Difference between revisions of "Advanced-C++/C2/Polymorphism/English-timed"

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|-
 
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|  00:02
 
|  00:02
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|  Welcome to the spoken tutorial on '''Polymorphism'''in '''C++'''.
+
|  Welcome to the '''spoken tutorial''' on '''Polymorphism'''in '''C++'''.
  
 
|-
 
|-
 
|  00:07
 
|  00:07
−
|  In this tutorial we will learn,
+
|  In this tutorial, we will learn:
  
 
|-
 
|-
 
|  00:10
 
|  00:10
−
| '''Polymorphism.'''
+
|* '''Polymorphism'''
  
 
|-
 
|-
 
|  00:11
 
|  00:11
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| '''Virtual Function.'''
+
|* '''Virtual Function.'''
  
 
|-
 
|-
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|-
 
|-
 
|  00:16
 
|  00:16
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|  To record this tutorial, I am using '''Ubuntu OS '''version 11.10 '''g++ compiler '''v. 4.6.1'''
+
|  To record this tutorial, I am using:
 +
* '''Ubuntu OS '''version '''11.10'''
 +
* '''g++ compiler '''version 4.6.1'''
  
 
|-
 
|-
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|-
 
|-
 
|00:36   
 
|00:36   
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| It is the mechanism to use a '''function with same name''' in different ways.
+
| It is the mechanism to use a '''function''' with same name in different ways.
  
 
|-
 
|-
 
|  00:42
 
|  00:42
−
|  Let us see virtual functions.
+
|  Let us see '''virtual functions'''.
  
 
|-
 
|-
 
|  00:45
 
|  00:45
−
| '''Virtual''' function is the member function of a class.  
+
| '''Virtual''' function is the member function of a '''class'''.  
  
 
|-
 
|-
 
|  00:49
 
|  00:49
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| It can be overriden in its '''derived class.'''
+
| It can be overridden in its '''derived class.'''
  
 
|-
 
|-
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|-
 
|-
 
|  01:06
 
|  01:06
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| I have already written the code.
+
| I have already written the '''code'''.
  
 
|-
 
|-
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|-
 
|-
 
|  01:10
 
|  01:10
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| Note that our filename is '''virtual.cpp'''
+
| Note that our file name is '''virtual.cpp'''.
  
 
|-
 
|-
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|-
 
|-
 
|  01:22
 
|  01:22
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|  This is our header file as '''iostream.'''
+
|  This is our '''header file''' as '''iostream.'''
  
 
|-
 
|-
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|-
 
|-
 
|  01:35
 
|  01:35
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| In this we have declared''' integer variables''' as '''width,height''' and '''ar.'''
+
| In this, we have declared''' integer variables''' as '''width,height''' and '''ar.'''
  
 
|-
 
|-
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|-
 
|-
 
|  01:45
 
|  01:45
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|  Then we have function '''set_values''' declared as '''public.'''
+
|  Then we have function '''set_values()''', declared as '''public.'''
  
 
|-
 
|-
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|-
 
|-
 
|  01:55
 
|  01:55
−
| Then we access the protected members using the public members.
+
| Then we access the '''protected''' members using the '''public members'''.
  
 
|-
 
|-
 
|  02:00
 
|  02:00
−
| This is our '''virtual function area.'''
+
| This is our '''virtual function "area".'''
  
 
|-
 
|-
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|-
 
|-
 
|  02:07
 
|  02:07
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|  Then we have class '''Rectangle''' as a '''derived class.'''
+
|  Then we have '''class''' '''Rectangle''' as a '''derived class.'''
  
 
|-
 
|-
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|-
 
|-
 
|  02:17
 
|  02:17
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|  Here we override the function '''area'''.
+
|  Here we '''override''' the function '''area'''.
  
 
|-
 
|-
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|-
 
|-
 
|  02:23
 
|  02:23
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| And print the value.
+
| And '''print''' the '''value'''.
  
 
|-
 
|-
 
|  02:25
 
|  02:25
−
|  Here we have another derived class as '''triangle'''.
+
|  Here we have another derived '''class''' as '''triangle'''.
  
 
|-
 
|-
 
|  02:29
 
|  02:29
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| This also inherits the properties of the base class '''parallelogram'''.
+
| This also inherits the properties of the '''base class''' '''parallelogram'''.
  
 
|-
 
|-
 
|  02:35
 
|  02:35
−
| Here again we override the function '''area'''.
+
| Here again we '''override''' the function '''area'''.
 
   
 
   
 
|-
 
|-
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|-
 
|-
 
|  02:41
 
|  02:41
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| And print the value.
+
| And '''print''' the '''value'''.
  
 
|-
 
|-
 
|  02:43
 
|  02:43
−
| This is our '''main function.'''
+
| This is our '''main()''' function.
  
 
|-
 
|-
 
|  02:46
 
|  02:46
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|  Here we create an '''object'''of '''class parallelogram as p.'''
+
|  Here we create an '''object'''of '''class parallelogram''' as '''p.'''
  
 
|-
 
|-
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|-
 
|-
 
|  03:03
 
|  03:03
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| '''Pointer''' of base class can point to the object of the derived class.
+
| '''Pointer''' of '''base class''' can point to the '''object''' of the '''derived class'''.
  
 
|-
 
|-
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|-
 
|-
 
|  03:23
 
|  03:23
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| Then we call''' function area.'''
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| Then we call function '''area().'''
  
 
|-
 
|-
 
| 03:26
 
| 03:26
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|  Here, '''Parallel''' is assigned to the address of '''rect'''
+
|  Here, '''Parallel''' is assigned to the address of '''rect'''.
  
 
|-
 
|-
 
|  03:30
 
|  03:30
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| '''rect''' is the object of class '''Rectangle.'''
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| '''rect''' is the '''object''' of '''class''' '''Rectangle.'''
  
 
|-
 
|-
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|-
 
|-
 
|  03:37
 
|  03:37
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| And we call the''' function area.'''
+
| And we call the function '''area().'''
  
 
|-
 
|-
 
|  03:40
 
|  03:40
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|  And at last we assign '''Parallel''' to the address of '''Triangle '''
+
|  And, at last we assign '''Parallel''' to the address of '''Triangle '''
  
 
|-
 
|-
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|-
 
|-
 
|  03:51
 
|  03:51
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| Here we pass '''arguments '''as''' 6 '''and''' 5.'''
+
| Here, we pass '''arguments '''as''' 6 '''and''' 5'''
  
 
|-
 
|-
 
|  03:54
 
|  03:54
−
| And call''' function area.'''
+
| and call''' function area().'''
  
 
|-
 
|-
 
| 03:56
 
| 03:56
−
| And This is our '''return''' statement
+
| And this is our '''return''' statement.
  
 
|-
 
|-
 
| 03:59
 
| 03:59
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| Now  let us execute the program
+
| Now, let us '''execute''' the program.
  
 
|-
 
|-
 
|  04:02
 
|  04:02
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|  Open the terminal window by pressing '''Ctrl, Alt and T '''keys simultaneously on your keyboard.
+
|  Open the '''terminal window''' by pressing '''Ctrl, Alt''' and '''T '''keys simultaneously on your keyboard.
  
 
|-
 
|-
 
|  04:09
 
|  04:09
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|  To compile type:  
+
|  To compile, type:  
  
 
|-
 
|-
 
|  04:10
 
|  04:10
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| '''g++ space virtual.cpp space -o space vir'''. Press '''Enter'''
+
| '''g++ space virtual.cpp space -o space vir''' press '''Enter'''.
  
 
|-
 
|-
 
|  04:20
 
|  04:20
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| Type: '''./vir ''' '''Press Enter'''
+
| Type: '''./vir ''' press '''Enter'''.
  
 
|-
 
|-
 
| 04:24
 
| 04:24
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| You can see that, The output is displayed as:
+
| You can see that the '''output''' is displayed as:
  
 
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|-
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|  04:31
 
|  04:31
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| and '''Area of triangle is 15'''
+
| and '''Area of triangle is 15'''.
  
 
|-
 
|-
 
| 04:34
 
| 04:34
−
|  Come back to  our slides.
+
|  Come back to  our '''slides'''.
  
 
|-
 
|-
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|-
 
|-
 
|  04:37
 
|  04:37
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|  In this tutorial, we  learnt
+
|  In this tutorial, we  learnt:
  
 
|-
 
|-
 
|  04:39
 
|  04:39
−
| '''Polymorphism.'''
+
|* '''Polymorphism'''
  
 
|-
 
|-
 
|  04:41
 
|  04:41
−
| Virtual function example '''Virtual int area'''
+
|* Virtual function, example '''Virtual int area()'''.
  
 
|-
 
|-
 
|  04:45
 
|  04:45
−
|  As an assignment  
+
|  As an assignment:
  
 
|-
 
|-
 
|  04:46
 
|  04:46
−
| Calculate the perimeter of rectangle, square and triangle.
+
|* Calculate the perimeter of rectangle, square and triangle.
  
 
|-
 
|-
 
|  04:50
 
|  04:50
−
| Create perimeter as a '''Virtual function.'''
+
|* Create perimeter as a '''Virtual function.'''
  
 
|-
 
|-
 
|  04:54
 
|  04:54
−
| Watch the video available at the link shown  below
+
| Watch the video available at the link shown  below.
  
 
|-
 
|-
 
|  04:57
 
|  04:57
−
| It summarizes the Spoken Tutorial project  
+
| It summarizes the Spoken-Tutorial project.
  
 
|-
 
|-
 
|  05:00
 
|  05:00
−
| If you do not have good bandwidth, you can download and watch it
+
| If you do not have good bandwidth, you can download and watch it.
  
 
|-
 
|-
 
| 05:04
 
| 05:04
−
|  The Spoken Tutorial Project Team
+
|  The Spoken Tutorial Project team:
  
 
|-
 
|-
 
|  05:06
 
|  05:06
−
| Conducts workshops using spoken tutorials  
+
| Conducts workshops using spoken tutorials.
  
 
|-
 
|-
 
|  05:09
 
|  05:09
−
| Gives certificates to those who pass an Online test  
+
| Gives certificates to those who pass an Online test.
  
 
|-
 
|-
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|-
 
|-
 
|  05:21
 
|  05:21
−
| 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.
  
 
|-
 
|-
 
| 05:25  
 
| 05:25  
−
| It is supported by the National Mission on Education through ICT, MHRD, Government of India
+
| It is supported by the National Mission on Education through ICT, MHRD, Government of India.
  
 
|-
 
|-
 
|  05:32
 
|  05:32
−
| More information on this Mission is available at link shown below : [http://spoken-tutorial.org/NMEICT-Intro http://spoken-tutorial.org\NMEICT-Intro]
+
| More information on this mission is available at link shown below : [http://spoken-tutorial.org/NMEICT-Intro]
  
 
|-
 
|-
 
|05:37
 
|05:37
−
|This is Ashwini Patil from IIT Bombay signing off
+
|This is Ashwini Patil from IIT Bombay, signing off.
−
Thank You for joining.  
+
Thank You for joining.  
  
 
|}
 
|}

Revision as of 23:10, 28 June 2015

Time Narration
00:02 Welcome to the spoken tutorial on Polymorphismin C++.
00:07 In this tutorial, we will learn:
00:10 * Polymorphism
00:11 * Virtual Function.
00:13 We will do this through an example.
00:16 To record this tutorial, I am using:
  • Ubuntu OS version 11.10
  • g++ compiler version 4.6.1
00:27 Let us start with the introduction to polymorphism.
00:31 Polymorphism is the ability to take different forms.
00:36 It is the mechanism to use a function with same name in different ways.
00:42 Let us see virtual functions.
00:45 Virtual function is the member function of a class.
00:49 It can be overridden in its derived class.
00:53 It is declared with virtual keyword.
00:57 Virtual function call is resolved at run-time.
01:01 Now let us see an example on virtual functions.
01:06 I have already written the code.
01:08 Let us go through it.
01:10 Note that our file name is virtual.cpp.
01:15 In this program:
01:16 We will calculate the area of a rectangle, parallelogram and triangle.
01:22 This is our header file as iostream.
01:25 Here we are using std namespace.
01:29 Then we have a class parallelogram
01:33 This is the base class.
01:35 In this, we have declared integer variables as width,height and ar.
01:42 These are declared protected.
01:45 Then we have function set_values(), declared as public.
01:50 Here we have passed two arguments as a and b.
01:55 Then we access the protected members using the public members.
02:00 This is our virtual function "area".
02:04 Here we calculate the area of parallelogram.
02:07 Then we have class Rectangle as a derived class.
02:12 It inherits the properties of base class parallelogram.
02:17 Here we override the function area.
02:21 Then we calculate the area of the rectangle.
02:23 And print the value.
02:25 Here we have another derived class as triangle.
02:29 This also inherits the properties of the base class parallelogram.
02:35 Here again we override the function area.
02:39 Then we calculate the area of the triangle.
02:41 And print the value.
02:43 This is our main() function.
02:46 Here we create an objectof class parallelogram as p.
02:52 We can see here pointer parallel.
02:56 This is the pointer of class parallelogram.
03:00 This is called as Base pointer.
03:03 Pointer of base class can point to the object of the derived class.
03:08 Here we create objects of class Rectangle and Triangle.
03:14 Here, Parallel is assigned to the address of p.
03:18 Then we pass arguments as 3 and 2.
03:23 Then we call function area().
03:26 Here, Parallel is assigned to the address of rect.
03:30 rect is the object of class Rectangle.
03:33 Again we pass arguments as 4 and 5.
03:37 And we call the function area().
03:40 And, at last we assign Parallel to the address of Triangle
03:45 trgl.
03:47 This is the object of class Triangle.
03:51 Here, we pass arguments as 6 and 5
03:54 and call function area().
03:56 And this is our return statement.
03:59 Now, let us execute the program.
04:02 Open the terminal window by pressing Ctrl, Alt and T keys simultaneously on your keyboard.
04:09 To compile, type:
04:10 g++ space virtual.cpp space -o space vir press Enter.
04:20 Type: ./vir press Enter.
04:24 You can see that the output is displayed as:
04:27 Area of parallelogram is 6
04:29 Area of rectangle is 20
04:31 and Area of triangle is 15.
04:34 Come back to our slides.
04:36 Let us summarize.
04:37 In this tutorial, we learnt:
04:39 * Polymorphism
04:41 * Virtual function, example Virtual int area().
04:45 As an assignment:
04:46 * Calculate the perimeter of rectangle, square and triangle.
04:50 * Create perimeter as a Virtual function.
04:54 Watch the video available at the link shown below.
04:57 It summarizes the Spoken-Tutorial project.
05:00 If you do not have good bandwidth, you can download and watch it.
05:04 The Spoken Tutorial Project team:
05:06 Conducts workshops using spoken tutorials.
05:09 Gives certificates to those who pass an Online test.
05:14 For more details, please write to, contact@spoken-tutorial.org
05:21 Spoken-Tutorial Project is a part of the "Talk to a Teacher" project.
05:25 It is supported by the National Mission on Education through ICT, MHRD, Government of India.
05:32 More information on this mission is available at link shown below : [1]
05:37 This is Ashwini Patil from IIT Bombay, signing off.

Thank You for joining.

Contributors and Content Editors

PoojaMoolya, Pratik kamble, Ranjana, Sandhya.np14, Sneha

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