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

From Script | Spoken-Tutorial
Jump to: navigation, search
 
(10 intermediate revisions by 2 users not shown)
Line 1: Line 1:
−
 
 
{| Border=1
 
{| Border=1
−
! <center>Time</center>
+
|'''Time'''
−
! <center>Narration</center>
+
|'''Narration'''
  
 
|-
 
|-
Line 12: Line 11:
 
| In this tutorial, we will learn about:   
 
| In this tutorial, we will learn about:   
  
−
* '''typedef keyword'''
+
'''typedef keyword'''
−
* '''union keyword'''  
+
'''union keyword'''  
 
with the help of some examples.
 
with the help of some examples.
  
Line 19: Line 18:
 
| 00:17
 
| 00:17
 
| For this tutorial, I am using:
 
| For this tutorial, I am using:
−
* '''Ubuntu''' Operating System version 11.10.  
+
'''Ubuntu''' Operating System version '''11.10'''.  
−
* '''gcc compiler''' version 4.6.1 on '''Ubuntu'''.
+
'''gcc compiler''' version '''4.6.1''' on '''Ubuntu'''.
  
 
|-
 
|-
Line 32: Line 31:
 
|-
 
|-
 
| 00:43
 
| 00:43
−
| I will start with an introduction to '''typedef keyword.'''
+
| I will start with an introduction to '''typedef''' keyword.
  
 
|-
 
|-
Line 60: Line 59:
 
|-
 
|-
 
| 01:28
 
| 01:28
−
| Note that our filename is ''''pallindrome.c''''.
+
| Note that our filename is '''"pallindrome.c"'''.
  
 
|-
 
|-
 
| 01:34
 
| 01:34
−
| In this program, we will check whether the given number is a '''pallindrome''' or not.
+
| In this program, we will check whether the given number is a '''palindrome''' or not.
  
 
|-
 
|-
 
| 01:41
 
| 01:41
−
| We have given '''alias '''name as 'uint' to the''' unsigned int datatype '''using''' typedef''' keyword.
+
| We have given '''alias '''name as 'uint' to the''' unsigned int datatype ''', using''' typedef''' keyword.
  
 
|-
 
|-
 
| 01:52
 
| 01:52
−
| Here we are using ''' uint '''to '''declare''' the '''variables.'''
+
| Here we are using 'uint' to '''declare''' the '''variables.'''
  
 
|-
 
|-
 
| 01:59
 
| 01:59
−
| This is the logic for '''pallindrome'''.
+
| This is the logic for '''palindrome'''.
  
 
|-
 
|-
Line 92: Line 91:
 
|-
 
|-
 
| 02:29
 
| 02:29
−
| Type:''' dot slash pallindrome'''
+
| Type: '''dot slash pallindrome'''
  
 
|-
 
|-
 
|02:34
 
|02:34
−
| We see: '''"Enter any three digit number"'''.
+
| We see: '''"Enter any three digit number:"'''.
  
 
|-
 
|-
Line 104: Line 103:
 
|-
 
|-
 
| 02:42
 
| 02:42
−
| The output is: '''"Given number is a palindrome number".'''
+
| The output is: '''Given number is a palindrome number'''.
  
 
|-
 
|-
 
| 02:47
 
| 02:47
−
| Now we will learn about '''union datatype.'''
+
| Now we will learn about '''union''' datatype.
  
 
|-
 
|-
 
| 02:52
 
| 02:52
−
| '''Union''' is a collection of different datatypes grouped together.
+
| '''union''' is a collection of different datatypes grouped together.
  
 
|-
 
|-
 
| 02:57
 
| 02:57
−
| '''Union '''allocates one common storage space for all its members.
+
| '''union '''allocates one common storage-space for all its members.
  
 
|-
 
|-
 
| 03:03
 
| 03:03
−
| We can access only one member of union at a time.  
+
| We can access only one member of '''union''' at a time.  
  
 
|-
 
|-
 
| 03:08
 
| 03:08
 
| Syntax1:
 
| Syntax1:
−
'''union union_name''' within curly brackets '''members;''' after curly brackets '''union_variable'''
+
'''union union_name''' within curly brackets '''members;''' after curly brackets '''union_variable'''and a semicolon.
−
and a semicolon.
+
  
 
|-
 
|-
Line 144: Line 142:
 
|-
 
|-
 
| 03:47
 
| 03:47
−
| Note that our filename is "union dot c".
+
| Note that our filename is '''union dot c'''.
  
 
|-
 
|-
 
| 03:52
 
| 03:52
−
| We have declared '''union''' named '''student.'''
+
| We have declared '''union''' named '''student'''.
  
 
|-
 
|-
 
| 03:56
 
| 03:56
−
| Here we have three variables- '''english''', '''maths''' and''' science.'''
+
| Here, we have three variables- '''english''', '''maths''' and''' science.'''
  
 
|-
 
|-
Line 162: Line 160:
 
| Here we can access the '''union''' members using a '''union''' variable:
 
| Here we can access the '''union''' members using a '''union''' variable:
  
