Difference between revisions of "Advanced-C++/C2/Function-Overloading-And-Overriding/English-timed"

From Script | Spoken-Tutorial
Jump to: navigation, search
Line 5: Line 5:
 
|-
 
|-
 
|00:01
 
|00:01
−
| Welcome to the spoken tutorial on '''function Overloading and Overriding''' in '''C++.'''
+
| Welcome to the '''spoken tutorial''' on '''function Overloading and Overriding''' in '''C++.'''
  
 
|-
 
|-
 
|00:09
 
|00:09
−
| In this tutorial, we will learn,
+
| In this tutorial, we will learn:
  
 
|-
 
|-
 
|00:11
 
|00:11
−
|'''Function Overloading.'''
+
|* '''Function Overloading'''
  
 
|-
 
|-
 
|00:12
 
|00:12
−
|'''Function Overriding.'''
+
|* '''Function Overriding.'''
  
 
|-
 
|-
Line 25: Line 25:
 
|-
 
|-
 
|00:18
 
|00:18
−
| To record this tutorial, I am using
+
| To record this tutorial, I am using:
  
 
|-
 
|-
 
|00:21
 
|00:21
−
|'''Ubuntu OS '''version 11.10
+
|* '''Ubuntu OS '''version '''11.10'''
  
 
|-
 
|-
 
|00:26
 
|00:26
−
|'''g++ compiler '''v. 4.6.1
+
|* '''g++ compiler '''version '''4.6.1'''
  
 
|-
 
|-
Line 49: Line 49:
 
|-
 
|-
 
|00:47
 
|00:47
−
|When a '''function''' is called it is selected based on the argument list.
+
|When a '''function''' is called, it is selected based on the '''argument list'''.
  
 
|-
 
|-
Line 57: Line 57:
 
|-
 
|-
 
|00:56
 
|00:56
−
|I have already typed the code on the editor.
+
|I have already typed the '''code''' on the '''editor'''.
  
 
|-
 
|-
 
|00:59
 
|00:59
−
|In this program we will perform addition operations
+
|In this program, we will perform addition operations.
  
 
|-
 
|-
 
|01:03
 
|01:03
−
|Note that our file name is '''overload.cpp'''
+
|Note that our file name is '''overload.cpp'''.
  
 
|-
 
|-
Line 81: Line 81:
 
|-
 
|-
 
|01:17
 
|01:17
−
|Then we have '''add''' function defined as '''int.'''
+
|Then we have '''add()''' function defined as '''int.'''
  
 
|-
 
|-
 
|01:21
 
|01:21
−
|In this we have passed three arguments.
+
|In this, we have passed three arguments.
  
 
|-
 
|-
 
|01:24
 
|01:24
−
|'''Int a, int b''' and '''int c'''
+
|'''Int a, int b''' and '''int c'''.
  
 
|-
 
|-
Line 97: Line 97:
 
|-
 
|-
 
|01:33
 
|01:33
−
|Here we overload the function '''add.'''
+
|Here we '''overload''' the function '''add().'''
  
 
|-
 
|-
Line 105: Line 105:
 
|-
 
|-
 
|01:38
 
|01:38
−
|We had pass two arguments '''float d'''  and '''float e'''
+
|We have  passed two '''arguments''' '''float d'''  and '''float e'''.
  
 
|-
 
|-
Line 113: Line 113:
 
|-
 
|-
 
|01:48
 
|01:48
−
|This is our '''main''' function.
+
|This is our '''main()''' function.
  
 
|-
 
|-
 
|01:50
 
|01:50
−
|In''' function''' '''main '''we declare the '''add''' '''function''' with different '''arguments'''.
+
|In function '''main()''', we declare the '''add()''' '''function''' with different '''arguments'''.
  
 
|-
 
|-
Line 129: Line 129:
 
|-
 
|-
 
|02:03
 
|02:03
−
|Then we call the function '''add '''with three ''' arguments.'''  
+
|Then we call the function '''add() '''with three ''' arguments'''  
  
 
|-
 
|-
 
|02:07
 
|02:07
−
|And store the result in variable''' sum.'''
+
|and store the result in variable''' sum.'''
  
