Abl-electronic PIC Microcontrollers PIC16 Manuale Utente Scaricare il pdf (Pagina 78)

Pointer Arithmetic

Pointer arithmetic in C is limited to:

- assigning one pointer to another,

- comparing two pointers,

- comparing pointer to zero (

NULL),

- adding/subtracting pointer and an integer value,

- subtracting two pointers.

The internal arithmetic performed on pointers depends on the memory model in

force and the presence of any overriding pointer modifiers. When performing

arithmetic with pointers, it is assumed that the pointer points to an array of

objects.

Arrays and Pointers

Arrays and pointers are not completely independent types in C. When name of the

array comes up in expression evaluation (except with operators

& and sizeof ), it

is implicitly converted to the pointer pointing to array’s first element. Due to this

fact, arrays are not modifiable lvalues.

Brackets

[ ] indicate array subscripts. The expression

[

exp

]

is defined as

*((

) + (

exp

))

where either:

is a pointer and

exp

is an integer, or

is an integer and

exp

is a pointer.

The following is true:

&a[i] = a + i

a[i] = *(a + i)

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