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C++ Example of Housekeeping Statements at the End of a Loop
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stringIndex = 1; totalLength = 0; while ( !inputFile.EndOfFile() ) { // do the work of the loop inputFile >> inputString; strList[ stringIndex ] = inputString; ... // prepare for next pass through the loop--housekeeping
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stringIndex++; totalLength = totalLength + inputString.length(); }
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6 Here are the housekeeping statements.
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As a general rule, the variables you initialize before the loop are the variables you ll manipulate in the housekeeping part of the loop.
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Make each loop perform only one function The mere fact that a loop can be used to do two things at once isn t sufficient justification for doing them together. Loops should be like routines in that each one should do only one thing and do it well. If it seems inefficient to use two loops where one would suffice, write the code as two loops, comment that they could be combined for efficiency, and then wait until benchmarks show that the section of the program poses a performance problem before changing the two loops into one.
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16. Controlling Loops
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Page 12
Exiting the Loop
Here are several guidelines for handling the end of a loop:
Assure yourself that the loop ends This is fundamental. Mentally simulate the execution of the loop until you are confident that, in all circumstances, it ends. Think through the nominal cases, the endpoints, and each of the exceptional cases. Make loop-termination conditions obvious If you use a for loop and don t fool around with the loop index and don t use a goto or break to get out of the loop, the termination condition will be obvious. Likewise, if you use a while or repeat-until loop and put all the control in the while or repeat-until clause, the termination condition will be obvious. The key is putting the control in one place. Don t monkey with the loop index of a for loop to make the loop terminate Some programmers jimmy the value of a for loop index to make the loop terminate early. Here s an example:
CODING HORROR
Java Example of Monkeying with a Loop Index
for ( int i = 0; i < 100; i++ ) { // some code ... if ( ... ) { i = 100; } // more code ... }
9 Here s the monkeying.
The intent in this example is to terminate the loop under some condition by setting i to 100, a value that s larger than the end of the for loop s range of 0 through 99. Virtually all good programmers avoid this practice; it s the sign of an amateur. When you set up a for loop, the loop counter is off limits. Use a while loop to provide more control over the loop s exit conditions.
Avoid code that depends on the loop index s final value It s bad form to use the value of the loop index after the loop. The terminal value of the loop index varies from language to language and implementation to implementation. The value is different when the loop terminates normally and when it terminates abnormally. Even if you happen to know what the final value is without stopping to think about it, the next person to read the code will probably have to think about it. It s better form and more self-documenting if you assign the final value to a variable at the appropriate point inside the loop.
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16. Controlling Loops
Page 13
Here s an example of code that misuses the index s final value:
C++ Example of Code That Misuses a Loop Index s Terminal Value
for ( recordCount = 0; recordCount < MAX_RECORDS; recordCount++ ) { if ( entry[ recordCount ] == testValue ) { break; } } // lots of code ... if ( recordCount < MAX_RECORDS ) { return( true ); } else { return( false ); }
7 Here s the misuse of the loop index s terminal value.
In this fragment, the second test for recordCount < MaxRecords makes it appear that the loop is supposed to loop though all the values in entry[] and return true if it finds the one equal to TestValue, false otherwise. It s hard to remember whether the index gets incremented past the end of the loop, so it s easy to make an off-by-one error. You re better off writing code that doesn t depend on the index s final value. Here s how to rewrite the code:
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