7. 输入和输出 Input and Output

There are several ways to present the output of a program; data can be printed in a human-readable form, or written to a file for future use. This chapter will discuss some of the possibilities.

有几种方法可以表现程序的输出结果；数据可以用可读的结构打印，也可以写入文件供以后使用。本章将会讨论几种可行的做法。