Classes, Objects, and Variables(Chapter 3 of Programming Ruby)

最新推荐文章于 2025-08-16 11:46:42 发布

转载最新推荐文章于 2025-08-16 11:46:42 发布 · 118 阅读

0 ·

CC 4.0 BY-SA版权

原文链接：http://www.cnblogs.com/zhtf2014/archive/2010/06/27/1766219.html

文章标签：

#ruby

本文介绍了一个用Ruby实现的图书库存管理系统，包括定义BookInStock类，读取CSV文件中的图书数据，以及计算库存总价值的功能。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

class

1 class BookInStock
2   attr_reader :isbn
3   attr_accessor :price
4   def initialize(isbn, price)
5     @isbn = isbn
6     @price = Float(price)
7   end
8
9   def to_s()
10     "ISBN: #{@isbn}, Price: #{@price}"
11   end
12 end
13
14 b1 = BookInStock.new("aa", 3)
15 p b1
16 b2 = BookInStock.new("bb", 2.3)
17 p b2
18 b3 = BookInStock.new("cc", "5.67")
19 puts b3
20 puts "ISBN: #{b1.isbn}"

book_in_stock.rb

1 class BookInStock
2   attr_reader :isbn, :price
3   def initialize(isbn, price)
4     @isbn = isbn
5     @price = Float(price)
6   end
7 end

csv_reader.rb

1 require 'csv'
2 require_relative 'book_in_stock'
3 class CsvReader
4   def initialize
5     @books_in_stock = []
6   end
7   def read_in_csv_data(csv_file_name)
8     CSV.foreach(csv_file_name, headers: true) do |row|
9       @books_in_stock << BookInStock.new(row["ISBN"], row["Amount"])
10     end
11   end
12   def total_value_in_stock
13     sum = 0.0
14     @books_in_stock.each {|book| sum += book.price}
15     sum
16   end
17   def number_of_each_isbn
18     # ...
19   end
20 end

stock_stats.rb

require_relative 'csv_reader'
reader = CsvReader.new
ARGV.each do |csv_file_name|
STDERR.puts "Processing #{csv_file_name}"
reader.read_in_csv_data(csv_file_name)
end
puts "Total value = #{reader.total_value_in_stock}"

1 ruby stock_stats.rb test.csv
2
3 Processing test.csv
4 Total value = 122.07

转载于:https://www.cnblogs.com/zhtf2014/archive/2010/06/27/1766219.html