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Some experienced C programmers don t see the complexity in that example because it s a familiar function; they look at it and say, That s strcpy(). In this case, however, it s not quite strcpy(). It contains an error. If you said, That s strcpy() when you saw the code, you were recognizing the code, not reading it. This is exactly the situation you re in when you debug a program: The code that you overlook because you recognize it rather than read it can contain the error that s harder to find than it needs to be. The fragment shown in Listing 31-49 is functionally identical to the first and is more readable:

You can use the CREATE SYNONYM command to create synonyms for tables or views. Once created, you can use synonyms in all your SQL commands instead of real table (and view) names. For example, you could use synonyms for tables with very long table names.

strcpy( char * t, char * s ) { do { ++t; ++s; *t = *s; } while ( *t != '\0' ); }

7

In the reformatted code, the error is apparent. Clearly, t and s are incremented before *s is copied to *t. The first character is missed. The second example looks more elaborate than the first, even though the operations performed in the second example are identical. The reason it looks more elaborate is that it doesn t hide the complexity of the operations.

Synonyms are especially useful if you are accessing tables from different schemas, not owned by yourself. Without synonyms, you must explicitly prefix those object names with the schema name and a period. The Oracle data dictionary is a perfect example of synonym usage. You can simply specify the data dictionary view names in your queries, without any prefix, although you obviously don t own those data dictionary objects. Synonyms are a convenience feature. They don t provide any additional privileges, and they don t create security risks. They just save you some typing, and they also allow you to make your applications schema-independent. Schema-independence is important. By using synonyms, your applications don t need to contain explicit schema names. This makes your applications more flexible and easier to maintain, because the mapping to physical schema and object names is in the synonym definitions, separated from the application code. Figure 7-17 shows the syntax diagram for the CREATE SYNONYM command.

Improved performance doesn t justify putting multiple operations on the same line either. Because the two strcpy() routines are logically equivalent, you would expect the compiler to generate identical code for them. When both versions of the routine were profiled, however, the first version took 4.81 seconds to copy 5,000,000 strings and the second took 4.35 seconds.

In this case, the clever version carries an 11 percent speed penalty, which makes it look a lot less clever. The results vary from compiler to compiler, but in general they suggest that until you ve measured performance gains, you re better off striving for clarity and correctness first, performance second. Even if you read statements with side effects easily, take pity on other people who will read your code. Most good programmers need to think twice to understand expressions with side effects. Let them use their brain cells to understand the larger questions of how your code works rather than the syntactic details of a specific expression.

To use interaction to obtain useful information from your audience, sketch a simple photo object that relates to your topic on one or both of the Point A and Point B slides, and then use the photo to prompt conversation about speci c topics. For example, if your Point A headline reads, You re hearing con icting pieces of advice, sketch the names of your company s competitors on the screen and then hide the headline. Then, when the names appear on the slide, you might say, We understand you ve been talking to many other companies about this. What sorts of things have you been hearing Not only does this technique demonstrate to your audience that you will listen from the start and that they can participate in the conversation, but it also opens the door for you to hear information from the audience that might be useful to you.

In the next fragment, the use of boolean variables makes the purpose of the if test clearer: