我正在 Windows 7 上学习 Ruby（使用 1.8.6 版）。
当我尝试运行下面的stock_stats.rb程序时，我收到以下错误：
C:\Users\Will\Desktop\ruby>ruby stock_stats.rb
stock_stats.rb:1: undefined method `require_relative' for main:Object (NoMethodE
rror)
我有三个 v.small 代码文件：
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}"
csv_reader.rb
require 'csv'
require_relative 'book_in_stock'
class CsvReader
def initialize
@books_in_stock = []
end
def read_in_csv_data(csv_file_name)
CSV.foreach(csv_file_name, headers: true) do |row|
@books_in_stock << BookInStock.new(row["ISBN"], row["Amount"])
end
end
# later we'll see how to use inject to sum a collection
def total_value_in_stock
sum = 0.0
@books_in_stock.each {|book| sum += book.price}
sum
end
def number_of_each_isbn
# ...
end
end
book_in_stock.rb
require 'csv'
require_relative 'book_in_stock'
class CsvReader
def initialize
@books_in_stock = []
end
def read_in_csv_data(csv_file_name)
CSV.foreach(csv_file_name, headers: true) do |row|
@books_in_stock << BookInStock.new(row["ISBN"], row["Amount"])
end
end
# later we'll see how to use inject to sum a collection
def total_value_in_stock
sum = 0.0
@books_in_stock.each {|book| sum += book.price}
sum
end
def number_of_each_isbn
# ...
end
end
提前感谢您的帮助。