 
|-
 
|-
 
|02:09
 
|02:09
−
|Here we print the result.
+
|Here we '''print''' the result.
  
 
|-
 
|-
 
|02:12
 
|02:12
−
|Now here we accept '''floating point numbers''' from the user.
+
|Now, here we accept '''floating point numbers''' from the user.
  
 
|-
 
|-
 
|02:17
 
|02:17
−
|Then we call the add function with two arguments.  
+
|Then we call the '''add()''' function with two arguments.  
  
 
|-
 
|-
Line 153: Line 153:
 
|-
 
|-
 
|02:23
 
|02:23
−
|And this is our '''return''' statement
+
|And this is our '''return''' statement.
  
 
|-
 
|-
 
|02:26
 
|02:26
−
|Now let us execute the program
+
|Now, let us '''execute''' the program.
  
 
|-
 
|-
 
|02:29
 
|02:29
−
|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.
  
 
|-
 
|-
 
|02:38
 
|02:38
−
|To execute type: '''g++ space overload dot cpp space hyphen o space over'''
+
|To execute, type: '''g++ space overload dot cpp space hyphen o space over'''
  
 
|-
 
|-
 
|02:49
 
|02:49
−
|Press '''Enter'''
+
|Press '''Enter'''.
  
 
|-
 
|-
 
|02:51
 
|02:51
−
|Type '''dot slash over'''
+
|Type: '''dot slash over'''
  
 
|-
 
|-
 
|02:53
 
|02:53
−
|Press '''Enter'''
+
|Press '''Enter'''.
  
 
|-
 
|-
 
|02:55
 
|02:55
−
|It is displayed '''Enter three integers'''
+
|It is displayed- '''Enter three integers'''
  
 
|-
 
|-
Line 189: Line 189:
 
|-
 
|-
 
|03:04
 
|03:04
−
|The output is displayed as: '''Sum of integers is 83'''
+
|The '''output''' is displayed as: '''Sum of integers is 83'''
  
 
|-
 
|-
 
|03:09
 
|03:09
−
|Now we see: '''Enter two floating point numbers'''
+
|Now we see- '''Enter two floating point numbers'''
  
 
|-
 
|-
Line 201: Line 201:
 
|-
 
|-
 
|03:17
 
|03:17
−
|Press '''Enter'''
+
|Press '''Enter'''.
  
 
|-
 
|-
 
|03:19
 
|03:19
−
|The output is displayed as: '''Sum of floating point numbers is 13.4'''
+
|The '''output''' is displayed as: '''Sum of floating point numbers is 13.4'''
  
 
|-
 
|-
Line 213: Line 213:
 
|-
 
|-
 
|03:29
 
|03:29
−
|Let us switch back to our slides.
+
|Let us switch back to our '''slides'''.
  
 
|-
 
|-
 
|03:31
 
|03:31
−
|Redefining a '''base class''' '''function''' in the derived class.
+
|Redefining a '''base class''' '''function''' in the '''derived class'''.
  
 
|-
 
|-
 
|03:36
 
|03:36
−
|The derived '''class function''' overrides the base class function.
+
|The '''derived class''' function '''overrides''' the '''base class''' function.
  
 
|-
 
|-
Line 233: Line 233:
 
|-
 
|-
 
|03:47
 
|03:47
−
|Let us see an example
+
|Let us see an example.
  
 
|-
 
|-
 
|03:49
 
|03:49
−
|Here is an example on '''function Overriding'''
+
|Here is an example on '''function Overriding'''.
  
 
|-
 
|-
Line 249: Line 249:
 
|-
 
|-
 
|04:00  
 
|04:00  
−
|This is our header file as '''iostream'''
+
|This is our '''header file''' as '''iostream'''.
  
