Practical no-2 :Shell Script to make a menu driven oprations

Practical no-2 :Shell Script to make a menu driven oprations

clear

sum=0

i="y"

echo " Enter one no."

read n1

echo "Enter second no."

read n2

while [ $i = "y" ]

do

echo "1.Addition"

echo "2.Subtraction"

echo "3.Multiplication"

echo "4.Division"

echo "Enter your choice"

read ch

case $ch in

    1)sum=`expr $n1 + $n2`

     echo "Sum ="$sum;;

    2)sum=`expr $n1 - $n2`

     echo "Sub = "$sum;;

    3)sum=`expr $n1 \* $n2`

     echo "Mul = "$sum;;

    4)sum=`expr $n1 / $n2`

     echo "Div = "$sum;;

    *)echo "Invalid choice";;

esac

echo "Do u want to continue ?"

read i

if [ $i != "y" ]

then

    exit

fi

done   

OUTPUT

***********

[root @LINTEL]$ sh calculator.sh

Enter any no.

121

 Enter one no.

 21

 Enter second no.

 58

 1.Addition

 2.Subtraction

 3.Multiplication

 4.Division

 Enter your choice

 1

 Sum =79

 Do u want to continue ?

 y

 1.Addition

 2.Subtraction

 3.Multiplication

 4.Division

 Enter your choice

 2

 Sub = -37

 Do u want to continue ?

 y

 1.Addition

 2.Subtraction

 3.Multiplication

 4.Division

 Enter your choice

 3

 Mul = 1218

 Do u want to continue ?

 y

 1.Addition

 2.Subtraction

 3.Multiplication

 4.Division

 Enter your choice

 4

 Div = 0

 Do u want to continue ?

 n