Difference between revisions of "Advance-C/C2/Union-and-Typedef/English-timed"

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! <center>Time</center>
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|'''Time'''
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! <center>Narration</center>
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|'''Narration'''
  
 
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| In this tutorial, we will learn about:   
 
| In this tutorial, we will learn about:   
  
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* '''typedef keyword'''
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'''typedef keyword'''
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* '''union' keyword'''  
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'''union keyword'''  
 
with the help of some examples.
 
with the help of some examples.
  
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| 00:17
 
| 00:17
 
| For this tutorial, I am using:
 
| For this tutorial, I am using:
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* '''Ubuntu''' Operating System version '''11.10'''.  
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'''Ubuntu''' Operating System version '''11.10'''.  
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* '''gcc compiler''' version '''4.6.1''' on '''Ubuntu'''.
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'''gcc compiler''' version '''4.6.1''' on '''Ubuntu'''.
  
 
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|00:29
 
|00:29
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| To follow this tutorial, you should be familiar with '''C''' tutorials.
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| To follow this tutorial, you should be familiar with 'C' tutorials.
  
 
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| Note that our filename is '''pallindrome.c'''.
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| Note that our filename is '''"pallindrome.c"'''.
  
 
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| We have given '''alias '''name as '''uint''' to the''' unsigned int datatype ''', using''' typedef''' keyword.
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| We have given '''alias '''name as 'uint' to the''' unsigned int datatype ''', using''' typedef''' keyword.
  
 
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| Here we are using '''uint''' to '''declare''' the '''variables.'''
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| Here we are using 'uint' to '''declare''' the '''variables.'''
  
 
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| Type: '''gcc space pallindrome dot c  space hyphen o space pallindrome'''. Press '''Enter'''.
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| Type: ''' gcc space pallindrome dot c  space hyphen o space pallindrome'''. Press '''Enter'''.
  
 
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| We see: '''Enter any three digit number:'''.
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| We see: '''"Enter any three digit number:"'''.
  
 
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| The output is: "Given number is a palindrome number".
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| The output is: '''Given number is a palindrome number'''.
  
 
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| Syntax1:
 
| Syntax1:
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'''union union_name''' within curly brackets '''members;''' after curly brackets '''union_variable'''
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'''union union_name''' within curly brackets '''members;''' after curly brackets '''union_variable'''and a semicolon.
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and a semicolon.
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| Here we can access the '''union''' members using a '''union''' variable:
 
| Here we can access the '''union''' members using a '''union''' variable:
  
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* '''stud dot english'''
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'''stud dot english'''
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* '''stud dot maths'''
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'''stud dot maths'''
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* '''stud dot science'''
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'''stud dot science'''
  
 
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| ''''structure'''' allocates separate storage-space for all its members.
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| '''structure''' allocates separate storage-space for all its members.
  
 
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| In this tutorial, we learnt:
 
| In this tutorial, we learnt:
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'''typedef '''
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* '''typedef '''
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'''union''' and  
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* '''union''' and  
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Difference between '''union''' and '''structure.'''
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* Difference between '''union''' and '''structure.'''
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| Give an '''alias''' name as '''emp''' using '''typedef.'''
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| Give an '''alias''' name as "'''emp'''" using '''typedef.'''
  
 
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| The Spoken Tutorial project team: Conducts workshops using spoken tutorials.  
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| The Spoken Tutorial project team: * Conducts workshops using spoken tutorials.  
  
 
|-
 
|-
 
| 06:53
 
| 06:53
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|Gives certificates to those who pass an online test. For more details, please write to contact@spoken-tutorial.org
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| Gives certificates to those who pass an online test. For more details, please write to contact@spoken-tutorial.org
  
 
|-
 
|-

Latest revision as of 15:32, 20 February 2017

Time Narration
00:01 Welcome to the Spoken Tutorial on Typedef and Union in C.
00:07 In this tutorial, we will learn about:

typedef keyword union keyword with the help of some examples.

00:17 For this tutorial, I am using:

Ubuntu Operating System version 11.10. gcc compiler version 4.6.1 on Ubuntu.

