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+### 二  把程序划分成多个文件
+
+#### 程序：文本格式化
+
+输入未格式化的引语：来自 Dennis M. Ritchie 写的"The Development of the C programming language" 一文：
+
+```c
+  C 	is quirky,  flawed,		and an
+enormous success.		Although accidents of	  history
+   surely helped,	it evidently	satisfied  a    need
+       
+       for a system implementation	language		efficient
+ enough		to  displace		assembly  language,
+yet sufficiently	abstract	and fluent	 to describe
+  algorithms  and		interactions   in  a   wide variety 
+of	  environments.
+    				--		Dennis		M.		Ritchie
+```
+
+程序完成对这段文字的调整：
+
+```c
+C is quirky, flawed,  and  an  enormous  success.  Although
+accidents of history surely helped, it evidently satisfied a
+need for a system implementation language efficient  enough
+to displace assembly language, yet sufficiently abstract and
+fluent to describe algorithms and interactions  in  a  wide
+variety of environments. -- Dennis M. Ritchie
+```
+
+程序分析：
+
+完成这个程序需要两步：读入和输出。
+
+读入我们选择按单词读入到当前行中，然后按当前行输出。注意输出的每一行最后“对”的很齐，我们 write_line 函数对这种格式做了特殊处理。
+
+按单词读入我们创建 word.h 和 word.c
+
+按行输出我们创建 line.h 和 line.c
+
+最后用 justify.c 包含 main 函数
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