Skip to main content

difference between structure and union in C Language

In c language article we will see the difference between union and structure. Both are the user define datatype in c language. See the table which is mentioned below:
ASP.NET Video Tutorial Series

Structure

Union

1.The keyword  struct is used to define a structure
1. The keyword union is used to define a union.
2. When a variable is associated with a structure, the compiler allocates the memory for each member. The size of structure is greater than or equal to the sum of  sizes of its members. The smaller members may end with unused slack bytes.
2. When a variable is associated with a union, the  compiler allocates the  memory by considering the size of the largest memory. So, size of union is equal to the size of largest member.
3. Each member within a structure is assigned unique storage area of location.
3. Memory allocated is shared by individual members of union.
4. The address of each member will be in ascending order This indicates that memory for each member will start at different offset values.
4. The address is same for all the members of a union. This indicates that every member begins at the same offset value.
5 Altering the value of a member will not affect other members of the structure.
5. Altering the value of any of the member will alter other member values.
6. Individual member can be accessed at a time
6. Only one member can be accessed at a time.
7. Several members of a structure can initialize at once.
7. Only the first member of a union can be initialized.

Comments

  1. Thanx its help for me at the exam time

    ReplyDelete
  2. Thanks a lot ..............
    this is excellent difference between STRUCTURE and UNION.......

    ReplyDelete
  3. Very helpful in my series exams. Thanks for sharing Jobs in India

    ReplyDelete
  4. How we can multiply two no without using a*b opearation?

    ReplyDelete
    Replies
    1. use for loop and add addition of iteration like
      5*2=10
      int sum=0;
      int a=5;
      for(i=0;i<2;i++
      {
      sum=sum+a;
      }
      print(sum)

      Delete
  5. Thanks lot
    I was searching for this.......

    ReplyDelete
  6. great work .....appreciative

    ReplyDelete
  7. How to swap 2 elments a&b with out using an 3rd element

    ReplyDelete
    Replies
    1. After entering a and b values...
      Use these set of instructions to swap two numbers..


      a=a+b;
      b=a-b;
      a=a-b;

      And then print a and b values.. They will be swapped

      Delete
  8. Thanks for sharing keep up the good work.
    The blog was absolutely fantastic! Thank you for sharing this. It is worth reading for everyone. Very Informative. Keep it up.

    ReplyDelete
  9. softcare infotech is one of the best web design and development company in india.
    Movie booking api india

    ReplyDelete

Post a Comment

Popular posts from this blog

Memory representation of Linked List Data Structures in C Language

Memory representation of Linked List

             In memory the linked list is stored in scattered cells (locations).The memory for each node is allocated dynamically means as and when required. So the Linked List can increase as per the user wish and the size is not fixed, it can vary.

               Suppose first node of linked list is allocated with an address 1008. Its graphical representation looks like the figure shown below:


      Suppose next node is allocated at an address 506, so the list becomes,



  Suppose next node is allocated with an address with an address 10,s the list become,


The other way to represent the linked list is as shown below:




 In the above representation the data stored in the linked list is “INDIA”, the information part of each node contains one character. The external pointer root points to first node’s address 1005. The link part of the node containing information I contains 1007, the address of next node. The last node …

Online Examination System Project in ASP.NET

Introduction:
You can conduct your examination online using online Examination system project. Basically this project is designed for helping conductor. This application is designed for college level project its not used for education purpose.

Login Control

This module provide interface with admin login also provide security to your project. Your admin can see your result or update your questions.

<%@ Page Language="C#" Theme="all" %>
<%@ Import Namespace="System.Data.SqlClient" %>
<%@ Import Namespace="System.Data" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
    protected void btnLogin_Click(object sender, EventArgs e)
    {
        // check whether credentials are valid
        SqlConnection con = new SqlConnection(DBUtil.ConnectionString );
        try
        {
            con.O…

Unformatted Input/Output Functions with Example: C Language

In our earlier post i have discussed about sequential and compound statements. Now in this post we will discuss about unformatted i/o functions. There are several standard library functions available in this category - those that can deal with a single character and those that can deal with a string of characters. The various unformatted input/output functions in C are shown below:


getchar( ) and putchar( ) Even though getchar( ) and putchar( ) looks like functions, they are not. They are the macros that are used to read and display a character. The syntax to read a character shown below:

“ch = getchar( )” will reads a character from the keyboard and copy it into memory area which is identified by the variable ch. No arguments are required for this macro. Once the character is entered from the keyboard, the user has to press Enter key.

“putchar(ch)” outputs a character stored in a variable on the monitor. The variable should be passed as parameter as shown in the above syntax.

Example1