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Курс във Факултета по Математика и Информатика към СУ

Решение на Шеста задача от Иван Георгиев

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Към профила на Иван Георгиев

Резултати

  • 6 точки от тестове
  • 0 бонус точки
  • 6 точки общо
  • 45 успешни тест(а)
  • 2 неуспешни тест(а)

Код

require 'bigdecimal'
require 'bigdecimal/util'
class ExchangeRate
class Unknown < RuntimeError
end
def initialize
@courses = {}
end
def set(from_currency, to_currency, rate)
@courses[[from_currency, to_currency]] = rate
@courses[[to_currency, from_currency]] = 1 / rate
end
def get(from_currency, to_currency)
if from_currency == to_currency then 1.to_d
else @courses[[from_currency, to_currency]]
end
end
def convert(from_currency, to_currency, amount)
if from_currency == to_currency then amount
elsif @courses[[from_currency, to_currency]]
(@courses[[from_currency, to_currency]] * amount).to_d
else raise ExchangeRate::Unknown
end
end
end
class Money
include Comparable
class IncompatibleCurrencies < ArgumentError
end
attr_reader :currency, :amount
def initialize(amount, currency)
@amount = amount
@currency = currency
end
def <=>(other)
if not other.class.to_s == 'Money' then raise ArgumentError
elsif not @currency == other.currency then raise Money::IncompatibleCurrencies
else @amount <=> other.amount
end
end
def transform(number)
if /\A*\.\d\z/ =~ number then number + '0'
else number
end
end
def to_s
"#{transform @amount.to_f.round(2).to_s } #{@currency}"
end
def in(current_currency, exchange_rate)
new_amount = exchange_rate.convert(@currency, current_currency, @amount)
Money.new(new_amount, current_currency)
end
def +(other)
if not other.class.to_s == 'Money' then raise ArgumentError
elsif not @currency == other.currency then raise Money::IncompatibleCurrencies
else Money.new amount + other.amount, currency
end
end
def -(other)
if not other.class.to_s == 'Money' then raise ArgumentError
elsif not @currency == other.currency then raise Money::IncompatibleCurrencies
else Money.new amount - other.amount, currency
end
end
def *(number)
if not number.is_a? Numeric then raise ArgumentError
else Money.new amount * number, currency
end
end
def /(number)
if not number.is_a? Numeric then raise ArgumentError
else Money.new amount / number, currency
end
end
end

Лог от изпълнението

.....................................FF........

Failures:

  1) Money comparison with == raises ArgumentError when comparing with other objects
     Failure/Error: expect do
       expected ArgumentError but nothing was raised
     # /tmp/d20130203-23049-resvkr/spec.rb:195:in `block (4 levels) in <top (required)>'
     # ./lib/homework/run_with_timeout.rb:5:in `block (3 levels) in <top (required)>'
     # ./lib/homework/run_with_timeout.rb:5:in `block (2 levels) in <top (required)>'

  2) Money comparison with == raises IncompatibleCurrencies when currencies differ
     Failure/Error: expect do
       expected Money::IncompatibleCurrencies but nothing was raised
     # /tmp/d20130203-23049-resvkr/spec.rb:201:in `block (4 levels) in <top (required)>'
     # ./lib/homework/run_with_timeout.rb:5:in `block (3 levels) in <top (required)>'
     # ./lib/homework/run_with_timeout.rb:5:in `block (2 levels) in <top (required)>'

Finished in 0.05761 seconds
47 examples, 2 failures

Failed examples:

rspec /tmp/d20130203-23049-resvkr/spec.rb:194 # Money comparison with == raises ArgumentError when comparing with other objects
rspec /tmp/d20130203-23049-resvkr/spec.rb:200 # Money comparison with == raises IncompatibleCurrencies when currencies differ

История (1 версия и 0 коментара)

Иван обнови решението на 12.01.2013 23:02 (преди около 12 години)

+require 'bigdecimal'
+require 'bigdecimal/util'
+
+class ExchangeRate
+ class Unknown < RuntimeError
+ end
+
+ def initialize
+ @courses = {}
+ end
+
+ def set(from_currency, to_currency, rate)
+ @courses[[from_currency, to_currency]] = rate
+ @courses[[to_currency, from_currency]] = 1 / rate
+ end
+
+ def get(from_currency, to_currency)
+ if from_currency == to_currency then 1.to_d
+ else @courses[[from_currency, to_currency]]
+ end
+ end
+
+ def convert(from_currency, to_currency, amount)
+ if from_currency == to_currency then amount
+ elsif @courses[[from_currency, to_currency]]
+ (@courses[[from_currency, to_currency]] * amount).to_d
+ else raise ExchangeRate::Unknown
+ end
+ end
+end
+
+class Money
+ include Comparable
+
+ class IncompatibleCurrencies < ArgumentError
+ end
+
+ attr_reader :currency, :amount
+
+ def initialize(amount, currency)
+ @amount = amount
+ @currency = currency
+ end
+
+ def <=>(other)
+ if not other.class.to_s == 'Money' then raise ArgumentError
+ elsif not @currency == other.currency then raise Money::IncompatibleCurrencies
+ else @amount <=> other.amount
+ end
+ end
+
+ def transform(number)
+ if /\A*\.\d\z/ =~ number then number + '0'
+ else number
+ end
+ end
+
+ def to_s
+ "#{transform @amount.to_f.round(2).to_s } #{@currency}"
+ end
+
+ def in(current_currency, exchange_rate)
+ new_amount = exchange_rate.convert(@currency, current_currency, @amount)
+ Money.new(new_amount, current_currency)
+ end
+
+ def +(other)
+ if not other.class.to_s == 'Money' then raise ArgumentError
+ elsif not @currency == other.currency then raise Money::IncompatibleCurrencies
+ else Money.new amount + other.amount, currency
+ end
+ end
+
+ def -(other)
+ if not other.class.to_s == 'Money' then raise ArgumentError
+ elsif not @currency == other.currency then raise Money::IncompatibleCurrencies
+ else Money.new amount - other.amount, currency
+ end
+ end
+
+ def *(number)
+ if not number.is_a? Numeric then raise ArgumentError
+ else Money.new amount * number, currency
+ end
+ end
+
+ def /(number)
+ if not number.is_a? Numeric then raise ArgumentError
+ else Money.new amount / number, currency
+ end
+ end
+end