我们现在要键入更多的变量并且将它们印出来，这次我们将使用一个叫“格式化字串(format string)”的东西，每一次你使用 " 将一些文字包起来，你就建立一个字串。字串是程式将资讯展示给人的方式。你可以印出他们，可以将它们写入档案，还可以将它们发给网站服务器等等。
字串是很好用的东西，所以在这个练习中你将学会如何创造包含变量内容的字串，使用专门的格式和语法将变量的内容放到字串里，相当于来告诉 Ruby: “Hey 这是一个格式化字串，把这些变量放到那几个位置上”
如常，即使你还不懂这些内容，只要一字不差的键入就可以了。
my_name = 'Zed A. Shaw'
my_age = 35 # not a lie
my_height = 74 # inches
my_weight = 180 # lbs
my_eyes = 'Blue'
my_teeth = 'White'
my_hair = 'Brown'
puts "Let's talk about %s." % my_name
puts "He's %d inches tall." % my_height
puts "He's %d pounds heavy." % my_weight
puts "Actually that's not too heavy."
puts "He's got %s eyes and %s hair." % [my_eyes, my_hair]
puts "His teeth are usually %s depending on the coffee." % my_teeth
# this line is tricky, try to get it exactly right
puts "If I add %d, %d, and %d I get %d." % [
my_age, my_height, my_weight, my_age + my_height + my_weight]$ ruby ex5.rb
Let's talk about Zed A. Shaw.
He's 74 inches tall.
He's 180 pounds heavy.
Actually that's not too heavy.
He's got Blue eyes and Brown hair.
His teeth are usually White depending on the coffee.
If I add 35, 74, and 180 I get 289.
$my_ 去掉，确认将每一个地方的都改掉，不只是你使用 = 赋值过的地方。