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题目:超市结账系统 1.商品用大写字母来代替(A,B,C,...)。每个商品都单独计价,此外还有商品多个计价:买n个某商品,需要y美分。比如说,单个商品A需要价格是50美分,但是买三个商品A的价格是1.3美元。 2.定价表如下: Item Unit Price Special Price ------------------------------------- A 50 3 for 130 B 30 2 for 45 C 20 D 15 3.结账系统可以识别任何商品序列,比如我们扫描了一个B商品、一个A商品以及再一个B商品,结账系统就会识别到两个商品B并计价45美分(总价会是95美分)。 4.系统在进行结账之前可以制定定价规则。 5.结账系统的接口如下: co = CheckOut.new(pricing_rules) co.scan(item) co.scan(item) : : price = co.total 6.实现price方法,该方法接收一个商品序列字符串,并且对每个商品调用scan方法,最后返回商品总价。 class TestPrice < Test::Unit::TestCase def price(goods) co = CheckOut.new(RULES) goods.split(//).each { |item| co.scan(item) } co.total end def test_totals assert_equal( 0, price("")) assert_equal( 50, price("A")) assert_equal( 80, price("AB")) assert_equal(115, price("CDBA")) assert_equal(100, price("AA")) assert_equal(130, price("AAA")) assert_equal(180, price("AAAA")) assert_equal(230, price("AAAAA")) assert_equal(260, price("AAAAAA")) assert_equal(160, price("AAAB")) assert_equal(175, price("AAABB")) assert_equal(190, price("AAABBD")) assert_equal(190, price("DABABA")) end def test_incremental co = CheckOut.new(RULES) assert_equal( 0, co.total) co.scan("A"); assert_equal( 50, co.total) co.scan("B"); assert_equal( 80, co.total) co.scan("A"); assert_equal(130, co.total) co.scan("A"); assert_equal(160, co.total) co.scan("B"); assert_equal(175, co.total) end end
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