Datasheet

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 the struct type S and
m is a member identifier of the type M declared in s, then the expression
s.m // direct access to member m
is of the type M, and represents the member object m in S.
The operator -> is called the indirect (or pointer) member selector. Suppose that the
object s is of the struct type S and ps is a pointer to s. Then if m is a member iden-
tifier of the type M declared in s, the expression
ps->m // indirect access to member m;
// identical to (*ps).m
is of the 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[21];
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 lvalue, providing that s is lvalue and m is not an array type.
The expression sptr->m is an lvalue unless m is an array type.
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MIKROELEKTRONIKA - SOFTWARE AND HARDWARE SOLUTIONS FOR EMBEDDED WORLD
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CHAPTER 5