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In our own work, we routinely use all three of these languages, and many others The choice of language depends on the problem: operating systems are best written in an efficient and unrestrictive language like C or C u ; quick prototypes are often easiest in a command interpreter or a scripting language like Awk or Perl; for user interfaces Visual Basic and Tcmk are strong contenders, along with Java There is an important pedagogical issue in choosing a language for our examples Just as no language solves all problems equally well, no single language is best for presenting all topics Higher-level languages preempt some design decisions If we use a lower-level language, we get to consider alternative answers to the questions; by exposing more of the details, we can talk about them better Experience shows that even when we use the facilities of high-level languages, it's invaluable to know how they relate to lower-level issues; without that insight, it's easy to run into performance problems and mysterious behavior So we will often use C for our examples, even though in practice we might choose something else For the most part, however, the lessons are independent of any particular programming language The choice of data structure is affected by the language at hand; there may be few options in some languages while others might support a variety of alternatives But the way to approach making the choice will be the same The details of how to test and debug are different in different languages, but strategies and tactics are similar in all Most of the techniques for making a program efficient can be applied in any language Whatever language you write in, your task as a programmer is to do the best you can with the tools at hand A good programmer can overcome a poor language or a clumsy operating system, but even a great programming environment will not rescue a bad programmer We hope that, no matter what your current experience and skill this book will help you to program better and enjoy it more We are deeply grateful to friends and colleagues who read drafts of the manuscript and gave us many helpful comments Jon Bentley Russ Cox John Lakos John Linderman, Peter Memishian, lan Lance Taylor, Howard Trickey, and Chris Van Wyk read the manuscript, some more than once, with exceptional care and thoroughness We are indebted to Tom Cargill, Chris Cleeland, Steve Dewhurst, Eric Grosse, Andrew Herron Gerard Holzmann, Doug McIlroy Paul McNamee, Peter Nelson, Dennis Ritchie, Rich Stevens, Tom Szymanski, Kentaro Toyama, John Wait, Daniel C Wang, Peter Weinberger Margaret Wright and Cliff Young for invaluable comments on drafts at various stages We also appreciate good advice and thoughtful suggestions from A1 Aho, Ken Arnold, Chuck Bigelow, Joshua Bloch Bill Coughran Bob Flandrena, Renee French, Mark Kernighan Andy Koenig, Sape Mullender Evi Nemeth, Many Rabinowitz, Mark V Shaney, Bjarne Stroustrup, Ken Thompson, and Phil Wadler Thank you all
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It is an old observation that the best writers sometimes disregard the rules of rhetoric When they do so, however, the reader will usually find in the sentence some compensating merit, attained at the cost of the violation Unless he is certain of doing as well, he will probably do best to follow the rules
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William Strunk and E B White, The Elements of Sryle This fragment of code comes from a large program written many years ago: i f ( (country == SING) I I (country == BRNI) I I (country == POL) I I (country == ITALY) ) C
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/* * I f t h e country i s Singapore, Brunei o r Poland * then t h e current time i s t h e answer time * rather than t h e o f f hook time * Reset answer time and s e t day of week */
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It's carefully written formatted, and commented, and the program it comes from works extremely well; the programmers who created this system are rightly proud of what they built But this excerpt is puzzling to the casual reader What relationship links Singapore, Brunei, Poland and Italy Why isn't Italy mentioned in the comment Since the comment and the code differ, one of them must be wrong Maybe both are The code is what gets executed and tested, so it's more likely to be right; probably the comment didn't get updated when the code did The comment doesn't say enough about the relationship among the three countries it does mention; if you had to maintain this code, you would need to know more The few lines above are typical of much real code: mostly well done, but with some things that could be improved
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