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Debugging Theory in General Everyone has a different approach to programming and debugging However, certain techniques have, over time, proven to be better than others In the case of debugging, incremental testing is considered to be the most cost- and time-effective method, even though it can appear to slow the development process at first Incremental testing is the process of always having a working program That is, very early in the development process, an operational unit is established An operational unit is simply a piece of working code As new code is added to this unit, it is tested and debugged In this way, the programmer can easily find errors because the errors probably occur in the newly added code or in the way that it interacts with the operational unit Debugging time is proportional to the total number of lines of code in which a bug could reside With incremental testing, you can often restrict the number of lines of code that may contain a bug to only those that are newly added that is, those not part of the operational unit This situation is shown in Figure 28-2 As a programmer, you want to deal with the smallest possible area while debugging Through incremental testing, you can subtract the area already tested from the total area, thereby reducing the region in which a bug is most likely to occur In large projects, there are often several modules that have little interaction In these cases, you can establish several operational units to allow concurrent development Incremental testing is simply the process of always having working code As soon as it is possible to run a piece of your program, you should do so, testing that section completely As you add to the program, continue to test the new sections as well as the way they connect to the known operational code In this way, you concentrate most bugs in a small area of code Of course, you must always be alert to the possibility that a bug may have been overlooked in the operational unit, but you have reduced the likelihood of this being the case
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Figure 28-2 The most likely location of a bug when incremental testing is used
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PART VI A C INTERPRETER
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Part Six concludes this book by developing an interpreter for C This accomplishes two important things First, it illustrates several aspects of C programming that are common to most larger projects Second, it gives insight into the nature and design of the C language
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29 A C Interpreter
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Page 714
Language interpreters are fun! And what could be more fun for a C programmer than a C interpreter To end this book I wanted a topic that would be of interest to virtually all C programmers and, at the same time, illustrate several features of the C language I also wanted the topic to be fresh, exciting, and useful After rejecting many ideas, I finally decided upon the creation of the Little C interpreter Here's why As valuable and important as compilers are, the creation of a compiler can be a difficult and lengthy process In fact, just the creation of a compiler's run-time library is a large job in itself By contrast, the creation of a language interpreter is an easier, more manageable task Also, if it is correctly designed, the operation of an interpreter can be easier to understand than that of a comparable compiler Beyond ease of development, language interpreters offer an interesting feature not found in compilers an engine that actually executes the program Remember, a compiler only translates your program's source code into a form that the computer can execute An interpreter actually executes the program It is this distinction that makes interpreters interesting If you are like most C programmers, you use C not only for its power and flexibility but also because the language itself represents an almost intangible, formal beauty that can be appreciated for its own sake In fact, C is often referred to as ''elegant" because of its consistency and purity Much has been written about the C language from the "outside looking in," but seldom has it been explored from the "inside" Therefore, what better way to end this book than to create a C program that interprets a subset of the C language In the course of this chapter an interpreter is developed that can execute a subset of the C language Not only is the interpreter functional, but it is also designed so that you can easily enhance it, extend it, and even add features not found in C If you haven't thought about how C really works, you will be pleasantly surprised to see how straightforward it is The C language is one of the most theoretically consistent computer languages ever developed By the time you finish this chapter, you will not only have a C interpreter that you can use and enlarge, but you will also have gained considerable insight into the structure of the C language itself Of course, if you're like me, you'll find the C interpreter presented here just plain fun to play with!
NOTE The source code to the C interpreter presented in this chapter is fairly long, but don't be intimidated by it If you read through the discussion, you will have no trouble understanding it and following its execution
The Practical Importance of Interpreters Although the Little C interpreter is interesting in and of itself, language interpreters do have some practical importance in computing
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