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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.
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