STRUCTURES

STRUCTURES

Arrays allow to define type of variables that can hold several data items of the
same kind. Similarly, structure is another user-defined data type available in C
that allows to combine data items of different kinds.
Structures are used to represent a record. Suppose you want to keep track of
your books in a library. You might want to track the following attributes about
each book:

· Title
· Author
· Subject
· Book ID

Defining a Structure

To define a structure, you must use the struct statement. The struct statement
defines a new data type, with more than one member. The format of the struct
statement is as follows:

struct [structure tag] { member definition; member definition; ... member definition; } [one or more structure variables];

The structure tag is optional and each member definition is a normal variable
definition, such as int i; or float f; or any other valid variable definition. At the
end of the structure's definition, before the final semicolon, you can specify one
or more structure variables but it is optional. Here is the way you would declare
the Book structure:

struct Books { char title[50]; char author[50]; char subject[100]; int book_id; } book;

Accessing Structure Members

To access any member of a structure, we use the member access operator
(.). The member access operator is coded as a period between the structure
variable name and the structure member that we wish to access. You would
use the keyword struct to define variables of structure type. The following
example shows how to use a structure in a program:

#include <stdio.h> #include <string.h> struct Books { char title[50]; char author[50]; char subject[100]; int book_id; }; int main( ) { struct Books Book1; /* Declare Book1 of type Book */ struct Books Book2; /* Declare Book2 of type Book */ /* book 1 specification */ strcpy( Book1.title, "C Programming"); strcpy( Book1.author, "Nuha Ali"); strcpy( Book1.subject, "C Programming Tutorial"); Book1.book_id = 6495407; /* book 2 specification */ strcpy( Book2.title, "Telecom Billing"); strcpy( Book2.author, "Zara Ali"); strcpy( Book2.subject, "Telecom Billing Tutorial"); Book2.book_id = 6495700; /* print Book1 info */ printf( "Book 1 title : %s\n", Book1.title); printf( "Book 1 author : %s\n", Book1.author); printf( "Book 1 subject : %s\n", Book1.subject); printf( "Book 1 book_id : %d\n", Book1.book_id); /* print Book2 info */ printf( "Book 2 title : %s\n", Book2.title); printf( "Book 2 author : %s\n", Book2.author); printf( "Book 2 subject : %s\n", Book2.subject); printf( "Book 2 book_id : %d\n", Book2.book_id); return 0; }

When the above code is compiled and executed, it produces the following result:

Book 1 title : C Programming Book 1 author : Nuha Ali Book 1 subject : C Programming Tutorial Book 1 book_id : 6495407 Book 2 title : Telecom Billing Book 2 author : Zara Ali Book 2 subject : Telecom Billing Tutorial Book 2 book_id : 6495700

Structures as Function Arguments

You can pass a structure as a function argument in the same way as you pass
any other variable or pointer.

#include <stdio.h> #include <string.h> struct Books { char title[50]; char author[50]; char subject[100]; int book_id; }; /* function declaration */ void printBook( struct Books book ); int main( ) { struct Books Book1; /* Declare Book1 of type Book */ struct Books Book2; /* Declare Book2 of type Book */ /* book 1 specification */ strcpy( Book1.title, "C Programming"); strcpy( Book1.author, "Nuha Ali"); strcpy( Book1.subject, "C Programming Tutorial"); Book1.book_id = 6495407; /* book 2 specification */ strcpy( Book2.title, "Telecom Billing"); strcpy( Book2.author, "Zara Ali"); strcpy( Book2.subject, "Telecom Billing Tutorial"); Book2.book_id = 6495700; /* print Book1 info */ printBook( Book1 ); /* Print Book2 info */ printBook( Book2 ); return 0; } void printBook( struct Books book ) { printf( "Book title : %s\n", book.title); printf( "Book author : %s\n", book.author); printf( "Book subject : %s\n", book.subject); printf( "Book book_id : %d\n", book.book_id); }

When the above code is compiled and executed, it produces the following result:

Book title : C Programming Book author : Nuha Ali Book subject : C Programming Tutorial Book book_id : 6495407 Book title : Telecom Billing Book author : Zara Ali Book subject : Telecom Billing Tutorial Book book_id : 6495700

Pointers to Structures

You can define pointers to structures in the same way as you define pointer to
any other variable:

struct Books *struct_pointer;

Now, you can store the address of a structure variable in the above-defined
pointer variable. To find the address of a structure variable, place the ‘&’
operator before the structure's name as follows:

struct_pointer = &Book1;

To access the members of a structure using a pointer to that structure, you must
use the -> operator as follows:

struct_pointer->title;

Let us rewrite the above example using structure pointer.

#include <stdio.h> #include <string.h> struct Books { char title[50]; char author[50]; char subject[100]; int book_id; }; /* function declaration */ void printBook( struct Books *book ); int main( ) { struct Books Book1; /* Declare Book1 of type Book */ struct Books Book2; /* Declare Book2 of type Book */ /* book 1 specification */ strcpy( Book1.title, "C Programming"); strcpy( Book1.author, "Nuha Ali"); strcpy( Book1.subject, "C Programming Tutorial"); Book1.book_id = 6495407; /* book 2 specification */ strcpy( Book2.title, "Telecom Billing"); strcpy( Book2.author, "Zara Ali"); strcpy( Book2.subject, "Telecom Billing Tutorial"); Book2.book_id = 6495700; /* print Book1 info by passing address of Book1 */ printBook( &Book1 ); /* print Book2 info by passing address of Book2 */ printBook( &Book2 ); return 0; } void printBook( struct Books *book ) { printf( "Book title : %s\n", book->title); printf( "Book author : %s\n", book->author); printf( "Book subject : %s\n", book->subject); printf( "Book book_id : %d\n", book->book_id); }

When the above code is compiled and executed, it produces the following result:

Book title : C Programming Book author : Nuha Ali Book subject : C Programming Tutorial Book book_id : 6495407 Book title : Telecom Billing Book author : Zara Ali Book subject : Telecom Billing Tutorial Book book_id : 6495700

Bit Fields

Bit Fields allow the packing of data in a structure. This is especially useful when
memory or data storage is at a premium. Typical examples include:

· Packing several objects into a machine word, e.g. 1 bit flags can be
compacted.

· Reading external file formats -- non-standard file formats could be read
in, e.g., 9-bit integers.

C allows us to do this in a structure definition by putting :bit length after the
variable. For example:

struct packed_struct { unsigned int f1:1; unsigned int f2:1; unsigned int f3:1; unsigned int f4:1; unsigned int type:4; unsigned int my_int:9; } pack;

Here, the packed_struct contains 6 members: Four 1 bit flags f1..f3, a 4-bit
type, and a 9-bit my_int.
C automatically packs the above bit fields as compactly as possible, provided
that the maximum length of the field is less than or equal to the integer word
length of the computer. If this is not the case, then some compilers may allow
memory overlap for the fields, while others would store the next field in the next
word.