Difference between revisions of "Advanced-C++/C2/More-On-Inheritance/English-timed"

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|-
 
|-
 
| 00:01
 
| 00:01
| Welcome to the spoken tutorial on '''Multiple''' and '''Hierarchical Inheritance''' in '''C++'''.
+
| Welcome to the '''spoken tutorial''' on '''Multiple''' and '''Hierarchical Inheritance''' in '''C++'''.
  
 
|-
 
|-
 
| 00:07
 
| 00:07
| In this tutorial we will learn,
+
| In this tutorial, we will learn:
  
 
|-
 
|-
 
| 00:09
 
| 00:09
|'''Multiple Inheritance'''.
+
|'''Multiple Inheritance'''
  
 
|-
 
|-
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|-
 
|-
 
| 00:17
 
| 00:17
| To record this tutorial, I am using,
+
| To record this tutorial, I am using:
  
 
|-
 
|-
 
| 00:20
 
| 00:20
| '''Ubuntu OS '''version 11.10 and
+
| '''Ubuntu OS '''version '''11.10''' and
  
 
|-
 
|-
 
| 00:24
 
| 00:24
| '''g++ compiler '''v. 4.6.1
+
| '''g++ compiler '''version '''4.6.1'''
  
 
|-
 
|-
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|-
 
|-
 
| 00:40
 
| 00:40
|I have already typed the code on the editor.
+
|I have already typed the '''code''' on the '''editor'''.
  
 
|-
 
|-
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|-
 
|-
 
| 00:45
 
| 00:45
|Note that our filename is '''multiple.cpp'''
+
|Note that our file name is '''multiple.cpp'''.
  
 
|-
 
|-
 
| 00:49
 
| 00:49
| In this program we will display the '''name, roll no, marks''' and '''average''' of the student.
+
| In this program, we will display the '''name, roll no, marks''' and '''average''' of the student.
  
 
|-
 
|-
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|-
 
|-
 
| 00:59
 
| 00:59
| This is our headerfile as '''iostream'''
+
| This is our '''header file''' as '''iostream'''.
  
 
|-
 
|-
 
| 01:01
 
| 01:01
|  Here we are using the '''std namespace'''
+
|  Here we are using the '''std namespace'''.
  
 
|-  
 
|-  
 
|01:05
 
|01:05
|Then we have '''class "student".'''
+
|Then we have '''class student.'''
  
 
|-
 
|-
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|-
 
|-
 
| 01:09
 
| 01:09
|In this we have '''roll_no''' as '''integer variable''' and '''name '''as''' character variable'''.
+
|In this, we have '''roll_no''' as '''integer variable''' and '''name '''as''' character variable'''.
  
 
|-
 
|-
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|-
 
|-
 
| 01:19
 
| 01:19
|Then we have another '''class "exam_inherit"'''
+
|Then we have another '''class exam_inherit'''.
  
 
|-
 
|-
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|-
 
|-
 
| 01:26
 
| 01:26
| Hence we have two '''base class''' here- ''' student''' and '''exam_inherit.'''
+
| Hence we have two '''base class'''es here- ''' student''' and '''exam_inherit.'''
  
 
|-
 
|-
 
| 01:32
 
| 01:32
|In this we have 3 '''variables'''-  '''sub1, sub2, sub3''' as '''protected'''.
+
|In this, we have 3 '''variables'''-  '''sub1, sub2''' and '''sub3''' as '''protected'''.
  
 
|-
 
|-
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|-
 
|-
 
| 01:44
 
| 01:44
|Now here we have '''class "grade"''' which is the '''derived class'''.
+
|Now, here we have '''class "grade"''' which is the '''derived class'''.
  
 
|-
 
|-
 
| 01:50
 
| 01:50
|This inherits the '''base classes''' – '''class student"' and '''class "exam_inherit"'''.
+
|This inherits the '''base classes''' – '''class "student"' and '''class "exam_inherit". '''
  
 
|-
 
|-
 
| 01:56
 
| 01:56
| In this we have '''avg''' as '''integer variable''' declared as '''private'''.
+
| In this, we have '''avg''' as '''integer variable''' declared as '''private'''.
  
