摘要：
8. Errors and Exceptions Until now error messages haven’t been more than mentioned, but if you have tried out the examples you have probably seen some. There are (at least) two distinguishable kinds ... 阅读全文
摘要：
7. 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... 阅读全文