Question

Write a short bash script that takes in two arguments from a user, asks the user whether they would like to add, subtract, multiply, or divide. Each of these operations must be a function that returns data.

Answer 1

1). ANSWER :

GIVENTHAT :

To Write a short bash script that takes in two arguments from a user, asks the user whether they would like to add, subtract, multiply, or divide. Each of these operations must be a function that returns data.

The required script is given below -

Explanation -

1. In this code there are four functions for each operation which calculates the result in result variable and returns it back
2. User enters two numbers num1 and num2 along with the operation "+", "-", "*" and "/".
3. The $oper variable is compared against the four operators and calculates result to which it matches.
4. In every if condition branch the function is called as Sum $num1 $num2 where $num1 and $num2 are parameters to the function. Inside sum the parameters are fetched by $1 and $2 where $1 is $num1 and $2 is $num2 .

#!/bin/bash # Code to ask numbers from user and perform operations like, +,-,*,/ #function to add Sum(){    result=$(echo "$1 + $2"|bc)    return $result } #function to subtract Subtract(){    result=$(echo "$1 - $2"|bc)    return $result } #function to multiply Multiply(){    result=$(echo "$1 * $2"|bc)    return $result } #function to divide Division(){    result=$(echo "$1 / $2"|bc)    return $result } #reading two numbers and operation read -p "Enter first number : " num1 read -p "Enter second number : " num2 read -p "Enter the operation : " oper result=0 #checking for operations and calling the corresponsing function if [ "$oper" = "+" ] then    Sum $num1 $num2    result=$?    echo "The sum is : $result " fi if [ "$oper" = "-" ] then    Subtract $num1 $num2    result=$?    echo "The Difference is : $result " fi if [ "$oper" = "*" ] then    Multiply $num1 $num2    result=$?    echo "The Multiplication result is : $result " fi if [ "$oper" = "/" ] then    Division $num1 $num2    result=$?    echo "The result of division is : $result " fi

Refer to the screenshot below for code and output -

Output -