 
|-
 
|-
 
| 02:02
 
| 02:02
| Then we have '''function'''
+
| Then we have '''functions''':
  
 
|-
 
|-
 
| 02:04
 
| 02:04
|'''input()'''
+
|'''input()''''''display()'''
 
+
|-
+
| 02:05
+
|'''display()'''
+
  
 
|-
 
|-
 
| 02:06
 
| 02:06
|'''average()'''
+
|'''average()''''''input_exam()'''
 
+
|-
+
| 02:07
+
|'''input_exam()'''
+
  
 
|-
 
|-
 
| 02:08
 
| 02:08
|'''and display_exam()''' as '''public functions'''.
+
|'''and display_exam()''' as '''public''' functions.
  
 
|-
 
|-
 
| 02:11
 
| 02:11
|In this we have '''"total"''' as '''integer variable''' declared as '''public'''.
+
|In this, we have '''total''' as '''integer variable''' declared as '''public'''.
  
 
|-
 
|-
 
| 02:17
 
| 02:17
| Then we use '''input function''' to accept the '''roll_no''' and '''name''' of the student.
+
| Then, we use '''input()''' function to accept the '''roll_no''' and '''name''' of the student.
  
 
|-
 
|-
 
| 02:24
 
| 02:24
| In''' display function''', we display the '''roll_no''' and '''name '''of the student.
+
| In''' display()''' function, we display the '''roll_no''' and '''name '''of the student.
  
 
|-
 
|-
 
| 02:28
 
| 02:28
| Here we have''' function input_exam.'''
+
| Here, we have function '''input_exam().'''
  
 
|-
 
|-
 
| 02:31
 
| 02:31
|In this we accept the marks of three subjects as '''sub1, sub2 and sub3.'''
+
|In this, we accept the marks of three subjects as '''sub1, sub2''' and '''sub3.'''
  
 
|-
 
|-
 
| 02:37
 
| 02:37
| Then in '''display_exam function''', we calculate the total of three subjects.
+
| Then in '''display_exam()''' function, we calculate the total of three subjects and print the '''total'''.
And print the total.
+
  
 
|-
 
|-
 
| 02:44
 
| 02:44
| And in '''function average''' we calculate the average.
+
| And in function '''average()''', we calculate the average.
  
 
|-
 
|-
 
|02:48
 
|02:48
| This is our '''main function.'''
+
|This is our '''main()''' function.
  
 
|-
 
|-
 
| 02:51
 
| 02:51
|In this we create an''' object '''of '''class grade '''which is the''' derived class '''as''' gd.'''
+
|In this, we create an''' object '''of '''class grade '''which is the''' derived class '''as''' gd'''.
  
 
|-
 
|-
 
| 02:57
 
| 02:57
| Then we call all the above '''functions'''
+
| Then we call all the above '''functions'''.
  
 
|-
 
|-
 
| 03:01
 
| 03:01
| This is our '''return statement'''.
+
| This is our '''return''' statement.
  
 
|-
 
|-
 
| 03:03
 
| 03:03
|Now let us execute the program
+
|Now, let us '''execute''' the program.
  
 
|-
 
|-
 
| 03:05
 
| 03:05
| 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.
  
 
|-
 
|-
 
| 03:14
 
| 03:14
| To compile, type '''g++ space multiple dot cpp space  hyphen o space mult'''. Press '''Enter'''
+
| To compile, type: '''g++ space multiple dot cpp space  hyphen o space mult'''. Press '''Enter'''.
  
 
|-
 
|-
 
| 03:24
 
| 03:24
|Type''' dot slash mult'''. Press '''Enter'''
+
|Type:''' dot slash mult'''. Press '''Enter'''.
  
 
|-
 
|-
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|-
 
|-
 
| 03:32
 
| 03:32
|I will enter as '''3'''
+
|I will enter as '''3'''.
  
 
|-
 
|-
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|-
 
|-
 
| 03:36
 
| 03:36
|I will enter as '''Pratham'''
+
|I will enter as '''Pratham'''.
  
