Make a Code For Calculator in Linux Shell Scripts

echo "Enter the First Number:->";
read no1
echo "Enter The Second Number:->";
read no2

echo "1:Addition";
echo "2:Substraction";
echo "3:Multiplication";
echo "4:Division";


while ((1))
do
    echo "Enter The Above Choice:->";
    read c
   
    case $c in
        1) echo "Addition is:->" `expr $no1 + $no2`;
            ;;
   
        2) echo "Substraction is:->" `expr $no1 - $no2`;
            ;;

        3) echo "Multiplication is:->" `expr $no1 \* $no2`;
            ;;

        4) echo "Division is:->" `expr $no1 / $no2`;
            ;;

        0) exit
            ;;
    *) echo "Please Enter Valid Choice:";
        ;;

    esac

done