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Indentation Use indentation to show the logical structure of a program. As a rule, you should indent statements under the statement to which they are logically subordinate.
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Indentation has been shown to be correlated with increased programmer comprehension. The article Program Indentation and Comprehensibility reported that several studies found correlations between indentation and improved comprehension (Miaria et al. 1983). Subjects scored 20 to 30 percent higher on a test of comprehension when programs had a two-to-four-spaces indentation scheme than they did when programs had no indentation at all.
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31. Layout and Style
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The same study found that it was important to neither under-emphasize nor overemphasize a program s logical structure. The lowest comprehension scores were achieved on programs that were not indented at all. The second lowest were achieved on programs that used six-space indentation. The study concluded that two-to-four-space indentation was optimal. Interestingly, many subjects in the experiment felt that the six-space indentation was easier to use than the smaller indentations, even though their scores were lower. That s probably because sixspace indentation looks pleasing. But regardless of how pretty it looks, six-space indentation turns out to be less readable. This is an example of a collision between aesthetic appeal and readability.
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Use more parentheses than you think you need. Use parentheses to clarify expressions that involve more than two terms. They may not be needed, but they add clarity and they don t cost you anything. For example, how are the following expressions evaluated C++ Version: Visual Basic Version:
12 + 4 % 3 * 7 / 8 12 + 4 mod 3 * 7 \ 8
The key question is, did you have to think about how the expressions are evaluated Can you be confident in your answer without checking some references Even experienced programmers don t answer confidently, and that s why you should use parentheses whenever there is any doubt about how an expression is evaluated.
31.3 Layout Styles
Most layout issues have to do with laying out blocks, the groups of statements below control statements. A block is enclosed between braces or keywords: { and } in C++ and Java; if-then-endif in Visual Basic; and other similar structures in other languages. For simplicity, much of this discussion uses begin and end generically, assuming that you can figure out how the discussion applies to braces in C++ and Java or other blocking mechanisms in other languages. The following sections describe four general styles of layout: Pure blocks Emulating pure blocks using begin-end pairs (braces) to designate block boundaries Endline layout
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Pure Blocks
Much of the layout controversy stems from the inherent awkwardness of the more popular programming languages. A well-designed language has clear block structures that lend themselves to a natural indentation style. In Visual Basic, for example, each control construct has its own terminator, and you can t use a control construct without using the terminator. Code is blocked naturally. Some examples in Visual Basic are shown in Listing 31-6, Listing 31-7, and Listing 31-8:
Listing 31-6. Visual Basic example of a pure if block.
If pixelColor = Color_Red Then statement1 statement2 ... End If
Listing 31-7. Visual Basic example of a pure while block.
While pixelColor = Color_Red statement1 statement2 ... Wend
Listing 31-8. Visual Basic example of a pure case block.
Select Case pixelColor Case Color_Red statement1 statement2 ... Case Color_Green statement1 statement2 ... Case Else statement1 statement2 ... End Select
A control construct in Visual Basic always has a beginning statement If-Then, While, and Select-Case in the examples and it always has a corresponding End statement. Indenting the inside of the structure isn t a controversial practice, and the options for aligning the other keywords are somewhat limited. Listing 31-9 is an abstract representation of how this kind of formatting works:
Listing 31-9. Abstract example of the pure-block layout style.
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In this example, statement A begins the control construct and statement D ends the control construct. The alignment between the two provides solid visual closure. The controversy about formatting control structures arises in part from the fact that some languages don t require block structures. You can have an if-then followed by a single statement and not have a formal block. You have to add a begin-end pair or opening and closing braces to create a block rather than getting one automatically with each control construct. Uncoupling begin and end from the control structure as languages like C++ and Java do with { and } leads to questions about where to put the begin and end. Consequently, many indentation problems are problems only because you have to compensate for poorly designed language structures. Various ways to compensate are described in the following sections.
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