Write a Shell Script which works like a calculator and performs below operations Addition, Subtract, Division and Multiplication

Write a Shell Script which works like a calculator and performs below operations Addition, Subtract, Division and Multiplication

echo "Enter number 1:"

read a

echo "Enter number 2:"

read b

echo "Operations:-"

echo "1. Addition"

echo "2. Subtraction"

echo "3. Multiplication"

echo "4. Division"

echo "Enter Choice :"

read ch

# For Addition

if [ $ch == 1 ]

then

ans=$(( $a + $b ))

echo "Addition = $ans"

# For Substraction

elif [ $ch == 2 ]

then

ans=$(( $a - $b ))

echo "Substraction = $ans"

# For Multiplication

elif [ $ch == 3 ]

then

ans=$(( $a * $b ))

echo "Multiplication = $ans"

# For Division

elif [ $ch == 4 ]

then

if [ $b != 0 ]

then

else

ans=$(( $a / $b ))

echo "Division = $ans"

echo "Please Enter non-zero value in number 2..."

fi

#Invalid Choice

else

echo "Invalid choice!"

fi