Difference between revisions of "Advanced-C++/C2/Constructor-And-Destructor/English-timed"

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|-
 
|-
 
| 00:01
 
| 00:01
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| Welcome to the spoken tutorial on '''Constructors''' and '''Destructors''' in C++.
+
| Welcome to the '''spoken tutorial''' on '''Constructors and Destructors''' in '''C++'''.
  
 
|-
 
|-
 
| 00:07
 
| 00:07
−
| In this tutorial we will learn,
+
| In this tutorial, we will learn:
  
 
|-
 
|-
 
| 00:09
 
| 00:09
−
| '''Constructors'''
+
|* '''Constructors'''
  
 
|-
 
|-
 
| 00:10
 
| 00:10
−
| '''Types of constructors'''
+
|* '''Types of constructors'''
  
 
|-
 
|-
 
| 00:12
 
| 00:12
−
| '''Destructors.'''
+
|* '''Destructors.'''
  
 
|-
 
|-
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|-
 
|-
 
| 00:17
 
| 00:17
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| To record this tutorial, I am using
+
| To record this tutorial, I am using:
  
 
|-
 
|-
 
| 00:20
 
| 00:20
−
| '''Ubuntu Operating System''' version 11.10,
+
|* '''Ubuntu Operating System''' version 11.10,
  
 
|-
 
|-
 
| 00:23
 
| 00:23
−
| '''g++''' '''Compiler''' version 4.6.1.
+
|* '''g++''' '''Compiler''' version 4.6.1.
  
 
|-
 
|-
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|-
 
|-
 
| 00:40
 
| 00:40
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| It is automatically called when an object is created.
+
| It is automatically called when an '''object''' is created.
  
 
|-
 
|-
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|-
 
|-
 
| 00:46
 
| 00:46
−
| '''Parameterized Constructors.'''
+
|* '''Parameterized Constructors.'''
  
 
|-
 
|-
 
| 00:49
 
| 00:49
−
| '''Copy Constructors.'''
+
|* '''Copy Constructors.'''and
  
 
|-
 
|-
 
| 00:50
 
| 00:50
−
| And '''Default Constructors.'''
+
|* '''Default Constructors.'''
  
 
|-
 
|-
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|-
 
|-
 
| 01:07  
 
| 01:07  
−
| Let us see an example on '''Constructors''' and '''Destructors''',
+
| Let us see an example on '''Constructors''' and '''Destructors'''.
  
 
|-
 
|-
 
| 01:11
 
| 01:11
−
| I have already typed the code on the editor, I will open it.
+
| I have already typed the code on the '''editor''', I will open it.
  
 
|-
 
|-
 
| 01:15
 
| 01:15
−
| Note that our filename is '''cons hyphen dest dot cpp'''
+
| Note that our filename is '''cons hyphen dest dot cpp'''.
  
 
|-
 
|-
 
| 01:20
 
| 01:20
−
| In this program we will perform the addition of two numbers using '''constructor.'''
+
| In this program, we will perform the addition of two numbers using '''constructor.'''
  
 
|-
 
|-
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|-
 
|-
 
| 01:33
 
| 01:33
−
| Then we have class '''Addition'''. '''a''' and '''b''' are the integer variables.
+
| Then we have class '''Addition'''. 'a' and 'b' are the '''integer variables'''.
  
 
|-
 
|-
 
| 01:38
 
| 01:38
−
|These are the private members of class '''Addition.'''
+
|These are the '''private''' members of class '''Addition.'''
  
 
|-
 
|-
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|-
 
|-
 
| 01:44
 
| 01:44
−
| Then we have the '''construtor''' '''Addition'''
+
| Then we have the '''construtor''' '''Addition'''.
  
 
|-
 
|-
 
| 01:47
 
| 01:47
−
| The '''constructor''' has the same name as the class name.
+
| The '''constructor''' has the same name as the '''class''' name.
  
 
|-
 
|-
 
| 01:52
 
| 01:52
−
| We have passed two arguements here.
+
| We have passed two '''arguement'''s here.
  
