Cashpoint
Vending notes to a customer.
A cashpoint can dispense £20, £10 and £5 notes. It always dispenses the least number of notes for each withdrawal. For example, if the customer chose to withdraw £50 it would dispense 2x£20 notes and 1x£10 note.
The dispenser mechanism is an embedded system that receives the commands, "Wx", "D20", "D10" or "D5" as an input sequence from the main control unit. For example, £50 would be W50 D20 D20 D10.
Make
Write a program to output the minimum number of notes from an input value.
Use this boilerplate code as a starting point:
Success Criteria
Remember to add a comment before a subprogram, selection or iteration statement to explain its purpose.
Complete the subprogram called `dispense` that:
- Outputs the amount the user is withdrawing in the format "Wx" where x is a number.
- Outputs "D20", "D10" or "D5" the correct number of times for the withdrawal.
Complete the `main program` so that:
- The user can input the amount they wish to withdraw as a whole number.
Typical inputs and outputs from the program would be:
Enter the amount to withdraw: £50
W50
D20
D20
D10
Enter the amount to withdraw: £75
W75
D20
D20
D20
D10
D5
Knowledge Organiser
Use these resources as a reference to help you meet the success criteria.
Programming guide:
Flowcharts:
Parsons:
Evaluate
Run the unit tests below to check that your program has met the success criteria.
Enter the amount to withdraw: £0
W0
Enter the amount to withdraw: £90
W90
D20
D20
D20
D20
D10
Enter the amount to withdraw: £200
W200
D20
D20
D20
D20
D20
D20
D20
D20
D20
D20
Enter the amount to withdraw: £315
W315
D20
D20
D20
D20
D20
D20
D20
D20
D20
D20
D20
D20
D20
D20
D20
D10
D5
Check that you have:
- Used comments within the code to describe the purpose of subprograms, conditions and iterations.
- Used meaningful identifier names. That means the names of subprograms and variables indicate what they are for.
