5.4. Pointer Arithmetic
Arithmetic can be performed on pointers just like any other
variable, this is only useful in a few cases though. If you were (for
some reason) to divide a pointer by two it would then point to an area
of your computers memory that would probably not belong to your
program. If your program tried to read or write to this area of
memory the text segmentation fault
will display and your program will abort. A "segmentation
fault" occurs when a program tries to access a segment of
memory that it does not have permission to access.
There are times however when simple addition can be used on
a pointer. We'll see this in the next chapter when we discuss arrays
(multiple variables at consecutive memory addresses). In the case of
addition (and subtraction), arithmetic is performed in units equal to
the size of the pointers data type.