Write a menu driven program using FUNCTION (Linux shell programming language) to

Question

Write a menu driven program using FUNCTION (Linux shell programming language) to test some of the arithmetic operators.

Example:

Main Menu

                        1--------------------------------ADD

                        2--------------------------------SUB

                        3--------------------------------MPY

4--------------------------------MOD

5--------------------------------DIV

                        6--------------------------------EXIT

The program must prompt user for input i.e.

Please enter two numbers to be added.

Also must print out the input and the result (output).

Explanation / Answer

Answer :

#!/bin/bash
# SCRIPT: ArithematicOperatins.sh
# USAGE:   ArithematicOperatins.sh
# PURPOSE: Add,Sub,Mpy,Mod,Div operations of two numbers.
                

clear                        #Clears Screen

Bold=""               #Storing escape sequences in a variable.
Normal=""

echo -e "$Bold Arithmetic Operations Using Linux Shell Programming $Normal "

items="
        1-----------ADD
        2-----------SUB
        3-----------MPY
        4-----------MOD
        5-----------DIV
        6-----------EXIT"

choice=

# simply remove functions and its entries from main script.

exit_function()
{
   clear
   exit
}

#Function enter is used to go back to menu and clears screen

enter()
{
   unset num1 num2
   ans=
   echo ""
   echo -e "Do you want to continue(y/n):c"
   stty -icanon min 0 time 0

# When -icanon is set then one character has been received.
# min 0 means that read should read 0 characters.
# time 0 ensures that read is terminated the moment one character
# is hit.

while [ -z "$ans" ]
do
   read ans
done

#The while loop ensures that so long as at least one character is not received read continue to get executed

if [ "$ans" = "y" -o "$ans" = "Y" ]
then
   stty sane          # Restoring terminal settings
   clear
else
   stty sane
   exit_function
fi
}

while true
do
   echo -e "$Bold    Main   MENU $Normal "
   echo -e " $items "
   echo -n "Enter your choice : "
   read choice

   case $choice in
     1) clear
        echo "Enter two numbers for ADD : "
        echo -n "Number1: "
        read num1
        echo -n "Number2: "
        read num2
        echo "$num1 + $num2 = `expr $num1 + $num2`"
        enter ;;
     2) clear
        echo "Enter two numbers for SUB : "
        echo -n "Number1: "
        read num1
        echo -n "Number2: "
        read num2
        echo "$num1 - $num2 = $((num1-num2))"
        enter ;;
     3) clear
        echo "Enter two numbers for MPY : "
        echo -n "Number1: "
        read num1
        echo -n "Number2: "
        read num2
        echo "$num1 * $num2 = `echo "$num1*$num2"|bc`"
        enter ;;
     4) clear
        echo "Enter two numbers for MOD : "
        echo -n "Number1: "
        read num1
        echo -n "Number2: "
        read num2
        echo "$num1 % $num2 = `echo "$num1%$num2"|bc`"
        enter ;;
    5) clear
        echo "Enter two numbers for DIV : "
        echo -n "Number1: "
        read num1
        echo -n "Number2: "
        read num2
        let div=num1/num2
        echo "$num1 / $num2 = $div"
        enter ;;
    6) exit_function ;;
    *) echo "You entered wrong option, Please enter 1,2,3,4,5 or 6"
        echo "Press enter to continue"
        read
        clear
   esac

done

Output :

Enter two numbers for ADD :

Number1: 45

Number2:32

45 + 32 = 77

Do you want to continue(y/n) :n

........................................................

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