Write a script to perform arithmetic operation on digits of a given number




 #!/bin/bash

<<doc

Name : Omprakash A Timashetti

Date : 17/08/2022

Description : Write a script to perform arithmetic operation on digits of a given number


Sample Input :./operator_dependent.sh 1234+

Sample Output:Sum of digits = 10 


Sample Input:./operator_dependent.sh 8312-

Sample Output :Subtraction of digits = 2


Sample Input :./operator_dependent.sh 5487

Sample Output : Error: Operator missing or invalid operator, please pass operator as last digit (+,-,x,/


Sample Output :./operator_dependent.sh 1111x

Sample Output :Multiplication of digits = 1


Sample Input :./operator_dependent.sh 12/

Sample Output:Division of digits = .50


Sample Input : ./operator_dependent.sh

Sample Output : Error : Please pass the arguments through CL.

                Usage : ./operator_dependent.sh 2345+

doc


#Script to perform arithmatic operation on digits of a iven number


if [ $# -eq 1 ]                        #check for command line arguments

then

string=$1                              #istring of digit stored in one variable

operator=${string: -1}                 #to get last digit which is operator

                      

n=$((${#string}-2))                     #Get length of string and store it in variable n

case $operator in                      #Used case statement to perform operation 

    +)

    sum=${string:0:1}

      for i in `seq 1 $n`              #Addition of digits

      do

       sum=$(($sum+${string:$i:1}))

      done

     echo "Sum of digits = $sum"

     ;;


    -)

       sub=${string:0:1}

       for i in `seq 1 $n`              #Substraction of Digits

       do

         sub=$(($sub-${string:$i:1}))

       done

       echo "Substraction of digits = $sub"

       ;;

    x)

       mul=${string:0:1}

       for i in `seq 1 $n`

       do                               #Multiplication of Digits

       mul=$((${string:$i:1}*$mul))

       done

       echo "Multiplication of digits = $mul"

       ;; 

     

    /)   

       div=${string:0:1}

       for i in `seq 1 $n`

       do                                #Division of Digits

       div=`echo "scale=2; $div/${string:$i:1}" | bc` 

       done

       echo "Division of digits = $div"

       ;;

   *)

       echo "Error: Operator missing or invalid operator, please pass operator as last digit (+,-,x,/)"

        #if we dont pass any operator this error message will be printed

 esac

 else

     echo "Error : Please pass the arguments through CL." #If no argument passed this error message is printed

     echo "Usage : ./operator_dependent.sh 2345+"

 fi


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