c# calculate ean 13 check digit This break was intended for the if, but broke out of the switch instead. in C#.NET

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7 This break was intended for the if, but broke out of the switch instead.
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Multiple breaks don t necessarily indicate an error, but their existence in a loop is a warning sign, a canary in a coal mine that s not singing as loud as it should be.
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Use continue for tests at the top of a loop A good use of continue is for moving execution past the body of the loop after testing a condition at the top. For example, if the loop reads records, discards records of one kind, and processes records of another kind, you could put a test like this one at the top of the loop:
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Pseudocode Example of a Relatively Safe Use of continue
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while ( not eof( file ) ) do read( record, file ) if ( record.Type <> targetType ) then continue -- process record of targetType
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de Complete
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16. Controlling Loops
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... end while
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Using continue in this way lets you avoid an if test that would effectively indent the entire body of the loop. If, on the other hand, the continue occurs toward the middle or end of the loop, use an if instead.
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Use labeled break if your language supports it Java supports use of labeled breaks to prevent the kind of problem experienced with the New York City telephone outage. A labeled break can be used to exit for a for loop, an if statement, or any block of code enclosed in braces (Arnold, Gosling, and Holmes 2000).
Here s a possible solution to the New York City telephone code problem, with the programming language changed from C++ to Java to show the labeled break:
Java Example of a Better Use of a labeled break Statement Within a doswitch-if Block.
do { ... switch ... CALL_CENTER_DOWN: if () { ... break CALL_CENTER_DOWN; ... } ... } while ( ... );
9 The target of the labeled break is unambiguous.
Use break and continue only with caution Use of break eliminates the possibility of treating a loop as a black box. Limiting yourself to only one statement to control a loop s exit condition is a powerful way to simplify your loops. Using a break forces the person reading your code to look inside the loop for an understanding of the loop control. That makes the loop more difficult to understand.
Use break only after you have considered the alternatives. To paraphrase the nineteenth-century Danish philosopher S ren Kierkegaard, you don t know with certainty whether continue and break are virtuous or evil constructs. Some computer scientists argue that they are a legitimate technique in structured programming; some argue that they are not. Because you don t know in general whether continue and break are right or wrong, use them, but only with a fear
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16. Controlling Loops
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that you might be wrong. It really is a simple proposition: If you can t defend a break or a continue, don t use it.
Checking Endpoints
A single loop usually has three cases of interest: the first case, an arbitrarily selected middle case, and the last case. When you create a loop, mentally run through the first, middle, and last cases to make sure that the loop doesn t have any off-by-one errors. If you have any special cases that are different from the first or last case, check those too. If the loop contains complex computations, get out your calculator and manually check the calculations. Willingness to perform this kind of check is a key difference between efficient and inefficient programmers. Efficient programmers do the work of mental simulations and hand calculations because they know that such measures help them find errors. Inefficient programmers tend to experiment randomly until they find a combination that seems to work. If a loop isn t working the way it s supposed to, the inefficient programmer changes the < sign to a <= sign. If that fails, the inefficient programmer changes the loop index by adding or subtracting 1. Eventually the programmer using this approach might stumble onto the right combination or simply replace the original error with a more subtle one. Even if this random process results in a correct program, it doesn t result in the programmer s knowing why the program is correct. You can expect several benefits from mental simulations and hand calculations. The mental discipline results in fewer errors during initial coding, in more rapid detection of errors during debugging, and in a better overall understanding of the program. The mental exercise means that you understand how your code works rather than guessing about it.
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