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Write pairs of braces together Fill in the middle after you write both the opening and closing parts of a block. People often complain about how hard it is to match pairs of braces or beginand-end pairs, and that s a completely unnecessary problem. If you follow this guideline, you will never have trouble matching such pairs again.
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Write this first: Write this next: Write this last:
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for ( i =0; i < maxLines; i++ ) for ( i =0; i < maxLines; i++ ) { } for ( i =0; i < maxLines; i++ ) { // whatever goes in here ... }
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This applies to all blocking structures including if, for and while in C++ and Java and to If-Then-Else, For-Next, and While-Wend combinations in Visual Basic.
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Use braces to clarify conditionals Conditionals are hard enough to read without having to determine which statements go with the if test. Putting a single statements after an if test is sometimes appealing aesthetically, but under maintenance such statements tend to become more complicated blocks, and single statements are error prone when that happens.
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Use blocks to clarify your intentions regardless of whether the code inside the block is 1 line or 20.
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19.3 Null Statements
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In C++, it s possible to have a null statement, a statement consisting entirely of a semicolon, as shown here:
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C++ Example of a Traditional Null Statement
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while ( recordArray.Read( index++ ) != recordArray.EmptyRecord() )
de Complete
19. General Control Issues
Page 15
The while in C++ requires that a statement follow, but it can be a null statement. The semicolon on a line by itself is a null statement. Here are guidelines for handling null statements in C++:
3 CROSS-REFERENCE
4 best way to handle null
statements is probably to avoid them. For details, see 6 Avoid empty loops in 7 Section 16.2.
Call attention to null statements Null statements are uncommon, so make them obvious. One way is to give the semicolon of a null statement a line of its own. Indent it, just as you would any other statement. This is the approach shown in the previous example. Alternatively, you can use a set of empty braces to emphasize the null statement. Here are two examples:
C++ Examples of a Null Statement That s Emphasized
9 This is one way to show the null statement.
while ( recordArray.Read( index++ ) ) != recordArray.EmptyRecord() ) {}; while ( recordArray.Read( index++ ) != recordArray.EmptyRecord() ) { ; }
3 This is another way to show it. 4
Create a preprocessor null() macro or inline function for null statements The statement doesn t do anything but make indisputably clear the fact that nothing is supposed to be done. This is similar to marking blank document pages with the statement This page intentionally left blank. The page isn t really blank, but you know nothing else is supposed to be on it.
Here s how you can make your own null statement in C++ using #define. (You could also create it as an inline function, which would have the same effect.)
C++ Example of a Null Statement That s Emphasized with null()
#define null() ... while ( recordArray.Read( index++ ) != recordArray.EmptyRecord() ) { null(); }
In addition to using null()in empty while and for loops, you can use it for unimportant choices of a switch statement; including null() makes it clear that the case was considered and nothing is supposed to be done. Note that this null() is different from the traditional preprocessor macro NULL that s used for a null pointer. The value of the pointer NULL depends on your hardware but is usually O, or OL, or something like that. It s never simply empty, as the null() here is. If your language doesn t support preprocessor macros or inline functions, you could create a null() routine that simply immediately returns control back to the calling routine.
de Complete
19. General Control Issues
Page 16
Consider whether the code would be clearer with a non-null loop body Most of the code that results in loops with empty bodies relies on side effects in the loop control code. In most cases, the code is more readable when the side effects are made explicit, as shown below:
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