c# barcode maker C++ Examples of Rewriting Code to be Clearer with a non-Null Loop Body in Visual C#.NET

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RecordType record = recordArray.Read( index ); index++; while ( record != recordArray.EmptyRecord() ) { record = recordArray.Read( index ); index++ };
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This approach introduces an additional loop-control variable and requires more lines of code, but it emphasizes straightforward programming practice rather than clever use of side effects, which is preferable in production code.
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19.4 Taming Dangerously Deep Nesting
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Excessive indentation, or nesting, has been pilloried in computing literature for 25 years and is still one of the chief culprits in confusing code. Studies by Noam Chomsky and Gerald Weinberg suggest that few people can understand more than three levels of nested ifs (Yourdon 1986a), and many researchers recommend avoiding nesting to more than three or four levels (Myers 1976, Marca 1981, and Ledgard and Tauer 1987a). Deep nesting works against what 5 describes as Software s Major Technical Imperative: Managing Complexity. That is reason enough to avoid deep nesting. It s not hard to avoid deep nesting. If you have deep nesting, you can redesign the tests performed in the if and else clauses or you can break code into simpler routines. The following sections present several ways to reduce the nesting depth.
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6 sting part of the condition to
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reduce complexity is similar to retesting a status variable. 8 That technique is demonstrated in Error CODING HORROR 9 Processing and gotos in 0 Section 17.3.
Simplify a nested if by retesting part of the condition If the nesting gets too deep, you can decrease the number of nesting levels by retesting some of the conditions. Here s a code example with nesting that s deep enough to warrant restructuring:
C++ Example of Badly, Deeply, Nested Code
if ( inputStatus == InputStatus_Success ) { // lots of code ... if ( printerRoutine != NULL ) {
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// lots of code ... if ( SetupPage() ) { // lots of code ... if ( AllocMem( &printData ) ) { // lots of code ... } } } }
This example is contrived to show nesting levels. The // lots of code parts are intended to suggest that the routine has enough code to stretch across several screens or across the page boundary of a printed code listing. Here s the code revised to use retesting rather than nesting:
C++ Example of Code Mercifully Unnested by Retesting
if ( inputStatus == InputStatus_Success ) { // lots of code ... if ( printerRoutine != NULL ) { // lots of code ... } } if ( ( inputStatus == InputStatus_Success ) && ( printerRoutine != NULL ) && SetupPage() ) { // lots of code ... if ( AllocMem( &printData ) ) { // lots of code ... } }
This is a particularly realistic example because it shows that you can t reduce the nesting level for free; you have to put up with a more complicated test in return for the reduced level of nesting. A reduction from four levels to two is a big improvement in readability, however, and is worth considering.
Simplify a nested if by using a break block An alternative to the approach described above is to define a section of code that will be executed as a block. If some condition in the middle of the block fails, execution continues at the end of the block.
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C++ Example of Using a break Block
do { // begin break block if ( inputStatus != InputStatus_Success ) { break; // break out of block } // lots of code ... if ( printerRoutine == NULL ) { break; // break out of block } // lots of code ... if ( !SetupPage() ) { break; // break out of block } // lots of code ... if ( !AllocMem( &printData ) ) { break; // break out of block } // lots of code ... } while (FALSE); // end break block
This technique is uncommon enough that it should be used only when your entire team is familiar with it and when it has been adopted by the team as an accepted coding practice.
Convert a nested if to a set of if-then-elses If you think about a nested if test critically, you might discover that you can reorganize it so that it uses if-then-elses rather than nested ifs. Suppose you have a bushy decision tree like this:
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