 
|-
 
|-
 
| 03:39
 
| 03:39
|''Enter marks of subject1'''
+
|'''Enter marks of subject1:'''
  
 
|-
 
|-
 
| 03:41  
 
| 03:41  
|I will give as '''67'''
+
|I will give as '''67'''.
  
 
|-
 
|-
 
| 03:43
 
| 03:43
|'''subject2''' as '''78''' and
+
|'''subject2''' as '''78''' and.
  
 
|-
 
|-
 
| 03:46
 
| 03:46
|'''subject3''' as '''84'''
+
|'''subject3''' as '''84'''.
  
 
|-
 
|-
 
|03:48
 
|03:48
|The output is displayed as  
+
|The '''output''' is displayed as:
  
 
|-
 
|-
 
| 03:51
 
| 03:51
|'''Roll no is: 3'''
+
|'''Roll no is: 3''''''Name is: Pratham'''
 
+
|-
+
| 03:52
+
|'''Name is: Pratham'''
+
  
 
|-
 
|-
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|-
 
|-
 
| 03:55
 
| 03:55
|'''Average is: 76'''
+
|'''Average is: 76'''.
  
 
|-
 
|-
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|-
 
|-
 
| 04:00
 
| 04:00
|Now we will see '''hierarchical inheritance'''.
+
|Now, we will see '''hierarchical inheritance'''.
  
 
|-
 
|-
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|-
 
|-
 
| 04:05
 
| 04:05
|In '''hierarchical inheritance,  multiple derived classes''' inherits from one '''base class'''.
+
|In '''hierarchical inheritance,  multiple derived classes''' inherit from one '''base class'''.
  
 
|-
 
|-
 
| 04:12
 
| 04:12
| Note that our filename is '''hierarchical dot cpp'''
+
| Note that our 'file name' is '''hierarchical dot cpp'''.
  
 
|-
 
|-
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|-
 
|-
 
| 04:19
 
| 04:19
| This is our header file as '''iostream.'''
+
| This is our '''header file''' as '''iostream.'''
  
 
|-
 
|-
 
| 04:22
 
| 04:22
| Here we have used the '''std namespace'''
+
| Here we have used the '''std namespace'''.
  
 
|-
 
|-
 
| 04:25
 
| 04:25
| Then we have '''class  student''' which is the '''base class.'''
+
| Then, we have '''class  student''' which is the '''base class.'''
  
 
|-
 
|-
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|-
 
|-
 
| 04:46
 
| 04:46
| Here we have another '''class 'show'.'''
+
| Here, we have another '''class 'show'.'''
  
 
|-
 
|-
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|-
 
|-
 
| 04:54
 
| 04:54
| In this we have two '''functions: "input"''' and '''"display".'''
+
| In this, we have two '''functions: input()''' and '''display().'''
  
 
|-
 
|-
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|-
 
|-
 
|05:02
 
|05:02
|In '''function input''' we accept the '''roll_no''' and '''name''' of the student.
+
|In function '''input()''', we accept the '''roll_no''' and '''name''' of the student.
  
 
|-
 
|-
 
| 05:07
 
| 05:07
| In '''function display''' we display the '''roll_no''' and '''name''' of the student.
+
| In function '''display()''', we display the '''roll_no''' and '''name''' of the student.
  
 
|-
 
|-
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|-
 
|-
 
| 05:19
 
| 05:19
|You can see that there are two '''derived class'''- '''class exam''' and '''class show.'''
+
|You can see that there are two '''derived classes'''- '''class exam''' and '''class show.'''
  
 
|-
 
|-
 
| 05:26
 
| 05:26
|Both the '''classes''' inherits the '''class "student".'''
+
|Both the '''classes''' inherit the '''class "student".'''
  
 
|-
 
|-
 
| 05:30
 
| 05:30
| In '''class exam''' we have two '''functions''' as '''"input_exam"''' and '''"total marks"''' declared as '''public'''.
+
| In '''class exam''', we have two '''functions''' as '''input_exam()''' and '''total_marks()''' declared as '''public'''.
  
 
|-
 
|-
 
| 05:38
 
| 05:38
| Here we access the '''function "input_exam"'''  
+
| Here, we access the function '''input_exam()'''.
  
