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Курс във Факултета по Математика и Информатика към СУ

Решение на Шеста задача от Христо Владев

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Към профила на Христо Владев

Резултати

  • 3 точки от тестове
  • 0 бонус точки
  • 3 точки общо
  • 20 успешни тест(а)
  • 27 неуспешни тест(а)

Код

require 'bigdecimal'
require 'bigdecimal/util'
# TODO: Exceptions.
class ExchangeRate
def initialize
@rates = {}
end
def set(from_currency, to_currency, rate)
return if from_currency == to_currency
@rates[exchange from_currency, to_currency] = rate
@rates[exchange to_currency, from_currency] = 1 / rate
end
def get(from_currency, to_currency)
@rates[exchange from_currency, to_currency]
end
def convert(from_currency, to_currency, amount)
return amount if from_currency == to_currency
amount * @rates[exchange from_currency, to_currency]
end
private
def exchange(from_currency, to_currency)
"#{from_currency.to_s}2#{to_currency.to_s}"
end
end
class Money
include Comparable
attr_reader :amount, :currency
def initialize(amount, currency)
@amount, @currency = amount, currency
end
def to_s
"#{'%.2f' % @amount} #{@currency.to_s}"
end
def in(currency, exchange_rate)
converted_amount = @amount * exchange_rate.get(@currency, currency)
Money.new converted_amount, currency
end
def *(multiplier)
Money.new @amount * multiplier, @currency
end
def /(divider)
Money.new @amount / divider, @currency
end
def +(money)
Money.new self.amount + money.amount, currency
end
def -(money)
Money.new self.amount - money.amount, currency
end
def <=>(money)
self.amount <=> money.amount
end
end

Лог от изпълнението

.......FFF.......FF.F.FF.FF.FFFFF..FFFFFFFFFFFF

Failures:

  1) ExchangeRate#get always returns 1 as the exchange rate between two identical currencies
     Failure/Error: rate.get(:JPY, :JPY).should eq 1.to_d
       
       expected: #<BigDecimal:8f6ea20,'0.1E1',9(36)>
            got: nil
       
       (compared using ==)
     # /tmp/d20130203-23049-kndwsq/spec.rb:45:in `block (3 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) ExchangeRate#get does not allow changing the exchange rate between two identical currencies
     Failure/Error: rate.get(:EUR, :EUR).should eq 1.to_d
       
       expected: #<BigDecimal:8f71db0,'0.1E1',9(36)>
            got: nil
       
       (compared using ==)
     # /tmp/d20130203-23049-kndwsq/spec.rb:50:in `block (3 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)>'

  3) ExchangeRate#convert raises an ExchangeRate::Unknown exception when the rate is not defined
     Failure/Error: end.to raise_error(ExchangeRate::Unknown)
     NameError:
       uninitialized constant ExchangeRate::Unknown
     # /tmp/d20130203-23049-kndwsq/spec.rb:58:in `block (3 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)>'

  4) Money convertion does not change the amount if the same currency is passed
     Failure/Error: Money.new(5.to_d, :EUR).in(:EUR, ExchangeRate.new).amount.should eq 5.to_d
     TypeError:
       nil can't be coerced into BigDecimal
     # /tmp/d20130203-23049-kndwsq/solution.rb:49:in `*'
     # /tmp/d20130203-23049-kndwsq/solution.rb:49:in `in'
     # /tmp/d20130203-23049-kndwsq/spec.rb:107:in `block (3 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)>'

  5) Money convertion raises an ExchangeRate::Unknown exception for unknown rates
     Failure/Error: end.to raise_error(ExchangeRate::Unknown)
     NameError:
       uninitialized constant ExchangeRate::Unknown
     # /tmp/d20130203-23049-kndwsq/spec.rb:113:in `block (3 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)>'

  6) Money arithmetic * with money objects raises an ArgumentError
     Failure/Error: expect do
       expected ArgumentError, got #<TypeError: Money can't be coerced into BigDecimal>
     # /tmp/d20130203-23049-kndwsq/spec.rb:129: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)>'

