#!/bin/sh
clear
echo "M   To do Multiplication"
echo "D   To do Division"
echo "Q   To quit"
read option
while [ $option != Q]

echo "Please enter a number"
read num1
echo "Please enter another number"
read num2
do
case $option in
        A)      echo  "THe sum of $num1 and $num2 is: `expr $num1 + $num2`";;
        S)      echo "The difference of $num1 and $num2 is: `expr $num1 - $num2`";;
        M)      echo "$num1 multiplied by $num2 is: `expr $num1 * $num2`";;
        D)      echo "$num1 divded by $num2 is: `expr $num1 / $num2`";;
        *)      echo "That was an invalid selection";;
esac
while [option = Q]
do
exit
echo "Good Bye"

while [ condition ]
do
    statements
done

# show menu
# prompt for option
read option
while [ $option != Q ]
do
    #prompt for num1
    read num1
    #prompt for num2
    read num2
    case $option in
        #
        #case stuff for the operations
        #
    esac
    # show menu
    # prompt for option
    read option
done

echo "Goodbye"