Abl-electronic PIC Microcontrollers PIC16 Manuel d'utilisateur télécharger pdf (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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Abl-electronic PIC Microcontrollers PIC16 Manuel d'utilisateur Page 86

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