  7) Money arithmetic / with money objects raises an ArgumentError
     Failure/Error: expect do
       expected ArgumentError, got #<TypeError: Money can't be coerced into BigDecimal>
     # /tmp/d20130203-23049-kndwsq/spec.rb:129: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)>'

  8) Money arithmetic + with numeric objects raises an ArgumentError
     Failure/Error: expect do
       expected ArgumentError, got #<NoMethodError: undefined method `amount' for 42:Fixnum>
     # /tmp/d20130203-23049-kndwsq/spec.rb:137: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)>'

  9) Money arithmetic raises Money::IncompatibleCurrencies for + with money with different currencies
     Failure/Error: end.to raise_error(Money::IncompatibleCurrencies)
     NameError:
       uninitialized constant Money::IncompatibleCurrencies
     # /tmp/d20130203-23049-kndwsq/spec.rb:154: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)>'

  10) Money arithmetic - with numeric objects raises an ArgumentError
     Failure/Error: expect do
       expected ArgumentError, got #<NoMethodError: undefined method `amount' for 42:Fixnum>
     # /tmp/d20130203-23049-kndwsq/spec.rb:137: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)>'

  11) Money arithmetic raises Money::IncompatibleCurrencies for - with money with different currencies
     Failure/Error: end.to raise_error(Money::IncompatibleCurrencies)
     NameError:
       uninitialized constant Money::IncompatibleCurrencies
     # /tmp/d20130203-23049-kndwsq/spec.rb:154: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)>'

  12) Money arithmetic + with other objects raises an ArgumentError
     Failure/Error: expect do
       expected ArgumentError, got #<NoMethodError: undefined method `amount' for "foobar":String>
     # /tmp/d20130203-23049-kndwsq/spec.rb:160: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)>'

  13) Money arithmetic - with other objects raises an ArgumentError
     Failure/Error: expect do
       expected ArgumentError, got #<NoMethodError: undefined method `amount' for "foobar":String>
     # /tmp/d20130203-23049-kndwsq/spec.rb:160: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)>'

  14) Money arithmetic * with other objects raises an ArgumentError
     Failure/Error: expect do
       expected ArgumentError, got #<TypeError: String can't be coerced into BigDecimal>
     # /tmp/d20130203-23049-kndwsq/spec.rb:160: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)>'

  15) Money arithmetic / with other objects raises an ArgumentError
     Failure/Error: expect do
       expected ArgumentError, got #<TypeError: String can't be coerced into BigDecimal>
     # /tmp/d20130203-23049-kndwsq/spec.rb:160: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)>'

  16) Money comparison with <=> raises ArgumentError when comparing with other objects
     Failure/Error: expect do
       expected ArgumentError, got #<NoMethodError: undefined method `amount' for :larodi:Symbol>
     # /tmp/d20130203-23049-kndwsq/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)>'

  17) Money comparison with <=> raises IncompatibleCurrencies when currencies differ
     Failure/Error: end.to raise_error(Money::IncompatibleCurrencies)
     NameError:
       uninitialized constant Money::IncompatibleCurrencies
     # /tmp/d20130203-23049-kndwsq/spec.rb:203: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)>'

  18) Money comparison with == raises ArgumentError when comparing with other objects
     Failure/Error: expect do
       expected ArgumentError but nothing was raised
     # /tmp/d20130203-23049-kndwsq/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)>'

  19) Money comparison with == raises IncompatibleCurrencies when currencies differ
     Failure/Error: end.to raise_error(Money::IncompatibleCurrencies)
     NameError:
       uninitialized constant Money::IncompatibleCurrencies
     # /tmp/d20130203-23049-kndwsq/spec.rb:203: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)>'

  20) Money comparison with < raises ArgumentError when comparing with other objects
     Failure/Error: expect do
       expected ArgumentError, got #<NoMethodError: undefined method `amount' for :larodi:Symbol>
     # /tmp/d20130203-23049-kndwsq/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)>'