 
|-
 
|-
 
| 05:41
 
| 05:41
|It accepts the marks of three subjects- '''sub1, sub2 and sub3'''
+
|It accepts the marks of three subjects- '''sub1, sub2''' and '''sub3'''.
  
 
|-
 
|-
 
| 05:46
 
| 05:46
| Then we have ''' "total_marks" function.'''
+
| Then we have ''' total_marks()''' function.
  
 
|-
 
|-
 
| 05:49
 
| 05:49
|It calculates the total of three subjects and print the total.
+
|It calculates the total of three subjects and prints the '''total'''.
  
 
|-
 
|-
 
| 05:53
 
| 05:53
| This is our '''main function'''.
+
| This is our '''main()''' function.
  
 
|-
 
|-
 
| 05:56
 
| 05:56
|In this we create '''objects''' of three '''classes''' as''' st, sw '''and''' em.'''
+
|In this, we create '''objects''' of three '''classes''' as''' st, sw '''and''' em.'''
  
 
|-
 
|-
 
| 06:03
 
| 06:03
| Then we call all the above '''functions.''' using these object.
+
| Then we call all the above '''functions''' using these objects.
  
 
'''sw.input();'''
 
'''sw.input();'''
Line 394: Line 381:
 
|-
 
|-
 
| 06:15
 
| 06:15
| And this is our '''return statement'''.
+
| And this is our '''return''' statement.
  
 
|-
 
|-
 
| 06:17
 
| 06:17
|  Now let us execute the program.
+
|  Now, let us '''execute''' the program.
  
 
|-
 
|-
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|-
 
|-
 
|  06:24
 
|  06:24
|Let us compile, Type '''g++ space  hierarchical dot cpp space  hyphen o space hier'''
+
|Let us compile, type: '''g++ space  hierarchical dot cpp space  hyphen o space hier'''
  
 
|-
 
|-
 
| 06:36
 
| 06:36
|Press '''Enter'''
+
|Press '''Enter'''.Type: '''dot slash hier'''
 
+
|-
+
| 06:37
+
|Type '''dot slash hier'''
+
  
 
|-
 
|-
 
| 06:41
 
| 06:41
|Press '''Enter'''
+
|Press '''Enter'''.
  
 
|-
 
|-
 
| 06:43
 
| 06:43
|'''Enter Roll no.:'''
+
|'''Enter Roll no.:'''I will give as '''4'''.
 
+
|-
+
| 06:44
+
|I will give as '''4'''
+
  
 
|-
 
|-
 
| 06:46
 
| 06:46
|'''Enter Name:'''
+
|'''Enter Name:'''I will give as '''Ashwini'''.
 
+
|-
+
| 06:47
+
|I will give as '''Ashwini'''
+
  
 
|-
 
|-
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|-
 
|-
 
| 06:52
 
| 06:52
|I will give as '''87'''
+
|I will give as '''87'''.
  
 
|-
 
|-
 
| 06:54
 
| 06:54
|'''subject2''' as '''67''' and '''subject3''' as '''97'''
+
|'''subject2''' as '''67''' and '''subject3''' as '''97'''.
  
 
|-
 
|-
 
| 07:00
 
| 07:00
| The output is displayed as
+
| The '''output''' is displayed as:
  
 
|-
 
|-
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|-
 
|-
 
| 07:06
 
| 07:06
|'''Total is : 251'''
+
|'''Total is : 251'''This brings us to the end of this tutorial.
 
+
|-
+
| 07:07
+
This brings us to the end of this tutorial.
+
  
 
|-
 
|-
 
| 07:10
 
| 07:10
|Come back to our slides.
+
|Come back to our '''slides'''.
  
 
|-
 
|-
 
| 07:13
 
| 07:13
| Let us summarize
+
| Let us summarize.In this tutorial, we learnt-
 
+
|-
+
| 07:14
+
|In this tutorial, we learnt,
+
  
 
|-
 
|-
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|-
 
|-
 
| 07:20
 
| 07:20
|As an assignment  
+
|As an assignment: Create a '''class area''' and '''perimeter'''.
 
