By Robert J. Traister (Auth.)

ISBN-10: 012697408X

ISBN-13: 9780126974089

This publication positive factors whole insurance on utilizing and controlling c program languageperiod tips to make C purposes extra robust and expressive. This variation is up to date and revised to mirror the alterations which were led to with the total adoption of ANSI C

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Additional resources for Mastering C Pointers. Tools for Programming Power, Volume 1

Sample text

This sample program is only slightly different from the one that follows: main() { printf ("%5\n", "DATA"); } We already know that the % 5 conversion specification tells printf() to expect a char pointer argument, a pointer to the start of a string in memory. The objects at this memory location will be read and displayed on the screen as single characters until the NULL is encountered. Therefore, "DATA" is a pointer. In the former program, p will contain the same address as "DATA". If you don't fully understand this, the following program may help: main() { printf("%u\n", "DATA"); > This program will display the memory address where the first letter in the string constant is stored.

There is one other area of efficiency in which the latter program excels. There is no strcpyO function as in the first example. This function is unnecessary, because no copy of the constant is made. The pointer is directed to the memory location of the constant. Since the function does not have to be invoked, the storage required for its source code is not a part of the executable program. More memory space is spared. Plus, the execution time required by the strcpyO function is saved. The end result is that the latter program executes faster and requires considerably less memory space.

The area of memory to which it points . . can be any random value of from 0 to 65536 (assuming use of a small-memory-model compiler using 2-byte pointers). Here again is the proverbial crap shoot. If you have ever written and run a program along the lines of this latter example, you were writing things to memory locations not reserved for that purpose. You were POKEing around in memory at random. There's a pretty good chance that, if your program was simple and small, like this example, nothing unusual took place, and the program ran as expected.

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Mastering C Pointers. Tools for Programming Power, Volume 1 by Robert J. Traister (Auth.)


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