Mikroelektronika MIKROE-738 Datenbogen

212

mikoC PRO for PIC32

MikroElektronika

Untagged Structures and Typedefs

If the structure tag is omitted, an untagged structure is created. The untagged structures can be used to declare the

identifiers in the comma-delimited

member-declarator-list

to be of the given structure type (or derived from it),

but additional objects of this type cannot be declared elsewhere.

It is possible to create a typedef while declaring a structure, with or without tag:

/* With tag: */

typedef struct mystruct { ... } Mystruct;

Mystruct s, *ps, arrs[10]; /* same as struct mystruct s, etc. */

/* Without tag: */

typedef struct { ... } Mystruct;

Mystruct s, *ps, arrs[10];

Usually, there is no need to use both

tag

and

typedef

: either can be used in structure type declarations.

Untagged structure and union members are ignored during initialization.

Anonymous Structures

mikroC PRO for PIC32 allows you to declare a structure variable within another structure without giving it a name.

These nested structures are called

anonymous structures

You can access the members of an anonymous structure as if they were members in the containing structure:

struct phone{

int areacode;

long number;

};

struct person {

char name[30];

char gender;

int age;

int weight;

struct phone; // Anonymous structure; no name needed

} Jim;

Jim.number = 1234567;

}