Datasheet

This allows you to write loops which access the array elements in a sequence by
means of incrementing pointer — in the last iteration you will have the pointer point-
ing to one element past the array, which is legal. However, applying an indirection
operator (*) to a “pointer to one past the last element” leads to undefined behavior.
For example:
void f (some_type a[], int n) {
/* function f handles elements of array a; */
/* array a has n elements of type some_type */
int i;
some_type *p=&a[0];
for ( i = 0; i < n; i++ ) {
/* .. here we do something with *p .. */
p++; /* .. and with the last iteration p exceeds
the last element of array a */
}
/* at this point, *p is undefined! */
}
Pointer Subtraction
Similar to addition, you can use operators -, -- , and -= to subtract an integral
value from a pointer.
Also, you may subtract two pointers. The difference will be equal to the distance
between two pointed addresses, in bytes.
For example:
int a[10];
int *pi1 = &a[0];
int *pi2 = &a[4];
i = pi2 - pi1; /* i equals 8 */
pi2 -= (i >> 1); /* pi2 = pi2 - 4: pi2 now points to [0] */
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MIKROELEKTRONIKA - SOFTWARE AND HARDWARE SOLUTIONS FOR EMBEDDED WORLD
Language Reference
mikroC PRO for AVR
CHAPTER 5