 
|-
 
|-
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|-
 
|-
 
| 01:57
 
| 01:57
−
| For this we use a '''tilde''' sign followed by the '''destructors''' name.
+
| For this we use a '''tilde''' sign followed by the '''destructor's''' name.
  
 
|-
 
|-
 
| 02:02
 
| 02:02
−
| This is a public function '''add.'''
+
| This is a '''public''' function '''add.'''
  
 
|-
 
|-
 
| 02:05
 
| 02:05
−
| It returns sum of a and b.  
+
| It returns sum of 'a' and 'b'.  
  
 
|-
 
|-
 
| 02:08
 
| 02:08
−
| Here we access the constructor using the '''scope resolution operator.'''
+
| Here, we access the '''constructor''' using the '''scope resolution operator.'''
  
 
|-
 
|-
 
| 02:12
 
| 02:12
−
| a and b are private members.
+
| 'a' and 'b' are '''private''' members.
  
 
|-
 
|-
 
| 02:15
 
| 02:15
−
| To access the private members we use x and y.
+
| To access the private members, we use 'x' and 'y'.
  
 
|-
 
|-
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|-
 
|-
 
| 02:21
 
| 02:21
−
| In this we print '''Memory Deallocation.'''
+
| In this, we print '''Memory Deallocation.'''
  
 
|-
 
|-
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|-
 
|-
 
| 02:28
 
| 02:28
−
| Here we create an object '''obj''' of class '''Addition'''.  
+
| Here, we create an object '''obj''' of '''class''' '''Addition'''.  
  
 
|-
 
|-
 
| 02:32
 
| 02:32
−
| Then we pass two arguments as '''3''' and '''4'''.
+
| Then we pass two '''argument'''s as '''3''' and '''4'''.
  
 
|-
 
|-
 
| 02:36
 
| 02:36
−
| '''3''' will be stored in '''x''' and '''4''' will be stored in '''y'''.
+
| '''3''' will be stored in 'x' and '''4''' will be stored in 'y'.
  
 
|-
 
|-
 
| 02:40
 
| 02:40
−
| This means '''a's''' value is '''3 '''and '''b's'''value is '''4.'''
+
| This means 'a's value is '''3 '''and 'b's value is '''4.'''
  
 
|-
 
|-
 
| 02:45
 
| 02:45
−
| The constructor that has arguments is called '''parameterized constructor.'''
+
| The '''constructor''' that has '''argument'''s is called '''parameterized constructor.'''
  
 
|-
 
|-
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|-
 
|-
 
| 02:53
 
| 02:53
−
| Here we call the function '''add '''using the object''' obj'''.
+
| Here, we call the function '''add '''using the object''' obj'''.
  
 
|-
 
|-
 
| 02:58
 
| 02:58
−
|And we print the sum.  
+
|And we '''print''' the sum.  
  
 
|-
 
|-
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|-
 
|-
 
| 03:02
 
| 03:02
−
| Now let us execute the program.
+
| Now let us '''execute''' the program.
  
 
|-
 
|-
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|-
 
|-
 
| 03:12
 
| 03:12
−
| To compile type, '''g++ space cons hyphen dest dot cpp space hyphen o space cons'''
+
| To compile, type: '''g++ space cons hyphen dest dot cpp space hyphen o space cons'''
  
 
|-
 
|-
 
| 03:21
 
| 03:21
−
| '''Press Enter'''  
+
| '''Press Enter'''.
  
 
|-
 
|-
 
| 03:23
 
| 03:23
−
| Type '''dot slash cons'''
+
| Type: '''dot slash cons'''
  
 
|-
 
|-
 
| 03:25
 
| 03:25
−
| Press '''Enter'''
+
| Press '''Enter'''.
  
 
|-
 
|-
 
| 03:27
 
| 03:27
−
| The output is displayed as  
+
| The output is displayed as:
  
 
|-
 
|-
 
| 03:29
 
| 03:29
−
| '''Sum is 7''' and '''Memory Deallocation'''
+
| '''Sum is 7''' and '''Memory Deallocation'''.
  
 
|-
 
|-
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|-
 
|-
 
| 03:37
 
| 03:37
−
| Come back ot our program.
+
| Come back to our program.
  