 
|-
 
|-
Line 261: Line 261:
 
|-
 
|-
 
|04:09
 
|04:09
−
|In this we have declared integer variables as  as '''protected.'''
+
|In this, we have declared '''integer variables''' as  as '''protected.'''
  
 
|-
 
|-
Line 269: Line 269:
 
|-
 
|-
 
|04:18
 
|04:18
−
|In these we have passed two arguments '''int x''' and '''int y'''.
+
|In these, we have passed two '''arguments'''- '''int x''' and '''int y'''.
  
 
|-
 
|-
Line 281: Line 281:
 
|-
 
|-
 
|04:30
 
|04:30
−
|In this we add the two numbers and print the '''sum.'''
+
|In this, we add the two numbers and print the '''sum.'''
  
 
|-
 
|-
 
|04:34
 
|04:34
−
|Here we close the class.
+
|Here we close the '''class'''.
  
 
|-
 
|-
Line 297: Line 297:
 
|-
 
|-
 
|04:45
 
|04:45
−
|In this we calculate the difference of two numbers and we print the difference.
+
|In this, we calculate the difference of two numbers and we print the difference.
  
 
|-
 
|-
Line 309: Line 309:
 
|-
 
|-
 
|04:57
 
|04:57
−
|In this we calculate the product of two numbers and display the product.
+
|In this, we calculate the product of two numbers and display the product.
  
 
|-
 
|-
 
|05:03
 
|05:03
−
|Then we have '''class Divide '''this also inherits the''' base class arithmetic.'''
+
|Then we have '''class Divide '''. This also inherits the''' base class arithmetic.'''
  
 
|-
 
|-
 
|05:09
 
|05:09
−
|In this we calculate the division of two numbers and  we display the division.
+
|In this, we calculate the division of two numbers and  we display the division.
  
 
|-
 
|-
 
|05:15
 
|05:15
−
|Note that the return type of the function is same and the arguments passed are also  same.
+
|Note that the '''return type''' of the function is same and the arguments passed are also  same.
  
 
|-
 
|-
 
|05:23
 
|05:23
−
|This is our '''main function.'''
+
|This is our '''main()''' function.
  
 
|-
 
|-
 
|05:26
 
|05:26
−
|In this we create an''' object '''of ''' class arithmetic''' as '''p.'''
+
|In this, we create an''' object '''of ''' class arithmetic''' as '''p.'''
  
 
|-
 
|-
Line 349: Line 349:
 
|-
 
|-
 
|05:46
 
|05:46
−
|Now here, '''p''' is set to the address of '''arith.
+
|Now here, '''p''' is set to the address of '''arith'''.
  
 
|-
 
|-
Line 357: Line 357:
 
|-
 
|-
 
|05:56
 
|05:56
−
|Now we call the '''function operations.'''
+
|Now we call the '''function operations().'''
  
 
|-
 
|-
Line 365: Line 365:
 
|-
 
|-
 
|06:02
 
|06:02
−
|Here we set '''subt''' to the address of '''arith.'''
+
|Here we set '''subt''' to the '''address''' of '''arith.'''
  
 
|-
 
|-
Line 373: Line 373:
 
|-
 
|-
 
|06:11
 
|06:11
−
|Again we call''' function operations.'''
+
|Again we call''' function operations().'''
  
 
|-
 
|-
Line 381: Line 381:
 
|-
 
|-
 
|06:18
 
|06:18
−
|Now,  here we set '''mult''' to the address of '''arith.'''
+
|Now,  here we set '''mult''' to the '''address''' of '''arith.'''
  
 
|-
 
|-
 
|06:22
 
|06:22
−
|And we pass  ''' 6 '''and''' 5''' as argument
+
|And we pass  ''' 6 '''and''' 5''' as arguments.
  
 
|-
 
|-
 
|06:26
 
|06:26
−
|We call '''function operations.'''
+
|We call '''function operations().'''
  