+
|-
+
| 07:21
+
|Create a '''class area''' and '''perimeter'''.
+
  
 
|-
 
|-
 
| 07:25
 
| 07:25
|Find the '''area''' and '''perimeter''' of '''rectangle'''.
+
|Find the area and perimeter of rectangle.
  
 
|-
 
|-
 
| 07:29
 
| 07:29
|Watch the video available at the link shown below
+
|Watch the video available at the link shown below.
  
 
|-
 
|-
 
| 07:32
 
| 07:32
|It summarizes the Spoken Tutorial project  
+
|It summarizes the Spoken Tutorial project.
  
 
|-
 
|-
 
| 07:35
 
| 07:35
|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.
  
 
|-
 
|-
 
| 07:40
 
| 07:40
|The Spoken Tutorial Project Team  
+
|The Spoken Tutorial Project Team:
  
 
|-
 
|-
 
| 07:42
 
| 07:42
|Conducts workshops using spoken tutorials  
+
|Conducts workshops using spoken tutorials.
  
 
|-
 
|-
 
| 07:45
 
| 07:45
|Gives certificates to those who pass an online test  
+
|Gives certificates to those who pass an online test.
  
 
|-
 
|-
 
| 07:49
 
| 07:49
|For more details, please write to,
+
|For more details, please write to:
  
 
|-
 
|-
Line 538: Line 501:
 
|-
 
|-
 
| 07:56
 
| 07:56
|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.
  
 
|-
 
|-
 
| 08:01
 
| 08:01
|It is supported by the National Mission on Education through ICT, MHRD, Government of India about:startpage
+
|It is supported by the National Mission on Education through ICT, MHRD, Government of India.
  
 
|-
 
|-
 
|08:07
 
|08:07
|More information on this Mission is available at the link shown below.
+
|More information on this mission is available at the link shown below.
 
|-
 
|-
 
|08:11
 
|08:11
| 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.  
  
