculator creation in Unix

Write a shell script(small calculator) that adds, subtracts, multiplies and divides the given two integers. 
There are two division options: one returns the quotient and the other  returns reminder. 
The script requires 3 arguments: The operation to be used and two integer numbers.The options are add(-a), subtract(-s), multiply(-m), quotient(-c) and reminder(-r). 


echo "Enter First Value "
read x
echo "Enter Second Value "
read y
while  [$q –ne 0 ]
do
echo “Enter –a for adding”
echo “Enter –s for subtraction”
echo “Enter –m for multiplication”
echo “Enter –c for Quotient”
echo “Enter –r for reminder”
read s
case $s in
-a)  p=`expr $x + $y`
     Echo "Sum = $p"
;;
-b)  p=`expr $x - $y`
     Echo "difference  = $p"
;;
-m)  p=`expr $x \* $y`
     Echo "Product = $p"
;;

-c)  p=`expr $x / $y`
     Echo "quotient = $p"

;;

-r)  p=`expr $x % $y`
     Echo “reminder = $p"
;;

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