 
|-
 
|-
Line 397: Line 397:
 
|-
 
|-
 
|06:33
 
|06:33
−
|Atlast we set '''divd''' to the address of '''arith''' And we pass  '''6''' and '''3''' as '''arguments.'''  
+
|At last, we set '''divd''' to the '''address''' of '''arith''' and we pass  '''6''' and '''3''' as '''arguments.'''  
  
 
|-
 
|-
 
|06:41
 
|06:41
−
|Now we call operations '''functions'''
+
|Now we call '''operations()''' function.
  
 
|-
 
|-
Line 413: Line 413:
 
|-
 
|-
 
|06:50
 
|06:50
−
|Let us execute the program. Switch back to our terminal.
+
|Let us '''execute''' the program. Switch back to our '''terminal'''.
  
 
|-
 
|-
Line 421: Line 421:
 
|-
 
|-
 
|07:04
 
|07:04
−
|Press '''Enter'''
+
|Press '''Enter'''.
  
 
|-
 
|-
Line 429: Line 429:
 
|-
 
|-
 
|07:09
 
|07:09
−
|Press '''Enter'''
+
|Press '''Enter'''.
  
 
|-
 
|-
 
|07:11
 
|07:11
−
|The output is displayed as:  
+
|The '''output''' is displayed as:  
  
 
|-
 
|-
Line 449: Line 449:
 
|-
 
|-
 
|07:25
 
|07:25
−
|Let us switch back to our slides.
+
|Let us switch back to our '''slides'''.
  
 
|-
 
|-
Line 457: Line 457:
 
|-
 
|-
 
|07:31
 
|07:31
−
|'''Overloading''' can occurs without inheritance.
+
|'''Overloading''' can occur without '''inheritance'''.
  
 
|-
 
|-
 
|07:35
 
|07:35
−
|'''Overriding''' occurs when one class is inherited from another.
+
|'''Overriding''' occurs when one '''class''' is inherited from another.
  
 
|-
 
|-
 
|07:41
 
|07:41
−
|In '''overloading''' the arguments and the return-type must differ.
+
|In '''overloading''', the '''arguments''' and the '''return-type''' must differ.
  
 
|-
 
|-
 
|07:46
 
|07:46
−
|In '''overriding''' the arguments and the return type must be same.
+
|In '''overriding''', the '''arguments''' and the '''return-type''' must be same.
  
 
|-
 
|-
 
|07:51
 
|07:51
−
|In '''overloading''' the function name is same.
+
|In '''overloading''', the function name is same.
  
 
|-
 
|-
Line 481: Line 481:
 
|-
 
|-
 
|08:01
 
|08:01
−
|In '''overriding''' the function name is same.
+
|In '''overriding''', the function name is same.
  
 
|-
 
|-
 
|08:05
 
|08:05
−
|'''Derived class '''function can perform different operations from the base class.  
+
|'''Derived class '''function can perform different operations from the '''base class'''.  
  
 
|-
 
|-
Line 493: Line 493:
 
|-
 
|-
 
|08:13
 
|08:13
−
|In this tutorial learnt
+
|In this tutorial, we learnt:
  
 
|-
 
|-
 
|08:15
 
|08:15
−
|'''Function overloading.'''
+
|* '''Function overloading'''
  
 
|-
 
|-
Line 509: Line 509:
 
|-
 
|-
 
|08:24
 
|08:24
−
|'''Function Overriding.'''
+
|* '''Function Overriding'''
  
 
|-
 
|-
Line 517: Line 517:
 
|-
 
|-
 
|08:31
 
|08:31
−
|functions with the same argument and same return type and difference between both.
+
|* Functions with the same argument and same return-type and difference between both.
  
 
|-
 
|-
 
|08:38
 
|08:38
−
|As an assignment  
+
|As an assignment:
  
 
|-
 
|-
Line 529: Line 529:
 
|-
 
|-
 
|08:46
 
|08:46
−
|Using '''function overloading.'''
+
|using '''function overloading.'''
 