 
|-
 
|-
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|-
 
|-
 
| 03:48
 
| 03:48
−
| Then the '''compiler''' assumes a '''default constructor''' for the class.
+
| then the '''compiler''' assumes a '''default constructor''' for the '''class'''.
  
 
|-
 
|-
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|-
 
|-
 
| 03:55
 
| 03:55
−
| This is our header file as '''iostream.'''
+
| This is our '''header file''' as '''iostream.'''
  
 
|-
 
|-
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|-
 
|-
 
| 04:04
 
| 04:04
−
| Then we have a and b declared as''' public.'''
+
| Then we have 'a' and 'b' declared as''' public.'''
  
 
|-
 
|-
 
| 04:08
 
| 04:08
−
| Here we have '''sub''' function.
+
| Here, we have '''sub''' function.
  
 
|-
 
|-
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|-
 
|-
 
| 04:15
 
| 04:15
−
| This returns the subtraction of two numbers '''a''' and '''b.'''
+
| This returns the subtraction of two numbers 'a' and 'b.'
  
 
|-
 
|-
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|-
 
|-
 
| 04:22
 
| 04:22
−
| Here we access the default constructor using the''' scope resolution operator.'''
+
| Here, we access the default constructor using the''' scope resolution operator.'''
  
 
|-
 
|-
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|-
 
|-
 
| 04:29
 
| 04:29
−
| In this we have defined a variable '''x.'''
+
| In this we have defined a variable 'x.'
  
 
|-
 
|-
 
| 04:34
 
| 04:34
−
| Here we create an '''object''' '''s''' of class '''subtraction.'''
+
| Here we create an '''object''' 's' of class '''subtraction.'''
  
 
|-
 
|-
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|-
 
|-
 
| 04:47
 
| 04:47
−
| Then the result is stored in variable''' x.'''
+
| Then the result is stored in variable' x.'
  
 
|-
 
|-
 
| 04:51
 
| 04:51
−
| And here we print the difference.
+
| And here we '''print''' the difference.
  
 
|-
 
|-
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|-
 
|-
 
| 04:56
 
| 04:56
−
| Now let us execute the program.
+
| Now, let us '''execute''' the program.
  
 
|-
 
|-
 
| 04:58
 
| 04:58
−
| Come back to our terminal.
+
| Come back to our '''terminal'''.
  
 
|-
 
|-
 
| 05:01
 
| 05:01
−
| Let us compile type '''g++ space default dot cpp space hyphen o space def'''
+
| Let us compile, type: '''g++ space default dot cpp space hyphen o space def'''
  
 
|-
 
|-
 
| 05:09
 
| 05:09
−
| '''Press Enter'''
+
| '''Press Enter'''.
  
 
|-
 
|-
 
| 05:10
 
| 05:10
−
| Type '''dot slash def'''
+
| Type: '''dot slash def'''
  
 
|-
 
|-
 
| 05:12
 
| 05:12
−
| '''Press Enter'''
+
| '''Press Enter'''.
  
 
|-
 
|-
 
| 05:14
 
| 05:14
−
| The output is return as
+
| The output is returned as:
  
 
|-
 
|-
 
| 05:16
 
| 05:16
−
| '''Difference is 4'''
+
| '''Difference is 4'''.
  
 
|-
 
|-
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|-
 
|-
 
| 05:20
 
| 05:20
−
| Here you can see that we have passed the arguments within the function.
+
| Here you can see that we have passed the '''argument'''s within the '''function'''.
  
 
|-
 
|-
 
| 05:25
 
| 05:25
−
| And in our previous example we have passed the arguments within the '''Object.'''
+
| And in our previous example, we have passed the arguments within the '''Object.'''
  
 
|-
 
|-
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|-
 
|-
 
| 05:34
 
| 05:34
−
| Now let us go back to our slides.
+
| Now let us go back to our '''slide'''s.
  
