Chapter 5 - Worked Examples

Exercise - Change Calculator

Imagine you are running a convenience store. It is not unusual for customers to pay above their total shopping cost – requiring you to return the change.

For example, a customer may have bought several items totalling to ₩10,540, to which he pays ₩11,000. You are obliged to return the change, ₩460, to the customer. This is done by returning:

• Four ₩100 notes

• One ₩50 coin

• One ₩10 coin

Create a program that can assist you in finding out how to provide change to a customer.

Specifications

The program should ask the user to enter:

• An integer representing the change, in won.

• You may assume that this number will always be greater than or equal to zero

The currency notes that the program supports as change should be:

• ₩5,000 note

• ₩1,000 note

• ₩500 coin

• ₩50 coin

• ₩10 coin

Any values that cannot be represented (for example ₩2), should be rounded down.

Example

Enter an amount in won : 9540

You can provide this change as follows:
₩5000 : 1
₩1000 : 4
₩500 : 1
₩50 : 0
₩10 : 4

You may find the division and modulo operator helpful for this exercise.