This document provides information about structures in C programming. It defines a structure with multiple members, and shows how to declare structure variables. It also demonstrates how to access structure members using the dot operator, create pointer variables that point to structures, and define an array of structures where multiple structure variables are declared as an array. The key points covered are defining a structure tag and members, declaring structure variables, accessing members with the dot operator, creating pointer variables of structure type, and declaring an array of structures.

1. Mr. R.D.SIVAKUMAR, M.Sc.,M.Phil.,M.Tech.,
Assistant Professor of Computer Science &
Assistant Professor and Head, Department of M.Com.(CA),
Ayya Nadar Janaki Ammal College,
Sivakasi – 626 124.
Mobile: 099440-42243
e-mail : sivamsccsit@gmail.com
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Structures

2. Structures
To define a structure, you must use the struct statement. The struct statement
defines a new data type, with more than one member for your program. The format of
the struct statement is this:
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:

3. Accessing the Members of the Structure
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 struct keyword to define
variables of structure type. Following is the example to explain usage of structure:
Pointers to Structure
Pointers can be accessed along with structures. A pointer variable of structure can
be created as below:
struct name {
member1;
member2;
. .
}; -------- Inside function -------
struct name *ptr;Here, the pointer variable of type struct name is created.

4. An Array of Structure
As you know, C Structure is collection of different datatypes ( variables )
which are grouped together. Whereas, array of structures is nothing but
collection of structures. This is also called as structure array in C.

5. Thank you..!!