  21) Money comparison with < raises IncompatibleCurrencies when currencies differ
     Failure/Error: end.to raise_error(Money::IncompatibleCurrencies)
     NameError:
       uninitialized constant Money::IncompatibleCurrencies
     # /tmp/d20130203-23049-kndwsq/spec.rb:203: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)>'

  22) Money comparison with <= raises ArgumentError when comparing with other objects
     Failure/Error: expect do
       expected ArgumentError, got #<NoMethodError: undefined method `amount' for :larodi:Symbol>
     # /tmp/d20130203-23049-kndwsq/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)>'

  23) Money comparison with <= raises IncompatibleCurrencies when currencies differ
     Failure/Error: end.to raise_error(Money::IncompatibleCurrencies)
     NameError:
       uninitialized constant Money::IncompatibleCurrencies
     # /tmp/d20130203-23049-kndwsq/spec.rb:203: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)>'

  24) Money comparison with > raises ArgumentError when comparing with other objects
     Failure/Error: expect do
       expected ArgumentError, got #<NoMethodError: undefined method `amount' for :larodi:Symbol>
     # /tmp/d20130203-23049-kndwsq/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)>'

  25) Money comparison with > raises IncompatibleCurrencies when currencies differ
     Failure/Error: end.to raise_error(Money::IncompatibleCurrencies)
     NameError:
       uninitialized constant Money::IncompatibleCurrencies
     # /tmp/d20130203-23049-kndwsq/spec.rb:203: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)>'

  26) Money comparison with >= raises ArgumentError when comparing with other objects
     Failure/Error: expect do
       expected ArgumentError, got #<NoMethodError: undefined method `amount' for :larodi:Symbol>
     # /tmp/d20130203-23049-kndwsq/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)>'

  27) Money comparison with >= raises IncompatibleCurrencies when currencies differ
     Failure/Error: end.to raise_error(Money::IncompatibleCurrencies)
     NameError:
       uninitialized constant Money::IncompatibleCurrencies
     # /tmp/d20130203-23049-kndwsq/spec.rb:203: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 0.07053 seconds
47 examples, 27 failures

Failed examples:

rspec /tmp/d20130203-23049-kndwsq/spec.rb:44 # ExchangeRate#get always returns 1 as the exchange rate between two identical currencies
rspec /tmp/d20130203-23049-kndwsq/spec.rb:48 # ExchangeRate#get does not allow changing the exchange rate between two identical currencies
rspec /tmp/d20130203-23049-kndwsq/spec.rb:55 # ExchangeRate#convert raises an ExchangeRate::Unknown exception when the rate is not defined
rspec /tmp/d20130203-23049-kndwsq/spec.rb:106 # Money convertion does not change the amount if the same currency is passed
rspec /tmp/d20130203-23049-kndwsq/spec.rb:110 # Money convertion raises an ExchangeRate::Unknown exception for unknown rates
rspec /tmp/d20130203-23049-kndwsq/spec.rb:128 # Money arithmetic * with money objects raises an ArgumentError
rspec /tmp/d20130203-23049-kndwsq/spec.rb:128 # Money arithmetic / with money objects raises an ArgumentError
rspec /tmp/d20130203-23049-kndwsq/spec.rb:136 # Money arithmetic + with numeric objects raises an ArgumentError
rspec /tmp/d20130203-23049-kndwsq/spec.rb:151 # Money arithmetic raises Money::IncompatibleCurrencies for + with money with different currencies
rspec /tmp/d20130203-23049-kndwsq/spec.rb:136 # Money arithmetic - with numeric objects raises an ArgumentError
rspec /tmp/d20130203-23049-kndwsq/spec.rb:151 # Money arithmetic raises Money::IncompatibleCurrencies for - with money with different currencies
rspec /tmp/d20130203-23049-kndwsq/spec.rb:159 # Money arithmetic + with other objects raises an ArgumentError
rspec /tmp/d20130203-23049-kndwsq/spec.rb:159 # Money arithmetic - with other objects raises an ArgumentError
rspec /tmp/d20130203-23049-kndwsq/spec.rb:159 # Money arithmetic * with other objects raises an ArgumentError
rspec /tmp/d20130203-23049-kndwsq/spec.rb:159 # Money arithmetic / with other objects raises an ArgumentError
rspec /tmp/d20130203-23049-kndwsq/spec.rb:194 # Money comparison with <=> raises ArgumentError when comparing with other objects
rspec /tmp/d20130203-23049-kndwsq/spec.rb:200 # Money comparison with <=> raises IncompatibleCurrencies when currencies differ
rspec /tmp/d20130203-23049-kndwsq/spec.rb:194 # Money comparison with == raises ArgumentError when comparing with other objects
rspec /tmp/d20130203-23049-kndwsq/spec.rb:200 # Money comparison with == raises IncompatibleCurrencies when currencies differ
rspec /tmp/d20130203-23049-kndwsq/spec.rb:194 # Money comparison with < raises ArgumentError when comparing with other objects
rspec /tmp/d20130203-23049-kndwsq/spec.rb:200 # Money comparison with < raises IncompatibleCurrencies when currencies differ
rspec /tmp/d20130203-23049-kndwsq/spec.rb:194 # Money comparison with <= raises ArgumentError when comparing with other objects
rspec /tmp/d20130203-23049-kndwsq/spec.rb:200 # Money comparison with <= raises IncompatibleCurrencies when currencies differ
rspec /tmp/d20130203-23049-kndwsq/spec.rb:194 # Money comparison with > raises ArgumentError when comparing with other objects
rspec /tmp/d20130203-23049-kndwsq/spec.rb:200 # Money comparison with > raises IncompatibleCurrencies when currencies differ
rspec /tmp/d20130203-23049-kndwsq/spec.rb:194 # Money comparison with >= raises ArgumentError when comparing with other objects
rspec /tmp/d20130203-23049-kndwsq/spec.rb:200 # Money comparison with >= raises IncompatibleCurrencies when currencies differ

История (1 версия и 0 коментара)

Христо обнови решението на 16.01.2013 16:44 (преди почти 12 години)

+require 'bigdecimal'
+require 'bigdecimal/util'
+
+# TODO: Exceptions.
+
+class ExchangeRate
+ def initialize
+ @rates = {}
+ end
+
+ def set(from_currency, to_currency, rate)
+ return if from_currency == to_currency
+
+ @rates[exchange from_currency, to_currency] = rate
+ @rates[exchange to_currency, from_currency] = 1 / rate
+ end
+
+ def get(from_currency, to_currency)
+ @rates[exchange from_currency, to_currency]
+ end
+
+ def convert(from_currency, to_currency, amount)
+ return amount if from_currency == to_currency
+
+ amount * @rates[exchange from_currency, to_currency]
+ end
+
+ private
+
+ def exchange(from_currency, to_currency)
+ "#{from_currency.to_s}2#{to_currency.to_s}"
+ end
+end
+
+class Money
+ include Comparable
+
+ attr_reader :amount, :currency
+
+ def initialize(amount, currency)
+ @amount, @currency = amount, currency
+ end
+
+ def to_s
+ "#{'%.2f' % @amount} #{@currency.to_s}"
+ end
+
+ def in(currency, exchange_rate)
+ converted_amount = @amount * exchange_rate.get(@currency, currency)
+
+ Money.new converted_amount, currency
+ end
+
+ def *(multiplier)
+ Money.new @amount * multiplier, @currency
+ end
+
+ def /(divider)
+ Money.new @amount / divider, @currency
+ end
+
+ def +(money)
+ Money.new self.amount + money.amount, currency
+ end
+
+ def -(money)
+ Money.new self.amount - money.amount, currency
+ end
+
+ def <=>(money)
+ self.amount <=> money.amount
+ end
+end