−
*'''stud dot english'''
+
'''stud dot english'''
−
*'''stud dot maths'''
+
'''stud dot maths'''
−
*'''stud dot science'''
+
'''stud dot science'''
  
 
|-
 
|-
Line 172: Line 170:
 
|-
 
|-
 
| 04:26
 
| 04:26
−
| Let us execute. On the '''terminal''', type: '''gcc space union dot c space hyphen o space union'''
+
| Let us execute on the '''terminal'''. Type: '''gcc space union dot c space hyphen o space union'''
 
Type: '''dot slash union'''
 
Type: '''dot slash union'''
  
 
|-
 
|-
 
|04:44
 
|04:44
−
| The output is displayed as: '''"Total is 228"'''.
+
| The output is displayed as: '''Total is 228'''.
  
 
|-
 
|-
Line 185: Line 183:
 
|-
 
|-
 
| 04:55
 
| 04:55
−
| '''Union''' allocates a common storage space for all its members.
+
| '''union''' allocates a common storage-space for all its members.
  
 
|-
 
|-
 
| 05:01
 
| 05:01
−
| '''Structure''' allocates separate storage space for all its members.
+
| '''structure''' allocates separate storage-space for all its members.
  
 
|-
 
|-
 
| 05:07
 
| 05:07
−
| '''Union''' occupies lower '''memory space'''.
+
| '''union''' occupies lower '''memory space'''.
  
 
|-
 
|-
 
| 05:11
 
| 05:11
−
| '''Structure''' occupies higher memory space.
+
| '''structure''' occupies higher memory space.
  
 
|-
 
|-
Line 206: Line 204:
 
|-
 
|-
 
| 05:27
 
| 05:27
−
| '''Memory''' allocation for '''union''' variable will be''' 8 bytes.'''
+
| '''Memory''' allocation for '''union''' variable will be 8 bytes as '''double datatype''' will occupy the maximum '''memory space'''.
−
 
+
−
As '''double datatype''' will occupy the maximum '''memory space'''.
+
  
 
|-
 
|-
 
| 05:39
 
| 05:39
−
| Exampls for '''structure:'''
+
| Example for '''structure:'''
 
'''struct student{int mark;<nowiki>char name[6];</nowiki>double average;};'''
 
'''struct student{int mark;<nowiki>char name[6];</nowiki>double average;};'''
  
 
|-
 
|-
 
| 05:48
 
| 05:48
−
| '''Memory''' allocation for '''structure''' variable will be: '''2bytes+6bytes+8bytes =16bytes.'''
+
| '''Memory''' allocation for '''structure''' variable will be: 2bytes+6bytes+8bytes =16bytes.
  
 
|-
 
|-
Line 230: Line 226:
 
| 06:06
 
| 06:06
 
| In this tutorial, we learnt:
 
| In this tutorial, we learnt:
−
 
+
'''typedef '''
−
* '''typedef '''
+
'''union''' and
−
* '''union'''
+
Difference between '''union''' and '''structure.'''
−
* Difference between '''union''' and '''structure.'''
+
  
 
|-
 
|-
Line 241: Line 236:
 
|-
 
|-
 
| 06:17
 
| 06:17
−
| write a program to display records of an employee.
+
| write a program to display records of an employee
  
 
|-
 
|-
 
| 06:21
 
| 06:21
−
| Like '''name, address, salary'''.
+
| like '''name, address, salary'''.
  
 
|-
 
|-
Line 253: Line 248:
 
|-
 
|-
 
| 06:29
 
| 06:29
−
| Give an '''alias''' name as '''emp''' using '''typedef.'''
+
| Give an '''alias''' name as "'''emp'''" using '''typedef.'''
  
 
|-
 
|-
Line 273: Line 268:
 
|-
 
|-
 
| 06:53
 
| 06:53
−
|* Gives certificates to those who pass an online test. For more details, please write to contact@spoken-tutorial.org
+
| Gives certificates to those who pass an online test. For more details, please write to contact@spoken-tutorial.org
  
 
|-
 
|-
 
| 07:04
 
| 07:04
−
| '''Spoken Tutorial''' Project is a part of the '''Talk to a Teacher''' project.
+
| '''Spoken Tutorial''' project is a part of the '''Talk to a Teacher''' project.
  
 
|-
 
|-
Line 285: Line 280:
 
|-
 
|-
 
| 07:16
 
| 07:16
−
| More information on this mission is available at:
+
| More information on this mission is available at the link shown below:http://spoken-tutorial.org\NMEICT-Intro
−
http://spoken-tutorial.org\NMEICT-Intro
+
  
 
|-
 
|-
 
| 07:22
 
| 07:22
−
| This is Ashwini Patil from IIT Bombay.
+
| This is Ashwini Patil from '''IIT Bombay''', signing off.Thank you for joining.
−
Thank you for joining.
+
  
 
|}
 
|}

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

Retrieved from "https://script.spoken-tutorial.org/index.php?title=Advance-C/C2/Union-and-Typedef/English-timed&oldid=30281"