Minimum Sterling Coins and Pennies Evaluator

The minimum coin problem (with a twist!)

A simple repo for a program such that given a number of pennies, will calculate the minimum number of Sterling coins equivalent to that amount.

__        __   _                            _        
\ \      / /__| | ___ ___  _ __ ___   ___  | |_ ___  
 \ \ /\ / / _ \ |/ __/ _ \| '_ ` _ \ / _ \ | __/ _ \ 
  \ V  V /  __/ | (_| (_) | | | | | |  __/ | || (_) |
   \_/\_/ \___|_|\___\___/|_| |_| |_|\___|  \__\___/ 
                                                     
 __  __ _       _                           
|  \/  (_)_ __ (_)_ __ ___  _   _ _ __ ___  
| |\/| | | '_ \| | '_ ` _ \| | | | '_ ` _ \ 
| |  | | | | | | | | | | | | |_| | | | | | |
|_|  |_|_|_| |_|_|_| |_| |_|\__,_|_| |_| |_|
                                            
 ____  _            _ _                ____      _       
/ ___|| |_ ___ _ __| (_)_ __   __ _   / ___|___ (_)_ __  
\___ \| __/ _ \ '__| | | '_ \ / _` | | |   / _ \| | '_ \ 
 ___) | ||  __/ |  | | | | | | (_| | | |__| (_) | | | | |
|____/ \__\___|_|  |_|_|_| |_|\__, |  \____\___/|_|_| |_|
                              |___/                      
 _____            _             _             _ 
| ____|_   ____ _| |_   _  __ _| |_ ___  _ __| |
|  _| \ \ / / _` | | | | |/ _` | __/ _ \| '__| |
| |___ \ V / (_| | | |_| | (_| | || (_) | |  |_|
|_____| \_/ \__,_|_|\__,_|\__,_|\__\___/|_|  (_)

How it works

This version of the minimum coin problem processes the following Sterling coins and Pennies:

£2	£1	50p	20p
10p	5p	2p	1p

The evaluation process begins with basic filtering to account for input validation. This is subsequently followed by a bit of dynamic programming where the input is parsed through a top-down divisional minimization, starting with the highest coin.

The result is returned in a string (iterated and concatenated from a dictionary counter) describing the minimum number of coins used, based on the given input.

How to Run

• The program utilizes the following dependencies (all obtaininable via pip) for Terminal rich text design:

  • termcolor
  • pyfiglet
  • rich (Rich API)

• With the dependencies installed, from the Terminal directory, execute the main_routine.py file.

• The program should display the following (after the intial welcome message ASCII banner) in a console/terminal:

  • ENTER PENNIES (e.g. £2, £1, 50p, 20p, 10p, 5p, 2p and 1p):
    

• Given the following input (£14.83), the corresponding output is produced:

  •   ENTER PENNIES (e.g. £2, £1, 50p, 20p, 10p, 5p, 2p and 1p):
      £14.83  
      >>> £14.83 =  7 x £2, 1 x 50p, 1 x 20p, 1 x 10p, 1 x 2p, 1 x 1p
    

• Subsequent tabluation within the console is also added to mimic the feel and look of a web app:

  • Date & Time Received	Amount Received	Coin(s) Processed
    Tue Nov 9 17:58:56 2021	£14.83	12

  • 7 £2 Coins

    1 50p Coin

    1 20p Coin

    1 10p Coin

    1 2p Coin

    1 1p Coin

Test Data

In the first column is a string of user input, and in the second the desired integer expressed as pence.

Input	Pence Description
6	6 Single digit
75	75 Double digit
167p	167 Pence symbol
4p	4 Pence symbol single digit
1.97	197 Pounds decimal
£1.33	133 Pound symbol decimal
£2	200 Single digit pound symbol
£20	2000 Double digit pound symbol
£1.97p	197 Pound & pence symbol
£1p	Decimal 100 missing pence
£1.p	100 Missing pence, Decimal point present
001.61p	161 Buffered zeroes
6.235p	624 Rounding with pence symbol
£1.256532677p	126 Rounding with pound and pence symbols.

Likewise, the application should not accept the following inputs

Input	Pence	Description
	0	Empty string
1x	0	Non-numeric, non-symbol character
£1x.0p	0	Non-numeric, non-symbol character along with valid symbols
£p	0	Missing digits