C Foundation

What is C? C Compiler Installation C Extensions C Compiler C Interpreter C Program Structure

C Basics

C Keywords C Data Types C Identifiers C Variables C Constant C Escape Sequences C Constant and Volatile C Typecast

Operators

What is Operator C Comma Operator C Arithmetic Operators C Relational Operators C Logical Operators C Bitwise Operators C Conditional Operators C : : Operator C Operator Priority

Basic IO's

Basic IO's C Formatted Functions C Unformatted Functions C Common Functions

Control Statements

What is Control Statement C if Statement C if else Statement C Nested if Statement C Else if Statement C Break Statement C Continue Statement C Switch Statement C Goto Statement

Looping

What is Control Loop C for Loop C Nested for Loop C while Loop C Nested while Loop C do while Loop C Nested do while loop

Functions

What is Function C User Defined Functions C Recursion C Passing Parameters

Scope

Scope C Local Scope C Global Scope

Storage Classes

What is Storage Class C Auto C Extern C Static C Register

Array

What is Array C One Dimensional Array C Two Dimensional Array C Multi Dimensional Array C Arrays Of Strings

String

What is String C String Functions

Pointer

What is Pointer C Pointers Arithmetic C Pointer to Pointer C Pointers and Arrays C Pointers and Strings C Pointer to Functions Void Pointers Null Pointers C Null and Void Pointer

Structure

What is Structure C Struct within Struct C Array within Structure C Pointer to Structure C Structure and Function C Enum C Bitfield Structure C Type def

Union

What is Union

Files

What is File C read a file C write a file C File Handling C Error Handling C Low Level Disk I/O C Other file functions

Memory Allocation

What is Memory Allocation C Malloc() C Calloc() C Free() C Realloc() C Coreleft()

C Reference

All ASCII Code Basic C Questions

C Interview

C Interview Sets All Star Patterns All Number Patterns All Alphabet Patterns All Series Patterns
The ones who are crazy enough to think they can change the world are the ones who do.
- Steve Jobs

C Structures

In C programming, structure is a collection of variables of different data types. These data types are under a common structure name. So, programmers can create a collection of different information under a same entity. The record may contains student name, roll number, average under a students details entity.

Declaration of Structures

Structure name or structure tag should always precede with the keyword "struct". Structure declaration always enclosed between 2braces{}(curly braces). The data types declared inside a structure are known as members of structure. The variables declared inside a structure are known as member names of structure. The member names inside the declaration of structure should not be same. However, it can be a same variable name declared outside the structure declaration. The members of structure can be integer, floating point, char, double, pointers, arrays, other structure can be declared as members.

Syntax - Structures

structures
struct structname {
data type membername1;
data type membername2;
}variable1, variable2;

Declaration of Structure Variables

A structure variable can be declared in two-methods

  • Declaring variables with structure declaration
  • Declaring variables using structure tag

Declaring Variables With Structure Declaration

variables-structure-declaration
struct structurename {
member declaration;
} variable1, variable2;

Declaring Variables Using Structure Tag

In this type, we can declare variables separately from structure declaration by using Structure name. The Structure variable declaration will be like the following:

variables-structure-tag
struct structname variable1, variable2;

Initialization of Structures

A structure can be initialized by assigning values to the members within structure.

initialization-structure
struct   = {value1, value2...};

C Program - Structures

structures.c
#include <stdio.h>
int main()
{
//Structure Declaration
struct student {
char name[30];
int rollno;
float average;
};
//Structure Variable Declaration and Initialization
struct student record1 = {"Siva", 43, 76.54};
printf("\nStudent Name : %s", record1.name);
printf("\nStudent RollNo : %d ", record1.rollno);
printf("\nStudent Average: %d ", record1.average);
return 0;
}
  • Student Name : Siva
  • Student RollNo : 43
  • Student Average: 76.73

Note:

The structure program defines the student record, which has student name, rollno, average as structure members and record1 as structure variable. Then, the structure variables are initialized by the respective statement.

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