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17. Unusual Control Structures
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The evidence suggests only that deliberately chaotic control structure degrades [programmer] performance. These experiments provide virtually no evidence for the beneficial effect of any specific method of structuring control flow. B. A. Sheil
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Decades worth of research with gotos failed to demonstrate their harmfulness. In a survey of the literature, B. A. Sheil concluded that unrealistic test conditions, poor data analysis, and inconclusive results failed to support the claim of Shneiderman and others that the number of bugs in code was proportional to the number of gotos (1981). Sheil didn t go so far as to conclude that using gotos is a good idea rather that experimental evidence against them was not conclusive. Finally, the goto has been incorporated into many modern languages including Visual Basic, C++ and the Ada language the most carefully engineered programming language in history. Ada was developed long after the arguments on both sides of the goto debate had been fully developed, and after considering all sides of the issue, Ada s engineers decided to include the goto.
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The Phony goto Debate
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A primary feature of most goto discussions is a shallow approach to the question. The arguer on the gotos are evil side presents a trivial code fragment that uses gotos and then shows how easy it is to rewrite the fragment without gotos. This proves mainly that it s easy to write trivial code without gotos. The arguer on the I can t live without gotos side usually presents a case in which eliminating a goto results in an extra comparison or the duplication of a line of code. This proves mainly that there s a case in which using a goto results in one less comparison not a significant gain on today s computers. Most textbooks don t help. They provide a trivial example of rewriting some code without a goto as if that covered the subject. Here s a disguised example of a trivial piece of code from such a textbook:
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C++ Example of Code That s Supposed to Be Easy to Rewrite Without gotos
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do { GetData( inputFile, data ); if ( eof( inputFile ) ) { goto LOOP_EXIT; } DoSomething( data ); } while ( data != -1 ); LOOP_EXIT:
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The book quickly replaces this code with gotoless code:
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C++ Example of Supposedly Equivalent Code, Rewritten Without gotos
GetData( inputFile, data );
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17. Unusual Control Structures
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while ( ( !eof( inputFile ) ) && ( ( data != -1 ) ) ) do { DoSomething( data ); GetData( inputFile, data ) }
This so-called trivial example contains an error. In the case in which data equals -1 entering the loop, the translated code detects the -1 and exits the loop before executing DoSomething(). The original code executes DoSomething() before the -1 is detected. The programming book trying to show how easy it is to code without gotos translated its own example incorrectly. But the author of that book shouldn t feel too bad; other books make similar mistakes. Even the pros have difficulty achieving gotoless nirvana. Here s a faithful translation of the code with no gotos:
C++ Example of Truly Equivalent Code, Rewritten Without gotos
do { GetData( inputFile, data ); if ( !eof( inputFile )) { DoSomething( data ); } } while ( ( data != -1 ) && ( !eof( InputFile ) ) );
Even with a correct translation of the code, the example is still phony because it shows a trivial use of the goto. Such cases are not the ones for which thoughtful programmers choose a goto as their preferred form of control. It would be hard at this late date to add anything worthwhile to the theoretical goto debate. What s not usually addressed, however, is the situation in which a programmer fully aware of the gotoless alternatives chooses to use a goto to enhance readability and maintainability. The following sections present cases in which some experienced programmers have argued for using gotos. The discussions provide examples of code with gotos and code rewritten without gotos and evaluate the trade-offs between the versions.
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