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For simple if-elses, pay attention to the order of the if and else clauses, especially if they process a lot of errors. Make sure the nominal case is clear. For if-then-else chains and case statements, choose an order that maximizes readability. Use the default clause in a case statement or the last else in a chain of ifthen-elses to trap errors. All control constructs are not created equal. Choose the control construct that s most appropriate for each section of code.
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16. Controlling Loops
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Controlling Loops
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Contents 16.1 Selecting the Kind of Loop
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16.2 Controlling the Loop 16.3 Creating Loops Easily from the Inside Out 16.4 Correspondence Between Loops and Arrays
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Related Topics Taming Deep Nesting: Section 19.4
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General control issues: 19 Code with conditionals: 15 Straight-line code: 14 Relationship between control structures and data types: Section 10.7 LOOP IS AN INFORMAL TERM that refers to any kind of iterative control structure any structure that causes a program to repeatedly execute a block of code. Common loop types are for, while, and do-while in C++ and Java and For-Next, While-Wend, and Do-Loop-While in Visual Basic. Using loops is one of the most complex aspects of programming; knowing how and when to use each kind of loop is a decisive factor in constructing high-quality software.
16.1 Selecting the Kind of Loop
In most languages, you ll use a few kinds of loops. The counted loop is performed a specific number of times, perhaps one time for each employee. The continuously evaluated loop doesn t know ahead of time how many times it will be executed and tests whether it has finished on each iteration. For example, it runs while money remains, until the user selects quit, or until it encounters an error.
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16. Controlling Loops
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The endless loop executes forever once it has started. It s the kind you find in embedded systems such as pacemakers, microwave ovens, and cruise controls. The iterator loop that performs its action once for each element in a container class
The kinds of loops are differentiated first by flexibility whether the loop executes a specified number of times or whether it tests for completion on each iteration. The kinds of loops are also differentiated by the location of the test for completion. You can put the test at the beginning, the middle, or the end of the loop. This characteristic tells you whether the loop executes at least once. If the loop is tested at the beginning, its body isn t necessarily executed. If the loop is tested at the end, its body is executed at least once. If the loop is tested in the middle, the part of the loop that precedes the test is executed at least once, but the part of the loop that follows the test isn t necessarily executed at all. Flexibility and the location of the test determine the kind of loop to choose as a control structure. Table 16-1 shows the kinds of loops in several languages and describes each loop s flexibility and test location.
Table 16-1. The Kinds of Loops Language Visual Basic Kind of Loop For-Next While-Wend Do-Loop-While For-Each C, C++, C#, Java for while do-while foreach* Flexibility rigid flexible flexible rigid flexible flexible flexible rigid Test Location beginning beginning beginning or end beginning beginning beginning end beginning
* Available only in C# at the time of this writing.
When to Use a while Loop
Novice programmers sometimes think that a while loop is continuously evaluated and that it terminates the instant the while condition becomes false, regardless of which statement in the loop is being executed (Curtis et al. 1986). Although it s not quite that flexible, a while loop is a flexible loop choice. If you don t know ahead of time exactly how many times you ll want the loop to iterate, use a while loop. Contrary to what some novices think, the test for the loop exit is performed only once each time through the loop, and the main issue
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