ruby script lesson-1

main.rb

class Student
  attr_reader :id, :name, :age

  def initialize(id, name, age)
    @id = id
    @name = name
    @age = age
  end

  def id
    @id

  end

  def name
    @name

  end

  def age
    @age
  end

  def to_s
    "this is No. #{id}:#{name} and age is:#{age}"
  end

end

require 'csv'
class CSV_reader
  def initialize
    @stu = []
  end

  def read_all(filename)
    #CSV.read(filename)
    CSV.foreach(filename, headers: true) do |row|
      @stu << Student.new(row['id'], row['name'], row['age'])
    end
  end

  def get_sum
    sum = 0
    @stu.each { |stu| sum+=1 }
    sum
  end

  def stu
    @stu
  end
end
#
#s = Student.new(1, 'xiang', 22)
#p s


reader = CSV_reader.new

ARGV.each do |file|
  #STDOUT.puts "start reading #{file}...."
  STDERR.puts "start reading #{file}...."
  reader.read_all(file)

end
#reader.read_all('student.csv')

p reader.get_sum
p reader.stu