习题 8: 印出，印出

formatter = "%s %s %s %s"
puts formatter % [1, 2, 3, 4]
puts formatter % ["one", "two", "three", "four"]
puts formatter % [true, false, false, true]
puts formatter % [formatter, formatter, formatter, formatter]
puts formatter % [
    "I had this thing.",
    "That you could type up right.",
    "But it didn't sing.",
    "So I said goodnight."
]

你应该看到的结果

$ ruby ex8.rb
1 2 3 4
one two three four
true false false true
%s %s %s %s %s %s %s %s %s %s %s %s %s %s %s %s
I had this thing. That you could type up right. But it didn't sing. So I said goodnight.
$

加分习题

1. 自己检查结果，记录你犯过的错误，并且在下个练习中尽量不犯相同的错误。

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