 
|}
 
|}

Latest revision as of 14:38, 23 March 2017

Time Narration
00:01 Welcome to the spoken tutorial on Multiple and Hierarchical Inheritance in C++.
00:07 In this tutorial, we will learn:
00:09 Multiple Inheritance
00:11 Hierarchical Inheritance.
00:13 We will do this with the help of examples.
00:17 To record this tutorial, I am using:
00:20 Ubuntu OS version 11.10 and
00:24 g++ compiler version 4.6.1
00:29 In multiple inheritance, derived class inherits from more than one base class.
00:36 Now, we will see an example on multiple inheritance.
00:40 I have already typed the code on the editor.
00:42 I will open it.
00:45 Note that our file name is multiple.cpp.
00:49 In this program, we will display the name, roll no, marks and average of the student.
00:56 Let me explain the code.
00:59 This is our header file as iostream.
01:01 Here we are using the std namespace.
01:05 Then we have class student.
01:07 This is the base class.
01:09 In this, we have roll_no as integer variable and name as character variable.
01:16 These are declared as protected.
01:19 Then we have another class exam_inherit.
01:24 This is also a base class.
01:26 Hence we have two base classes here- student and exam_inherit.
01:32 In this, we have 3 variables- sub1, sub2 and sub3 as protected.
01:38 This is because protected variables can be accessed by derived class.
01:44 Now, here we have class "grade" which is the derived class.
01:50 This inherits the base classesclass "student"' and class "exam_inherit".
01:56 In this, we have avg as integer variable declared as private.
02:02 Then we have functions:
02:04 'input()'display()
02:06 'average()'input_exam()
02:08 and display_exam() as public functions.
02:11 In this, we have total as integer variable declared as public.
02:17 Then, we use input() function to accept the roll_no and name of the student.
02:24 In display() function, we display the roll_no and name of the student.
02:28 Here, we have function input_exam().
02:31 In this, we accept the marks of three subjects as sub1, sub2 and sub3.
02:37 Then in display_exam() function, we calculate the total of three subjects and print the total.
02:44 And in function average(), we calculate the average.
02:48 This is our main() function.
02:51 In this, we create an object of class grade which is the derived class as gd.
02:57 Then we call all the above functions.
03:01 This is our return statement.
03:03 Now, let us execute the program.
03:05 Open the terminal window by pressing Ctrl, Alt and T keys simultaneously on your keyboard.
03:14 To compile, type: g++ space multiple dot cpp space hyphen o space mult. Press Enter.
03:24 Type: dot slash mult. Press Enter.
03:29 Here we see, Enter Roll no.:
03:32 I will enter as 3.
03:34 Enter Name:
03:36 I will enter as Pratham.
03:39 Enter marks of subject1:
03:41 I will give as 67.
03:43 subject2 as 78 and.
03:46 subject3 as 84.
03:48 The output is displayed as:
03:51 'Roll no is: 3'Name is: Pratham
03:53 Total is: 229
03:55 Average is: 76.
03:58 This was multiple inheritance.
04:00 Now, we will see hierarchical inheritance.
04:03 Come back to our program.
04:05 In hierarchical inheritance, multiple derived classes inherit from one base class.
04:12 Note that our 'file name' is hierarchical dot cpp.
04:16 I will explain the code now.
04:19 This is our header file as iostream.
04:22 Here we have used the std namespace.
04:25 Then, we have class student which is the base class.
04:29 In this, we have roll_no as integer variable.
04:34 Sub1, sub2, sub3 and total as integer variables.
04:40 Then name as character variable.
04:43 These are declared protected.
04:46 Here, we have another class 'show'.
04:49 This is the derived class.
04:51 It inherits the properties of class student.
04:54 In this, we have two functions: input() and display().
04:59 These are declared as public functions.
05:02 In function input(), we accept the roll_no and name of the student.
05:07 In function display(), we display the roll_no and name of the student.
05:11 Then we have another derived class as class exam.
05:15 This also inherits class student.
05:19 You can see that there are two derived classes- class exam and class show.
05:26 Both the classes inherit the class "student".
05:30 In class exam, we have two functions as input_exam() and total_marks() declared as public.
05:38 Here, we access the function input_exam().
05:41 It accepts the marks of three subjects- sub1, sub2 and sub3.
05:46 Then we have total_marks() function.
05:49 It calculates the total of three subjects and prints the total.
05:53 This is our main() function.
05:56 In this, we create objects of three classes as st, sw and em.
06:03 Then we call all the above functions using these objects.

sw.input();

em.input_exam();

sw.display();

em.total_marks();

06:15 And this is our return statement.
06:17 Now, let us execute the program.
06:19 Come back to the terminal.
06:21 Let me clear the prompt.
06:24 Let us compile, type: g++ space hierarchical dot cpp space hyphen o space hier
06:36 Press Enter.Type: dot slash hier
06:41 Press Enter.
06:43 Enter Roll no.:I will give as 4.
06:46 Enter Name:I will give as Ashwini.
06:50 Enter marks of subject1
06:52 I will give as 87.
06:54 subject2 as 67 and subject3 as 97.
07:00 The output is displayed as:
07:02 Roll no is: 4
07:04 Name is: Ashwini and
07:06 Total is : 251This brings us to the end of this tutorial.
07:10 Come back to our slides.
07:13 Let us summarize.In this tutorial, we learnt-
07:16 Multiple Inheritance and
07:18 Hierarchical Inheritance.
07:20 As an assignment: Create a class area and perimeter.
07:25 Find the area and perimeter of rectangle.
07:29 Watch the video available at the link shown below.
07:32 It summarizes the Spoken Tutorial project.
07:35 If you do not have good bandwidth, you can download and watch it.
07:40 The Spoken Tutorial Project Team:
07:42 Conducts workshops using spoken tutorials.
07:45 Gives certificates to those who pass an online test.
07:49 For more details, please write to:
07:51 contact@spoken-tutorial.org
07:56 Spoken Tutorial Project is a part of the "Talk to a Teacher" project.
08:01 It is supported by the National Mission on Education through ICT, MHRD, Government of India.
08:07 More information on this mission is available at the link shown below.
08:11 This is Ashwini Patil from IIT Bombay, signing off. Thank You for joining.

Contributors and Content Editors

PoojaMoolya, Pratik kamble, Sandhya.np14