ABL electronic PIC Microcontrollers PIC16 - Manual (Page 85)

Structure Member Access
Structure and union members are accessed using the following two selection oper-
ators:
.
(period)
->
(right arrow)
The operator
.
is called the direct member selector and it is used to directly access
one of the structure’s members. Suppose that the object
s
is of struct type
S
. Then
if
m
is a member identifier of type
M
declared in
s
, the expression
s.m // direct access to member m
is of type
M
, and represents the member object
m
in
s
.
The operator
->
is called the indirect (or pointer) member selector. Suppose that
ps
is a pointer to
s
. Then if
m
is a member identifier of type
M
declared in
s
, the
expression
ps->m // indirect access to member m;
// identical to (*ps).m
is of type
M
, and represents the member object m in
s
. The expression
ps->m
is a
convenient shorthand for
(*ps).m
.
For example:
struct mystruct {
int i; char str[10]; double d;
} s, *sptr = &s;
.
.
.
s.i = 3; // assign to the i member of mystruct s
sptr -> d = 1.23; // assign to the d member of mystruct s
The expression
s.m
is an lvalue, provided that
s
is an lvalue and
m
is not an array
type. The expression
sptr->m
is an lvalue unless
m
is an array type.
MikroElektronika: Development tools - Books - Compilers
77
page
mikroC - C Compiler for Microchip PIC microcontrollers
mikroC
making it simple...