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#Ò»¡¢¶¨ÒåÒ»¸öÀà
class Person
  def initialize(name,age=18)
    @name=name;
    @age=age;
    @motherland="china";
  end
  def talk
    puts "my name is "+@name+" and I am "+@age.to_s
    if @motherland == "china"
      puts "I am a Chinese."
    else
      puts "I am a foreigner."
    end
  end#talk½áÊø
  attr_writer:motherland 
  attr_writer:age
end#class½áÊø
p1=Person.new("Zhangren",10);
p1.talk;
p1.motherland="abc";
p1.talk;
p1.age=20;
p1.talk;
#¶þ¡¢¼Ì³Ð×ÔÒ»¸öÀà
class Student < Person
  def talk
    #super;#Õâ»áµ÷Óø¸ÀàtalkÖеĴúÂë
    puts "I am a student. my name is "+@name+", age is "+@age.to_s
  end # talk·½·¨½áÊø
end # StudentÀà½áÊø
p3=Student.new("kaichuan",25); p3.talk
p4=Student.new("Ben"); p4.talk
#RubyûÓÐÖØÔØ·½·¨£¬ÒòΪ²ÎÊýûÓÐÀàÐÍ£¬ËùÒÔû·¨ÖØÔØ¡£Óжà̬£¬²»¹ý²»Ì«Ã÷ÏÔ£¬ÒòΪ±äÁ¿¶¼Ã»ÓÐÀàÐÍ£¬ËùÒÔ̸²»Éϸ¸ÀàÒýÓÃÖ¸Ïò×ÓÀà¶ÔÏ󣬶¼ÊÇͳһµÄÒýÓá£
#Èý¡¢±äÁ¿¶¯Ì¬ÐÔ
# E5.3-1.rb
a=5
b="hh"
puts "a = #{a} #{b} #{a}"
puts "b = #{b}"
#ËÄ¡¢ÖØд
def talk (a,b=1)
puts "This is talk version 2."
end
def talk (a)
puts "This is talk version 1."
end
talk (2) # This is talk version 1.
#talk (2,7) # ±¨´í£¬ÒòΪÖØд֮ºó£¬Ö»ÓкóÒ»¸öÓÐÓã¬Ã»ÓÐÖØÔØ¡£¸¸×ÓÀàÖÐÒ²ÊÇÖØд¡£
#Îå¡¢RubyµÄ±äÁ¿µÈ±êʶÃû³ÆÇø·Ö̫Сд¡£È«¾Ö±äÁ¿ÓÃ$ÒýÓã¬ÊµÀý±äÁ¿ÓÃ@£¨Ò²¾ÍÊdzÉÔ±±äÁ¿£¬ÒòΪ²»ÐèÒªÉùÃ÷£¬¶¼ÊÇÖ±½ÓÓã©£¬Àà±äÁ¿ÓÃ@@£¨Æäʵ¾ÍÏ൱ÓÚ¾²Ì¬±äÁ¿£©
$a="\n a is a global value"
puts $a
class StudentClass
  @@count=0
  def initialize( name )
    @name = name
    @@count+=1
  end
  def talk
    puts "I am #@name, This class have #@@count students."
  end
end
p1=StudentClass.new("Student 1 ")
p2=StudentClass.new