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

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|This inherits the '''base classes''' - '''class "student"''' and '''class "exam_inherit"'''.
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|This inherits the '''base classes''' – '''class student"' and '''class "exam_inherit"'''.
  
 
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| To compile, type '''g++ space multiple.cpp space -o space mult''' Press '''Enter'''
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| To compile, type '''g++ space multiple dot cpp space hyphen o space mult'''. Press '''Enter'''
  
 
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|Type''' dot slash mult'''. Press '''Enter'''
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|In '''hierarchical inheritance multiple derived classes''' inherits from one '''base class'''.
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|In '''hierarchical inheritance,  multiple derived classes''' inherits from one '''base class'''.
  
 
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| Note that our filename is '''hierarchical.cpp'''
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| Then we call all the above '''functions.'''
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'''sw.input();'''
 
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|Come back to the '''terminal'''.
 
|Come back to the '''terminal'''.
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|Let us compile Type
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|Let us compile, Type '''g++ space hierarchical dot cpp space  hyphen o hier'''
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'''g++  hierarchical.cpp -o hier'''
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|'''Press Enter'''
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|Type|'''./hier'''
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|Type '''./hier'''
  
 
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|'''Press Enter'''
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|'''Enter Roll no.:'''
 
|'''Enter Roll no.:'''
  
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|  This brings us to the end of this tutorial.
 
|  This brings us to the end of this tutorial.
  
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|More information on this Mission is available at: [http://spoken-tutorial.org/NMEICT-Intro http://spoken-tutorial.org\NMEICT-Intro]
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|More information on this Mission is available at the link shown below.
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|08:11
 
|08:11

Revision as of 11:44, 16 July 2014

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 v. 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 filename 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 headerfile as iostream
01:01 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 class here- student and exam_inherit.
01:32 In this we have 3 variables- sub1, sub2, 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 classes – class student"' and class "exam_inherit".
01:56 In this we have avg as integer variable declared as private.
02:02 Then we have function
02:04 input()
02:05 display()
02:06 average()
02:07 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 the 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 enter 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
03:52 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 inherits from one base class.
04:12 Note that our filename 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 class- class exam and class show.
05:26 Both the classes inherits 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 print 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 object.

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 hier
06:36 Press Enter
06:37 Type ./hier
06:41 Press Enter
06:43 Enter Roll no.:
06:44 I will give as 4
06:46 Enter Name:
06:47 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 : 251
07:07 This brings us to the end of this tutorial.
07:10 Come back to our slides.
07:13 Let us summarize
07:14 In this tutorial, we learnt,
07:16 Multiple Inheritance.
07:18 Hierarchical Inheritance.
07:20 As an assignment
07:21 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 about:startpage
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

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