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C++ Example of Code That Doesn t Misuse a Loop Index s Terminal Value
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found = false; for ( recordCount = 0; recordCount < MAX_RECORDS; recordCount++ ) { if ( entry[ recordCount ] == testValue ) { found = true; break; } } // lots of code ... return( found );
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This second code fragment uses an extra variable, and keeps references to recordCount more localized. As is often the case when an extra boolean variable is used, the resulting code is clearer.
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Consider using safety counters If you have a program in which an error would be catastrophic, you can use safety counters to ensure that all loops end. Here s a C++ loop that could profitably use a safety counter:
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16. Controlling Loops
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C++ Example of a Loop That Could Use a Safety Counter
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do { node = node->Next; ... } while ( node->Next != NULL );
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Here s the same code with the safety counters added:
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C++ Example of Using a Safety Counter
safetyCounter = 0; do { node = node->Next; ... safetyCounter++; if ( safetyCounter >= SAFETY_LIMIT ) { Assert( false, "Internal Error: Safety-Counter Violation." ); } ... } while ( node->Next != NULL );
9 Here s the safety-counter code.
Safety counters are not a cure all. Introduced into the code one at a time, safety counters might lead to additional errors. If they aren t used in every loop, you could forget to maintain safety-counter code when you modify loops in parts of the program that do use them. If safety counters are instituted as a project-wide standard, however, you learn to expect them, and safety-counter code is no more prone to produce errors later than any other code is.
Exiting Loops Early
Many languages provide a means of causing a loop to terminate in some way other than completing the for or while condition. In this discussion, break is a generic term for break in C++, C, and Java, Exit-Do and Exit-For in Visual Basic, and similar constructs, including those simulated with gotos in languages that don t support break directly. The break statement (or equivalent) causes a loop to terminate through the normal exit channel; the program resumes execution at the first statement following the loop. The continue statement is similar to break in that it s an auxiliary loop-control statement. Rather than causing a loop exit, however, continue causes the program to skip the loop body and continue executing at the beginning of the next iteration of the loop. A continue statement is shorthand for an if-then clause that would prevent the rest of the loop from being executed.
Consider using break statements rather than boolean flags in a while loop In some cases, adding boolean flags to a while loop to emulate exits from the body of the loop makes the loop hard to read. Sometimes you can remove several levels of indentation inside a loop and simplify loop control just by using
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16. Controlling Loops
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a break instead of a series of if tests. Putting multiple break conditions into separate statements and placing them near the code that produces the break can reduce nesting and make the loop more readable.
Be wary of a loop with a lot of breaks scattered through it A loop s containing a lot of breaks can indicate unclear thinking about the structure of the loop or its role in the surrounding code. A proliferation of breaks raises the possibility that the loop could be more clearly expressed as a series of loops rather than as one loop with many exits.
According to an article in Software Engineering Notes, the software error that brought down the New York City phone systems for 9 hours on January 15, 1990 was due to an extra break statement (SEN 1990):
C++ Example of Erroneous Use of a break Statement Within a doswitch-if Block.
do { ... switch ... if () { ... break; ... } ... } while ( ... );
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