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;
mikroC - C Compiler for Microchip PIC microcontrollers
mikroC
making it simple...
78
MikroElektronika: Development tools - Books - Compilers
page