00:29 To follow this tutorial, you should be familiar with 'C' tutorials.
00:36 If not, for relevant tutorials, please visit our website which is as shown.
00:43 I will start with an introduction to typedef keyword.
00:49 Typedef keyword is used to give symbolic name to an existing type or user-defined datatypes.
00:58 It is a way to define alias to the commands.
01:03 It helps to provide clarity to the code.
01:07 It makes the code easier to understand and change.
01:12 Syntax: typedef existing_name alias_name. Example: typedef unsigned int uint;
01:24 Let us go through an example code.
01:28 Note that our filename is "pallindrome.c".
01:34 In this program, we will check whether the given number is a palindrome or not.
01:41 We have given alias name as 'uint' to the unsigned int datatype , using typedef keyword.
01:52 Here we are using 'uint' to declare the variables.
01:59 This is the logic for palindrome.
02:03 Now, let us execute the program.
02:06 Open the terminal by pressing Ctrl+Alt+T keys simultaneously on your keyboard.
02:16 Type: gcc space pallindrome dot c space hyphen o space pallindrome. Press Enter.
02:29 Type: dot slash pallindrome
02:34 We see: "Enter any three digit number:".
02:38 I will enter 121.
02:42 The output is: Given number is a palindrome number.
02:47 Now we will learn about union datatype.
02:52 union is a collection of different datatypes grouped together.
02:57 union allocates one common storage-space for all its members.
03:03 We can access only one member of union at a time.
03:08 Syntax1:

union union_name within curly brackets members; after curly brackets union_variableand a semicolon.

03:21 We also have an alternate syntax.

Syntax 2: union union_name within curly brackets members; after curly brackets semicolon union union_name union_variable;

03:39 Let us see an example.
03:41 I have a code file; let us go through it.
03:47 Note that our filename is union dot c.
03:52 We have declared union named student.
03:56 Here, we have three variables- english, maths and science.
04:02 In main() function, we have declared a union variable as stud.
04:09 Here we can access the union members using a union variable:

stud dot english stud dot maths stud dot science

04:21 Then we calculate the total marks and display it.
04:26 Let us execute on the terminal. Type: gcc space union dot c space hyphen o space union

Type: dot slash union

04:44 The output is displayed as: Total is 228.
04:50 Let us see the difference between structure and union.
04:55 union allocates a common storage-space for all its members.
05:01 structure allocates separate storage-space for all its members.
05:07 union occupies lower memory space.
05:11 structure occupies higher memory space.
05:14 Example for union:

union student{int marks;char name[6];double average;};

05:27 Memory allocation for union variable will be 8 bytes as double datatype will occupy the maximum memory space.
05:39 Example for structure:

struct student{int mark;char name[6];double average;};

05:48 Memory allocation for structure variable will be: 2bytes+6bytes+8bytes =16bytes.
06:00 This brings us to the end of this tutorial.
06:04 Let us summarize.
06:06 In this tutorial, we learnt:

typedef union and Difference between union and structure.

06:14 As an assignment,
06:17 write a program to display records of an employee
06:21 like name, address, salary.
06:25 Define a union named employee.
06:29 Give an alias name as "emp" using typedef.
06:35 Watch the video available at the link shown below.
06:39 It summarizes the Spoken Tutorial project.
06:42 If you do not have good bandwidth, you can download and watch it.
06:47 The Spoken Tutorial project team: * Conducts workshops using spoken tutorials.
06:53 Gives certificates to those who pass an online test. For more details, please write to contact@spoken-tutorial.org
07:04 Spoken Tutorial project is a part of the Talk to a Teacher project.
07:08 It is supported by the National Mission on Education through ICT, MHRD, Government of India.
07:16 More information on this mission is available at the link shown below:http://spoken-tutorial.org\NMEICT-Intro
07:22 This is Ashwini Patil from IIT Bombay, signing off.Thank you for joining.

Contributors and Content Editors

PoojaMoolya, Pratik kamble, Sandhya.np14

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