 
|-
 
|-
 
| 05:38
 
| 05:38
−
| Let us summarize, In this tutorial we learned,
+
| Let us summarize. In this tutorial we learned:
  
 
|-
 
|-
 
| 05:41
 
| 05:41
−
| '''Constructors.''' eg. '''Addition'''
+
|* '''Constructors.''' eg. '''Addition'''
  
 
|-
 
|-
 
| 05:43
 
| 05:43
−
| '''Parameterized Constructor.''' eg. '''Addition obj (3, 4);'''
+
|* '''Parameterized Constructor.''' eg. '''Addition obj (3, 4);'''
  
 
|-
 
|-
 
| 05:48
 
| 05:48
−
| '''Destructors''' eg.''' ~Addition'''
+
|* '''Destructors.''' eg.''' ~Addition'''
  
 
|-
 
|-
 
| 05:52
 
| 05:52
−
| '''Default Constructor.''' eg. '''Subtraction'''
+
|* '''Default Constructor.''' eg. '''Subtraction'''
  
 
|-
 
|-
 
| 05:55
 
| 05:55
−
| As an assignment, Create a class named '''Division.'''
+
| As an assignment, create a '''class''' named '''Division.'''
  
 
|-
 
|-
 
| 05:59
 
| 05:59
−
| Create a constructor for the class.
+
| Create a '''constructor''' for the '''class'''.
  
 
|-
 
|-
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|-
 
|-
 
| 06:06
 
| 06:06
−
| Watch the video available at the link shown below
+
| Watch the video available at the link shown below.
  
 
|-
 
|-
 
| 06:09
 
| 06:09
−
| It summarises the Spoken Tutorial project.
+
| It summarizes the Spoken Tutorial project.
  
 
|-
 
|-
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|-
 
|-
 
| 06:16
 
| 06:16
−
| The Spoken Tutorial Project Team, Conducts workshops using spoken tutorials .
+
| The Spoken Tutorial Project Team, Conducts workshops using spoken tutorials. .
  
 
|-
 
|-
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|-
 
|-
 
| 06:25
 
| 06:25
−
| For more details, please write to,
+
| For more details, please write to:
  
 
|-
 
|-
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|-
 
|-
 
| 06:31
 
| 06:31
−
| 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.
  
 
|-
 
|-
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|-
 
|-
 
| 06:42
 
| 06:42
−
| More information on this Mission is available at the link shown below
+
| More information on this mission is available at the link shown below.
  
 
|-
 
|-
 
|  06:47
 
|  06:47
−
| This is Ashwini Patil from IIT Bombay signing off. Thank You for joining.  
+
| This is Ashwini Patil from IIT Bombay, signing off. Thank You for joining.  
  
 
|}
 
|}

Revision as of 10:37, 27 June 2015

Time Narration
00:01 Welcome to the spoken tutorial on Constructors and Destructors in C++.
00:07 In this tutorial, we will learn:
00:09 * Constructors
00:10 * Types of constructors
00:12 * Destructors.
00:13 We will do this with the help of some examples.
00:17 To record this tutorial, I am using:
00:20 * Ubuntu Operating System version 11.10,
00:23 * g++ Compiler version 4.6.1.
00:28 Let us start with an introduction to Constructors.
00:31 A constructor is a member function.
00:33 It has the same name as the class name.
00:37 Constructors cannot return values.
00:40 It is automatically called when an object is created.
00:44 Types of Constructors :
00:46 * Parameterized Constructors.
00:49 * Copy Constructors.and
00:50 * Default Constructors.
00:53 Let us move on to Destructors.
00:56 Destructors are used to deallocate memory.
00:59 They are called when an object is destroyed.
01:02 A destructor takes no arguments and has no return types.
01:07 Let us see an example on Constructors and Destructors.
01:11 I have already typed the code on the editor, I will open it.
01:15 Note that our filename is cons hyphen dest dot cpp.
01:20 In this program, we will perform the addition of two numbers using constructor.
01:25 Let me explain the code now.
01:27 This is our header file as iostream
01:30 Here we have used std namespace.
01:33 Then we have class Addition. 'a' and 'b' are the integer variables.
01:38 These are the private members of class Addition.
01:42 Here we have the Public specifier.
01:44 Then we have the construtor Addition.
01:47 The constructor has the same name as the class name.
01:52 We have passed two arguements here.
01:54 Now we have defined a Destructor.
01:57 For this we use a tilde sign followed by the destructor's name.
02:02 This is a public function add.
02:05 It returns sum of 'a' and 'b'.
02:08 Here, we access the constructor using the scope resolution operator.
02:12 'a' and 'b' are private members.
02:15 To access the private members, we use 'x' and 'y'.
02:19 Then we access the destructor.
02:21 In this, we print Memory Deallocation.
02:25 This is our main function.
02:28 Here, we create an object obj of class Addition.
02:32 Then we pass two arguments as 3 and 4.
02:36 3 will be stored in 'x' and 4 will be stored in 'y'.
02:40 This means 'a's value is 3 and 'b's value is 4.
02:45 The constructor that has arguments is called parameterized constructor.
02:50 Hence this one is the prameterized constructor.
02:53 Here, we call the function add using the object obj.
02:58 And we print the sum.
03:00 This is our return statement.
03:02 Now let us execute the program.
03:05 Open the terminal window by pressing Ctrl, Alt and T keys simultaneously on your keyboard.
03:12 To compile, type: g++ space cons hyphen dest dot cpp space hyphen o space cons
03:21 Press Enter.
03:23 Type: dot slash cons
03:25 Press Enter.
03:27 The output is displayed as:
03:29 Sum is 7 and Memory Deallocation.
03:33 Now let us see an example on Default constructors.
03:37 Come back to our program.
03:39 I have already typed the code.
03:41 Note that our filename is default dot cpp
03:45 If a constructor is not declared in the class,
03:48 then the compiler assumes a default constructor for the class.
03:53 Let me explain the code.
03:55 This is our header file as iostream.
03:58 Here we have used std namespace.
04:02 Then we have class Subtraction.
04:04 Then we have 'a' and 'b' declared as public.
04:08 Here, we have sub function.
04:10 We have passed two arguments int a and int b.
04:15 This returns the subtraction of two numbers 'a' and 'b.'
04:19 This is the defalut constructor.
04:22 Here, we access the default constructor using the scope resolution operator.
04:27 This is our main function.
04:29 In this we have defined a variable 'x.'
04:34 Here we create an object 's' of class subtraction.
04:39 Then we call the function sub using the object s.
04:42 And pass two arguments as 8 and 4.
04:47 Then the result is stored in variable' x.'
04:51 And here we print the difference.
04:54 This is our return statement.
04:56 Now, let us execute the program.
04:58 Come back to our terminal.
05:01 Let us compile, type: g++ space default dot cpp space hyphen o space def
05:09 Press Enter.
05:10 Type: dot slash def
05:12 Press Enter.
05:14 The output is returned as:
05:16 Difference is 4.
05:18 Come back to our program.
05:20 Here you can see that we have passed the arguments within the function.
05:25 And in our previous example, we have passed the arguments within the Object.
05:30 And here we have passed the arguments using the Object.
05:34 Now let us go back to our slides.
05:38 Let us summarize. In this tutorial we learned:
05:41 * Constructors. eg. Addition
05:43 * Parameterized Constructor. eg. Addition obj (3, 4);
05:48 * Destructors. eg. ~Addition
05:52 * Default Constructor. eg. Subtraction
05:55 As an assignment, create a class named Division.
05:59 Create a constructor for the class.
06:01 And Create a function divide which divides two given numbers.
06:06 Watch the video available at the link shown below.
06:09 It summarizes the Spoken Tutorial project.
06:11 If you do not have good bandwidth, you can download and watch it.
06:16 The Spoken Tutorial Project Team, Conducts workshops using spoken tutorials. .
06:21 Gives certificates to those who pass an online test .
06:25 For more details, please write to:
06:27 contact@spoken hyphen tutorial dot org
06:31 Spoken Tutorial Project is a part of the "Talk to a Teacher" project.
06:36 It is supported by the National Mission on Education through ICT, MHRD, Government of India.
06:42 More information on this mission is available at the link shown below.
06:47 This is Ashwini Patil from IIT Bombay, signing off. Thank You for joining.

Contributors and Content Editors

Gaurav, PoojaMoolya, Pratik kamble, Sandhya.np14

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