   
 
   
 
|-
 
|-
 
|08:48
 
|08:48
−
|Watch the video available at the link shown below
+
|Watch the video available at the link shown below.
  
 
|-
 
|-
 
|08:52
 
|08:52
−
|It summarizes the Spoken Tutorial project  
+
|It summarizes the Spoken Tutorial project.
  
 
|-
 
|-
 
|08:55
 
|08:55
−
|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.
  
 
|-
 
|-
 
|08:59
 
|08:59
−
|The Spoken Tutorial Project Team  
+
|The Spoken Tutorial Project Team:
  
 
|-
 
|-
 
|09:02
 
|09:02
−
|Conducts workshops using spoken tutorials  
+
|Conducts workshops using spoken tutorials.
  
 
|-
 
|-
 
|09:05
 
|09:05
−
|Gives certificates to those who pass an online test  
+
|Gives certificates to those who pass an online test.
  
 
|-
 
|-
 
|09:09
 
|09:09
−
|For more details, please write to,
+
|For more details, please write to:
  
 
|-
 
|-
Line 565: Line 565:
 
|-
 
|-
 
|09:16
 
|09:16
−
|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.
  
 
|-
 
|-
 
|09:20
 
|09:20
−
|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.
  
 
|-
 
|-
 
|09:27
 
|09:27
−
|More information on this Mission is available at the link shown below
+
|More information on this mission is available at the link shown below.
  
 
|-
 
|-
 
| 09:32
 
| 09:32
−
| This is Ashwini Patil from IIT Bombay signing off
+
| This is Ashwini Patil from IIT Bombay, signing off.
  
