练习5：更多的变量和打印–笨方法学ruby在线-昊天SEO

我们现在要键入更多的变量并且将它们打印出来，这次我们将使用一个叫「格式化字符串(format string)」的东西，每一次你使用 " 将一些文字包起来，你就建立一个字符串。字符串是程序将信息展示给人的方式。你可以打印他们，可以将它们写入文档，还可以将它们发给网站服务器等等。
字符串是很好用的东西，所以在这个练习中你将学会如何创造包含变量内容的字符串，使用专门的格式和语法将变量的内容放到字符串里，相当于来告诉 Ruby: “Hey 这是一个格式化字符串，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。

<span class="nv">my_name</span> <span class="o">=</span> <span class="s1">'Zed A. Shaw'</span>
<span class="nv">my_age</span> <span class="o">=</span> <span class="m">35</span> <span class="c"># not a lie</span>
<span class="nv">my_height</span> <span class="o">=</span> <span class="m">74</span> <span class="c"># inches</span>
<span class="nv">my_weight</span> <span class="o">=</span> <span class="m">180</span> <span class="c"># lbs</span>
<span class="nv">my_eyes</span> <span class="o">=</span> <span class="s1">'Blue'</span>
<span class="nv">my_teeth</span> <span class="o">=</span> <span class="s1">'White'</span>
<span class="nv">my_hair</span> <span class="o">=</span> <span class="s1">'Brown'</span>

puts <span class="s2">"Let's talk about %s."</span> % my_name
puts <span class="s2">"He's %d inches tall."</span> % my_height
puts <span class="s2">"He's %d pounds heavy."</span> % my_weight
puts <span class="s2">"Actually that's not too heavy."</span>
puts <span class="s2">"He's got %s eyes and %s hair."</span> % <span class="o">[</span>my_eyes, my_hair<span class="o">]</span>
puts <span class="s2">"His teeth are usually %s depending on the coffee."</span> % my_teeth

<span class="c"># this line is tricky, try to get it exactly right</span>
puts <span class="s2">"If I add %d, %d, and %d I get %d."</span> % <span class="o">[</span>
    my_age, my_height, my_weight, my_age + my_height + my_weight<span class="o">]</span>