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This recommendation goes against the common C convention for handling character data (as in the second example), but it reinforces the idea that the expression is working with character data rather than logical data. Some C conventions aren t based on maximizing readability or maintainability, and this is an example of one. Fortunately, this whole issue is fading into the sunset as more code is written using C++ and STL strings and other non-C-null-terminated strings.
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Compare pointers to NULL For pointers, write
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Like the recommendation for characters, this one goes against the established C convention, but the gain in readability justifies it.
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Common Problems with Boolean Expressions
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Boolean expressions are subject to a few additional pitfalls that pertain to specific languages.
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In C and C++, put constants on the left side of comparisons C++ poses some special problems with boolean expressions. In C++, interchanging bitwise operators with logical operators is a common gotcha. It s easy to use <;$LB> instead of <;$LB><;$LB> or & instead of &&.
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19. General Control Issues
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If you have problems mistyping = instead of ==, consider the programming convention of putting constants and literals on the left sides of expressions, like this:
C++ Example of Putting a Constant on the Left Side of an Expression An Error that the Compiler Will Catch
if ( MIN_ELEMENTS = i ) ...
In this expression, the compiler should flag the single = as an error since assigning anything to a constant is invalid. In contrast, in this expression:
C++ Example of Putting a Constant on the Right Side of an Expression An Error that the Compiler Might not Catch
if ( i = MIN_ELEMENTS ) ...
the compiler will flag this only as a warning, and only if you have compiler warnings fully turned on. This recommendation conflicts with the recommendation to use number-line ordering. My personal preference is to use number line ordering and let the compiler warn me about unintended assignments.
In C++, consider creating preprocessor macro substitutions for &&, <;$LB><;$LB>, and == (but only as a last resort) If you have such a problem, it s possible to create #define macros for boolean and and or, and use AND and OR instead of && and <;$LB><;$LB>. Similarly, using = when you mean == is an easy mistake to make. If you get stung often by this one, you might create a macro like EQUALS for logical equals (==).
Many experienced programmers view this approach as aiding readability for the programmer who can t keep details of the programming language straight but degrading readability for the programmer who is more fluent in the language. In addition, most compilers will provide error warnings for usages of assignment and bitwise operators that seem like errors. Turning on full compiler warnings is usually a better option than creating non-standard macros.
In Java, know the difference between a==b and a.equals(b) In Java, a==b tests for whether a and b refer to the same object, whereas a.equals(b) tests for whether the objects have the same logical value. In general, Java programs should use expressions like a.equals(b) rather than a==b.
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19. General Control Issues
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19.2 Compound Statements (Blocks)
A compound statement or block is a collection of statements that are treated as a single statement for purposes of controlling the flow of a program. Compound statements are created by writing { and } around a group of statements in C++, C#, C, and Java. Sometimes they are implied by the keywords of a command, such as For and Next in Visual Basic. Here are some guidelines for using compound statements effectively:
Man y programmer-oriented text editors have commands that match braces, brackets, and parentheses. For details, see Editing in Section 30.2.
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