ABL electronic PIC Microcontrollers PIC16 - Manual (Page 86)

Accessing Nested Structures
If structure
B
contains a field whose type is structure
A
, the members of
A
can be
accessed by two applications of the member selectors:
struct A {
int j; double x;
};
struct B {
int i; struct A a; double d;
} s, *sptr;
//...
s.i = 3; // assign 3 to the i member of B
s.a.j = 2; // assign 2 to the j member of A
sptr->d = 1.23; // assign 1.23 to the d member of B
sptr->a.x = 3.14; // assign 3.14 to x member of A
Structure Uniqueness
Each structure declaration introduces a unique structure type, so that in
struct A {
int i,j; double d;
} aa, aaa;
struct B {
int i,j; double d;
} bb;
the objects
aa
and
aaa
are both of type struct
A
, but the objects
aa
and
bb
are of
different structure types. Structures can be assigned only if the source and destina-
tion have the same type:
aa = aaa; /* OK: same type, member by member assignment */
aa = bb; /* ILLEGAL: different types */
/* but you can assign member by member: */
aa.i = bb.i;
aa.j = bb.j;
aa.d = bb.d;
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