e-manuele / best-practice-exam_ires_2023

best-practice-exam_ires_2023

src.OldFashionPound

A library (package src.OldFashionPound) implementing the 4 arithmetic operations (sum, subtraction, multiplication and division) for pre-1970 UK prices.

Under the old money system of UK, before 1970, there were 12 pence in a shilling and 20 shillings, or 240 pence, in a pound. Thus, a price in th OldUK Money system was expressed in Pounds, Shillings and Pence.

For example "12p 6s 10d" is 12 Pounds, 6 Shillings and 10 Pence.

Sum and Subtraction should add or subtract two prices respectively.

Example SUM:                 

• 5p 17s 8d + 3p 4s 10d = 9p 2s 6d

Example SUBTRACTION:              

• 5p 17s 8d - 3p 4s 10d = 2p 12s 10d

Subtractions giving negative results are managed:

• 5p 17s 8d - 5p 18s 8d = 0d (-1s 0d)

Multiplication and division will multiply or divide a price by an integer

Example MULTIPLICATION:        

• 5p 17s 8d * 2 = 11p 15s 4d

Example DIVISION:

• 5p 17s 8d / 3 = 1p 19s 2d (2p)

Another Example DIVISION         

• 18p 16s 1d / 15 = 1p 5s 0d (1s 1d)

PART 2

Implements sequentials arithmetic operations with src.OldFashionPound

Example SUM:                 

• 1p 1s 1d + 1p 1s 1d + 1p 1s 1d = 3p 3s 3d

PART 3

Create a command line interface that could read your operation in a specified format and be able to return the correct result

Usage

$ java -jar path/to/src.OldFashionPound-X.X.X.jar [expression]

Expression must follow one of this rule:

• Xp Ys Zd [+|-] Ap Bs Cd
• Xp Ys Zd [*|/] K