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Relative performance of these operations has changed significantly since the first edition of Code Complete, so if you re approaching code tuning with 10-year-old ideas about performance, you might need to update your thinking. Most of the common operations are about the same price routine calls, assignments, integer arithmetic, and floating-point arithmetic are all roughly equal. Transcendental math functions are extremely expensive. Polymorphic routine calls are a bit more expensive than other kinds of routine calls. This table, or a similar one that you make, is the key that unlocks all the speed improvements described in 26, Code-Tuning Techniques. In every case, improving speed comes from replacing an expensive operation with a cheaper one. The next chapter provides examples of how to do so.

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Since small parts of a program usually consume a disproportionate share of the run time, measure your code to find the hot spots. Once you ve found the hot spots and optimized them, measure the code again to assess how much you ve improved it. Many aspects of performance are counterintuitive. The earlier case in this chapter, in which 10 lines of code were significantly faster and smaller than one line, is one example of the ways that code can surprise you. Experience doesn t help much with optimization either. A person s experience might have come from an old machine, language, or compiler and when any of

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i am creating windows application using crystal report. now i want to add qr code into my report how i generate qr code and place to my report.

Suppose you want to query a specific data dictionary view, and you don t know the actual column names of that view. In that case, you can use the SQL*Plus command DESCRIBE, just as you would do for regular tables. As you can see in Listing 3-11, you can use the DESCRIBE command, or you can query the data dictionary view DICT_COLUMNS. Listing 3-11. Using the DESCRIBE Command and the DICT_COLUMNS View describe ALL_USERS Name Null Type USERNAME NOT NULL VARCHAR2(30) USER_ID NOT NULL NUMBER CREATED NOT NULL DATE select column_name, comments from dict_columns where table_name = 'ALL_USERS'; COLUMN_NAME --------------------------USERNAME USER_ID CREATED COMMENTS ------------------------Name of the user ID number of the user User creation date

those things changes, all bets are off. You can never be sure about the effect of an optimization until you measure the effect. A few years ago I wrote a program that summed the elements in a matrix. The original code looked like the next example.

sum = 0; for ( row = 0; row < rowCount; row++ ) { for ( column = 0; column < columnCount; column++ ) { sum = sum + matrix[ row ][ column ]; } }

This code was straightforward, but performance of the matrix-summation routine was critical, and I knew that all the array accesses and loop tests had to be expensive. I knew from computer-science classes that every time the code accessed a two-dimensional array, it performed expensive multiplications and additions. For a 100-by-100 matrix, that totaled 10,000 multiplications and additions plus the loop overhead. By converting to pointer notation, I reasoned, I could increment a pointer and replace 10,000 expensive multiplications with 10,000 relatively cheap increment operations. I carefully converted the code to pointer notation and got this:

Listing 3-12 shows a query against the NLS_SESSION_PARAMETERS view (NLS stands for National Language Support). The result shows, for example, the NLS_DATE_FORMAT value used to display dates.

FIGURE 5-2 The cells where you will write the rest of the headlines in Act II of the story template.

sum = 0; elementPointer = matrix; lastElementPointer = matrix[ rowCount - 1 ][ columnCount - 1 ] + 1; while ( elementPointer < lastElementPointer ) { sum = sum + *elementPointer++; }

experience in which converting to pointers hurt perform1 ance by about 10 percent. 2 The same conversion had in 3 another setting improved performance more than 50 percent. See Software Exploratorium: Writing Efficient C Programs (Bentley 1991).

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