Created
May 23, 2020 15:43
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-module(bill). | |
-export([ | |
database/0, | |
bill/0, | |
print_bill/1 | |
]). | |
database() -> [ | |
{4719, "Fish Fingers" , 121}, | |
{5643, "Nappies" , 1010}, | |
{3814, "Orange Jelly", 56}, | |
{1111, "Hula Hoops", 21}, | |
{1112, "Hula Hoops (Giant)", 133}, | |
{1234, "Dry Sherry, 1lt", 540} | |
]. | |
bill() -> [1234,4719,3814,1112,1113,1234]. | |
%% | |
%% find_item(Number, Database) -> Record | |
%% | |
find_item(Item, []) -> {Item, "Unknown Item", 0}; | |
find_item(Item, [{Item, _Description, _Value}=Record | _Records]) -> Record; | |
find_item(Item, [_Record | Records]) -> find_item(Item, Records). | |
%% | |
%% print_bill(Bill) -> ok | |
%% | |
print_bill(Bill) -> | |
print_header(), | |
Total = print_line(Bill, 0), | |
print_total(Total). | |
print_header() -> | |
io:format("~s~n~n", [string:pad("Erlang Stores", 40, both)]). | |
print_line([], Total) -> Total; | |
print_line([Item | Items], Total) -> | |
{_, Description, Value} = find_item(Item, database()), | |
io:format("~-30...s~10.2..f~n", [Description, Value/100]), | |
print_line(Items, Total + Value). | |
print_total(Total) -> | |
io:format("~n~-30...s~10.2..f~n", ["Total", Total/100]). |
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