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

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

By Robert J. Traister (Auth.)

This publication positive aspects entire insurance on utilizing and controlling interval tips that could make C functions extra robust and expressive. This variation is up-to-date and revised to mirror the alterations which have been caused with the whole adoption of ANSI C

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Extra info for Mastering C Pointers. Tools for Programming Power, Volume 1

Sample text

The strcpyO function copies a string constant into the bytes allocated to the array. Next, p is assigned the address of the array. When printfO gets the argument, it is a pointer to a string in memory. Note that the ampersand operator was not used with the array in making the address assignment to pointer, p. Remember, a is the name of the array and is also a pointer, itself, when used without the brackets. Therefore, a returns an address to p, which is expecting one. While totally unnecessary, the pointer assignment line could have been written as: p = &a[0]; This would assign p the same address as before, since this is the address returned by the original assignment line.

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. On my system, the address is at memory location 162 in the 64K data segment.

Rather, it simply uses this initial address as a reference point, adding a value of 3 to it in order to access a particular character. However, there is a slightly simpler method of accomplishing the same thing the previous programs did while saving a bit more storage space. = '\0') p r i n t f ("XcNn", * a + +) ; } Such an alteration reduces our object code to 233 bytes. This meth- 61 String Pointers od actually changes the value of the pointer. = '\0' is used. This simply states that the loop is to continue cycling until the character returned by * a is the NULL, which is represented in standard C terminology as ' \ 0 ' .

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