Question

Write a script called makeChange that prompts the user for a monetary amount in cents less than or equal to 99 cents (i.e. less than a loonie) and then prints how change would be made for that amount out of quarters (25-cent coins), dimes (10-cent coins), nickels (5-cent coins) and pennies (1-cent coins). The change your script specifies should be the minimum number of coins. For example, when making change for 88 cents, the result should indicate 3 quarters, 1 dime and 3 pennies. When done, your script should also ask the user if she would like to make change again. If the user enters y (or Y), the script should repeat. Here are three sample runs. Your script should run as follows (what I enter is in bold):

$ makeChange
Please enter an amount less than 100 (i.e. <=99 cents): 125
125 exceeds 99 cents. Try again: 109
109 exceeds 99 cents. Try again: 89
Your change is:
3 quarter(s)
1 dime(s)
4 pennie(s)
Would you like to make change again? y
Please enter an amount less than (i.e. <=99 cents): 144
144 exceeds 99 cents. Try again: 75
Your change is:
3 quarter(s)
Would you like to make change again? Y
Please enter an amount less than (i.e. <=99 cents): 93
Your change is:
3 quarter(s)
1 dime(s)
1 nickel(s)
3 pennie(s)
Would you like to make change again? Y
Please enter an amount less than (i.e. <=99 cents): 24
Your change is:
2 dime(s)
4 pennie(s)
Would you like to make change again? n
$

Hint: Use the % operator with expr to determine the remainder of dividing one number into another number. You will need to use the if and while commands.

Answer 1

BASH SCRIPT:

#!/bin/bash

again="y"

while [ $again == "Y" -o $again == 'y' ]

do

        echo -n "Please enter an amount less than 100: "

        read amount

        # Validate user input

        while [ $amount -ge 100 ]

        do

                echo -n "$amount exceeds 99 cents. Try again: "

                read amount

        done

        # Calculate changes

        quarters=`expr $amount / 25`

        dimes=`expr $amount % 25 / 10`

        nickels=`expr $amount % 25 % 10 / 5`

        pennies=`expr $amount % 25 % 10 % 5`

        # Display changes, if any coin is 0 then do not display it

        echo "Your change is:"

        if [ $quarters -gt 0 ]; then

                echo "$quarters quarter(s)"

        fi

        if [ $dimes -gt 0 ]; then

                echo "$dimes dime(s)"

        fi

        if [ $nickels -gt 0 ]; then

                echo "$nickels nickel(s)"

        fi

        if [ $pennies -gt 0 ]; then

                echo "$pennies pennie(s)"

        fi

        # Ask the user if he/she wants to continue

        echo -n "Would you like to make change again? "

        read again

done

SAMPLE OUTPUT: