Advanced-C++/C2/Abstract-Class/English-timed - Revision history

Pratik kamble at 09:34, 23 March 2017

2017-03-23T09:34:34Z

Pratik kamble at 09:34, 7 March 2017

2017-03-07T09:34:28Z

Sandhya.np14 at 02:01, 29 June 2015

2015-06-29T02:01:42Z

Sandhya.np14 at 01:58, 29 June 2015

2015-06-29T01:58:02Z

Sandhya.np14 at 01:18, 29 June 2015

2015-06-29T01:18:16Z

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PoojaMoolya at 09:34, 9 October 2014

2014-10-09T09:34:26Z

PoojaMoolya at 09:26, 9 October 2014

2014-10-09T09:26:21Z

Gaurav at 07:23, 18 July 2014

2014-07-18T07:23:14Z

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Gaurav: Created page with ' {| border=1 | '''Time''' | '''Narration''' |- | 00.01 | Welcome to the spoken tutorial on '''abstract class''' and '''pure virtual function''' in '''C++.''' |- | 00.08 |In…'

2014-07-16T10:01:35Z

Created page with ' {| border=1 | '''Time''' | '''Narration''' |- | 00.01 | Welcome to the spoken tutorial on '''abstract class''' and '''pure virtual function''' in '''C++.''' |- | 00.08 |In…'

New page

{| border=1
| '''Time'''
| '''Narration'''

|-
| 00.01
| Welcome to the spoken tutorial on '''abstract class''' and '''pure virtual function''' in '''C++.'''

|-
| 00.08
|In this tutorial we will learn,

|-
| 00.10
|*Abstract Classes

|-
| 00.11
|*Pure virtual function

|-
| 00.13
|*We will do this through an example.

|-
| 00.16
| To record this tutorial, I am using

|-
| 00.19
|*'''Ubuntu OS '''version 11.10

|-
| 00.23
|*'''g++ compiler '''v. 4.6.1

|-
| 00.27
| Let us start with an introduction to '''abstract class.'''

|-
| 00.31
|'''Abstract class '''is always a '''base class'''.

|-
| 00.35
|It contains at least one '''pure virtual function.'''

|-
| 00.39
|We cannot create an instance of '''abstract class.'''

|-
| 00.43
| Let us see '''pure virtual function'''.

|-
| 00.45
|A '''pure virtual function''' is a function with no '''body'''.

|-
| 00.49
|It is not defined in the '''base class'''.

|-
| 00.52
|It is declared as:

|-
| 00.54
|'''virtual void virtualfunname()=0;'''

|-
| 01.00
|A '''derived class''' must override the '''function'''.

|-
| 01.04
|Otherwise the '''compiler''' will give an error.

|-
| 01.07
|It is upto a '''derived class''' to implement the '''function'''.

|-
| 01.11
| Let us look at an example

|-
| 01.13
|I have already typed the code on the editor.

|-
| 01.16
|I will open it.

|-
| 01.18
|Note that our filename is '''abstract.cpp'''

|-
| 01.22
|This example involves addition and subtraction of two numbers.

|-
| 01.28
| Let us go through the code.

|-
| 01.30
| This is our header file as '''iostream.'''

|-
| 01.33
| Here are using '''std namespace.'''

|-
| 01.36
| This is declaration for a '''class''' named '''abstractinterface.'''

|-
| 01.41
| Then we have '''public specifier'''.

|-
| 01.44
| In this we have declared a''' virtual function''' named '''"numbers".'''

|-
| 01.49
|It is initialized to '''0.'''

|-
| 01.51
| Then we have a '''non-virtual function'''.

|-
| 01.55
|And two '''integer variables''' as '''a''' and '''b'''.

|-
| 01.59
| Here we access the '''input function.'''

|-
| 02.01
|In this we accept the numbers '''a''' and '''b'''.

|-
| 02.05
| This is a''' derived class''' named''' add.'''

|-
| 02.09
|It inherits the properties of the '''base class "abstractinterface".'''

|-
| 02.14
| Here we override the '''function "numbers"'''.

|-
| 02.18
|In this we perform addition of two numbers '''a '''and''' b.'''

|-
| 02.21
|And store the result in '''integer variable "sum".'''

|-
| 02.25
|Then we print the result.

|-
| 02.27
| Here we have another '''derived class '''as '''sub.'''

|-
| 02.31
|This also inherits the''' base class "abstractinterface".'''

|-
| 02.35
| In this, again, we override the '''function "numbers"'''.

|-
| 02.39
|And here we calculate the difference of two numbers '''a''' and '''b'''.

|-
| 02.43
|Then we print the difference.

|-
| 02.45
| This is our '''main function.'''

|-
| 02.48
| Here we create an '''object''' of '''class "add"''' as '''obj1.'''

|-
| 02.53
|Then we call both the '''functions "input" '''and''' "numbers" '''using the '''object obj1.'''

|-
| 02.59
| Then we create another '''object''' of '''class "sub"''' as '''obj2.'''

|-
| 03.04
|Again, we call the two "functions''' using the '''object obj2.'''

|-
| 03.08
| And this is our '''return statement'''.

|-
| 03.10
| Now let us execute the program.

|-
| 03.13
| Open the '''terminal window''' by pressing '''Ctrl, Alt and T '''keys simultaneously on your keyboard.

|-
| 03.21
| To compile, type:
'''g++ space abstract dot cpp space hypheno space abs'''

|-
| 03.31
|'''Press Enter'''

|-
| 03.32
|Type:
'''dot slash abs'''

|-
| 03.34
|'''Press Enter'''

|-
| 03.36
| It is displayed as
'''Enter the numbers'''

|-
| 03.38
|I will enter as '''9''' and '''4.'''

|-
| 03.42
|The output is displayed as '''Sum is 13'''

|-
| 03.46
|Again we see '''Enter the numbers'''.

|-
| 03.49
|I will enter as '''8''' and '''3'''.

|-
| 03.52
|The output is displayed as '''Diff is 5'''

|-
| 03.56
| This brings us to the end of this tutorial.

|-
| 03.59
|Come back to our slides.

|-
| 04.01
| Let us summarize.

|-
| 04.03
|In this tutorial we learnt,

|-
| 04.04
|'''Abstract class''' '''eg. class abstractinterface'''

|-
| 04.09
|'''Pure virtual function''' '''eg. virtual void numbers()=0;'''

|-
| 04.14
| As an assignment
*Create an abstract class '''student.'''

|-
| 04.17
|*Create a pure virtual function as '''Info'''

|-
| 04.20
|*Accept the '''name''' and '''roll no''' of the student in the function.

|-
| 04.25
|*Create two derived class '''marks''' and '''sports'''.

|-
| 04.29
|*In marks, accept marks of three subjects.

|-
| 04.32
|*In sports, enter marks scored in '''sports.'''

|-
| 04.35
|*Calculate the '''total marks.'''

|-
| 04.38
|*Then create another derived class as '''result.'''

|-
| 04.41
|*In this, display the''' name, roll-no, total marks''' of the student.

|-
| 04.47
| Watch the video available at the link shown below

|-
| 04.50
|It summarizes the Spoken Tutorial project

|-
| 04.53
|If you do not have good bandwidth, you can download and watch it

|-
| 04.58
| The Spoken Tutorial Project Team Conducts workshops using spoken tutorials

|-
| 05.03
|Gives certificates to those who pass an online test

|-
| 05.07
|For more details, please write to, contact@spoken-tutorial.org

|-
| 05.14
| Spoken Tutorial Project is a part of the Talk to a Teacher project

|-
| 05.18
|It is supported by the National Mission on Education through ICT, MHRD, Government of India

|-
| 05.25
|More information on this Mission is available at the link shown below: [http://spoken-tutorial.org/NMEICT-Intro http://spoken-tutorial.org\NMEICT-Intro]

|-
| 05.30
| This is Ashwini Patil from IIT Bombay signing off

Thank You for watching.

|}

@@ Line 13: / Line 13: @@
 |-
 | 00:10
-|* Abstract Classes, Pure virtual function.
+| Abstract Classes, Pure virtual function.
 |-
@@ Line 25: / Line 25: @@
 |-
 | 00:19
-|*'''Ubuntu OS '''version '''11.10'''
+|'''Ubuntu OS '''version '''11.10'''
 |-
 | 00:23
-|*'''g++ compiler '''version '''4.6.1'''
+|'''g++ compiler '''version '''4.6.1'''
 |-
@@ Line 282: / Line 282: @@
 |-
 | 04:17
-|* Create a '''pure virtual function''' as '''Info'''.
+|Create a '''pure virtual function''' as '''Info'''.
 |-
 | 04:20
-|* Accept the '''name''' and '''roll no''' of the student in the function.
+|Accept the '''name''' and '''roll no''' of the student in the function.
 |-
 | 04:25
-|* Create two '''derived class'''es '''marks''' and '''sports'''.
+|Create two '''derived class'''es '''marks''' and '''sports'''.
 |-
 | 04:29
-|* In marks, accept marks of three subjects.
+|In marks, accept marks of three subjects.
 |-
 | 04:32
-|* In sports, enter marks scored in '''sports.'''
+|In sports, enter marks scored in '''sports.'''
 |-
 | 04:35
-|* Calculate the '''total marks.'''
+|Calculate the '''total marks.'''
 |-
 | 04:38
-|* Then create another '''derived class''' as '''result.'''
+|Then create another '''derived class''' as '''result.'''
 |-
 | 04:41
-|* In this, display the''' name, roll-no''' and '''total marks''' of the student.
+|In this, display the''' name, roll-no''' and '''total marks''' of the student.
 |-

@@ Line 1: / Line 1: @@
 {| border=1
 | '''Time'''
@@ Line 15: / Line 13: @@
 |-
 | 00:10
-|* Abstract Classes
+|* Abstract Classes, Pure virtual function.
-−
-|-
-| 00:11
-|* Pure virtual function.
 |-
@@ Line 232: / Line 226: @@
 |-
 | 03:31
-|press '''Enter'''.
+|press '''Enter'''.Type: '''dot slash abs'''
-−
-|-
-| 03:32
-|Type: '''dot slash abs'''
 |-
@@ Line 267: / Line 257: @@
 |-
-| 03:56
+|03:56
-| This brings us to the end of this tutorial.
+|This brings us to the end of this tutorial.
 |-
@@ Line 280: / Line 270: @@
 |-
 | 04:03
-|In this tutorial, we learnt:
+|In this tutorial, we learnt:'''Abstract class''' e.g. '''class abstractinterface'''.
-−
-|-
-| 04:04
-|'''Abstract class''' e.g. '''class abstractinterface'''.
 |-
@@ Line 292: / Line 278: @@
 |-
 | 04:14
-|  As an assignment-
+|  As an assignment- Create an '''abstract class''' '''student.'''
-* Create an '''abstract class''' '''student.'''
 |-
@@ Line 341: / Line 326: @@
 |-
 | 04:58
-|  The Spoken Tutorial Project team: Conducts workshops using spoken tutorials.
+|The Spoken Tutorial Project team: Conducts workshops using spoken tutorials.
 |-
@@ Line 353: / Line 338: @@
 |-
 | 05:14
-|  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 365: / Line 350: @@
 |-
 | 05:30
-|  This is Ashwini Patil from IIT Bombay, signing off.
+|This is Ashwini Patil from IIT Bombay, signing off.Thank You for watching.
 Thank You for watching.
 |}

@@ Line 15: / Line 15: @@
 |-
 | 00:10
-|*Abstract Classes
+|* Abstract Classes
 |-
 | 00:11
-|*Pure virtual function.
+|* Pure virtual function.
 |-
@@ Line 228: / Line 228: @@
 | 03:21
 |  To compile, type:
- '''g++ space abstract dot cpp space hyphen o space abs'''
+'''g++ space abstract dot cpp space hyphen o space abs'''
 |-
@@ Line 244: / Line 244: @@
 |-
 | 03:36
-|  It is displayed as  '''Enter the numbers'''
+|  It is displayed as  '''Enter the numbers'''.
 |-

@@ Line 11: / Line 11: @@
 |-
 | 00:08
-|In this tutorial we will learn:
+|In this tutorial, we will learn:
 |-
@@ Line 35: / Line 35: @@
 |-
 | 00:23
-|*'''g++ compiler '''version '''4.6.1'''.
+|*'''g++ compiler '''version '''4.6.1'''
 |-
@@ Line 51: / Line 51: @@
 |-
 | 00:39
-|We cannot create an instance of '''abstract class.'''
+|We cannot create an '''instance''' of '''abstract class.'''
 |-
@@ Line 79: / Line 79: @@
 |-
 | 01:04
-|Otherwise the '''compiler''' will give an error.
+|Otherwise the '''compiler''' will give an '''error'''.
 |-
@@ Line 115: / Line 115: @@
 |-
 | 01:33
-|  Here we are using '''std namespace.'''
+|  Here we are using the '''std namespace.'''
 |-
@@ Line 183: / Line 183: @@
 |-
 |  02:35
-| In this, again, we override the function '''numbers()'''.
+| In this, again we override the function '''numbers()'''.
 |-
@@ Line 252: / Line 252: @@
 |-
 | 03:42
-|The output is displayed as '''Sum is 13'''.
+|The '''output''' is displayed as '''Sum is 13'''.
 |-
@@ Line 264: / Line 264: @@
 |-
 | 03:52
-|The output is displayed as '''Diff is 5'''.
+|The '''output''' is displayed as '''diff is 5'''.
 |-
@@ Line 284: / Line 284: @@
 |-
 | 04:04
-|'''Abstract class''' e.g. '''class abstractinterface'''
+|'''Abstract class''' e.g. '''class abstractinterface'''.
 |-
@@ Line 305: / Line 305: @@
 |-
 | 04:25
-|* Create two '''derived class''' '''marks''' and '''sports'''.
+|* Create two '''derived class'''es '''marks''' and '''sports'''.
 |-
@@ Line 321: / Line 321: @@
 |-
 | 04:38
-|* Then create another derived class as '''result.'''
+|* Then create another '''derived class''' as '''result.'''
 |-
 | 04:41
-|* In this, display the''' name, roll-no, total marks''' of the student.
+|* In this, display the''' name, roll-no''' and '''total marks''' of the student.
 |-
@@ Line 333: / Line 333: @@
 |-
 | 04:50
-|It summarizes the Spoken Tutorial project.
+|It summarizes the Spoken-Tutorial project.
 |-
@@ Line 341: / Line 341: @@
 |-
 | 04:58
-|  The Spoken Tutorial Project Team: Conducts workshops using spoken tutorials.
+|  The Spoken Tutorial Project team: Conducts workshops using spoken tutorials.
 |-
@@ Line 349: / Line 349: @@
 |-
 | 05:07
-|For more details, please write to, contact@spoken-tutorial.org
+|For more details, please write to: contact@spoken-tutorial.org
 |-
 | 05:14
-|  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 361: / Line 361: @@
 |-
 | 05:25
-|More information on this Mission is available at the link shown below: [http://spoken-tutorial.org/NMEICT-Intro]
+|More information on this mission is available at the link shown below: http://spoken-tutorial.org/NMEICT-Intro
 |-

@@ Line 211: / Line 211: @@
 |-
 | 03:04
-|Again, we call the two "functions''' using the '''object obj2.'''
+|Again, we call the two '''functions''' using the '''object obj2.'''
 |-