 
|-
 
|-

Revision as of 21:27, 28 June 2015

Time Narration
00:01 Welcome to the spoken tutorial on function Overloading and Overriding in C++.
00:09 In this tutorial, we will learn:
00:11 * Function Overloading
00:12 * Function Overriding.
00:14 We will do this with the help of examples.
00:18 To record this tutorial, I am using:
00:21 * Ubuntu OS version 11.10
00:26 * g++ compiler version 4.6.1
00:30 Let us start with an introduction to function overloading.
00:34 Function Overloading means two or more functions can have same name.
00:41 The number of arguments and the data-type of the arguments will be different.
00:47 When a function is called, it is selected based on the argument list.
00:53 Let us look at an example.
00:56 I have already typed the code on the editor.
00:59 In this program, we will perform addition operations.
01:03 Note that our file name is overload.cpp.
01:08 Let me explain the code now.
01:10 This is our header file as iostream.
01:13 Here we are using the std namespace.
01:17 Then we have add() function defined as int.
01:21 In this, we have passed three arguments.
01:24 Int a, int b and int c.
01:28 Then we perform addition of three numbers. And we return the value.
01:33 Here we overload the function add().
01:36 It is declared as float.
01:38 We have passed two arguments float d and float e.
01:44 Then we perform the addition operation on two numbers.
01:48 This is our main() function.
01:50 In function main(), we declare the add() function with different arguments.
01:56 Then we declare the variables.
01:58 Here we accept integer values from the user.
02:03 Then we call the function add() with three arguments
02:07 and store the result in variable sum.
02:09 Here we print the result.
02:12 Now, here we accept floating point numbers from the user.
02:17 Then we call the add() function with two arguments.
02:21 And here we print the sum.
02:23 And this is our return statement.
02:26 Now, let us execute the program.
02:29 Open the terminal window by pressing Ctrl, Alt and T keys simultaneously on your keyboard.
02:38 To execute, type: g++ space overload dot cpp space hyphen o space over
02:49 Press Enter.
02:51 Type: dot slash over
02:53 Press Enter.
02:55 It is displayed- Enter three integers
02:58 I will enter 10, 25 and 48
03:04 The output is displayed as: Sum of integers is 83
03:09 Now we see- Enter two floating point numbers
03:13 I will enter as: 4.5 and 8.9
03:17 Press Enter.
03:19 The output is displayed as: Sum of floating point numbers is 13.4
03:25 Now we will see function overriding.
03:29 Let us switch back to our slides.
03:31 Redefining a base class function in the derived class.
03:36 The derived class function overrides the base class function.
03:40 But the arguments passed are same.
03:44 And the return-type is also same.
03:47 Let us see an example.
03:49 Here is an example on function Overriding.
03:53 Note that our filename is override.cpp.
03:57 Let us go through the code.
04:00 This is our header file as iostream.
04:03 Here we are using the std namespace.
04:06 Then we have class arithmetic.
04:09 In this, we have declared integer variables as as protected.
04:14 Then we have function values declared as public.
04:18 In these, we have passed two arguments- int x and int y.
04:23 Then we stored the value in a and b.
04:26 Here we have virtual function as operations.
04:30 In this, we add the two numbers and print the sum.
04:34 Here we close the class.
04:37 Now we have class Subtract as derived class.
04:41 This inherits the base class arithmetic.
04:45 In this, we calculate the difference of two numbers and we print the difference.
04:50 Now we have another derived class as Multiply.
04:54 This also inherits base class arithmetic.
04:57 In this, we calculate the product of two numbers and display the product.
05:03 Then we have class Divide . This also inherits the base class arithmetic.
05:09 In this, we calculate the division of two numbers and we display the division.
05:15 Note that the return type of the function is same and the arguments passed are also same.
05:23 This is our main() function.
05:26 In this, we create an object of class arithmetic as p.
05:31 arith is the pointer to the class arithmetic.
05:35 Then we have subt object of class Subtract.
05:39 mult object of class Multiply.
05:42 And divd object of class Divide.
05:46 Now here, p is set to the address of arith.
05:50 Then we pass arguments as 30 and 12 in function values.
05:56 Now we call the function operations().
05:59 This will perform the addition operation.
06:02 Here we set subt to the address of arith.
06:07 And we pass 42 and 5 as arguments.
06:11 Again we call function operations().
06:14 This will perform subtraction of two numbers.
06:18 Now, here we set mult to the address of arith.
06:22 And we pass 6 and 5 as arguments.
06:26 We call function operations().
06:29 This will perform multiplication of two numbers.
06:33 At last, we set divd to the address of arith and we pass 6 and 3 as arguments.
06:41 Now we call operations() function.
06:44 This will perform division of two numbers.
06:48 And this is our return statement.
06:50 Let us execute the program. Switch back to our terminal.
06:54 Type: g++ space override dot cpp space hyphen o space over2
07:04 Press Enter.
07:06 Type: dot slash over2
07:09 Press Enter.
07:11 The output is displayed as:
07:13 Addition of two numbers is 42
07:16 Difference of two numbers is 37
07:19 Product of two numbers is 30 and Division of two numbers is 2
07:25 Let us switch back to our slides.
07:27 Let us see the difference of overloading and overriding.
07:31 Overloading can occur without inheritance.
07:35 Overriding occurs when one class is inherited from another.
07:41 In overloading, the arguments and the return-type must differ.
07:46 In overriding, the arguments and the return-type must be same.
07:51 In overloading, the function name is same.
07:55 But it behaves differently depending on the arguments passed to them.
08:01 In overriding, the function name is same.
08:05 Derived class function can perform different operations from the base class.
08:11 Let us summarize:
08:13 In this tutorial, we learnt:
08:15 * Function overloading
08:16 eg. int add with three different arguments and
08:21 float add with two different arguments.
08:24 * Function Overriding
08:26 eg. virtual int operations () and int operations ()
08:31 * Functions with the same argument and same return-type and difference between both.
08:38 As an assignment:
08:39 Write a program that will calculate the area of rectangle, square and circle
08:46 using function overloading.
08:48 Watch the video available at the link shown below.
08:52 It summarizes the Spoken Tutorial project.
08:55 If you do not have good bandwidth, you can download and watch it.
08:59 The Spoken Tutorial Project Team:
09:02 Conducts workshops using spoken tutorials.
09:05 Gives certificates to those who pass an online test.
09:09 For more details, please write to:
09:12 contact@spoken-tutorial.org
09:16 Spoken Tutorial Project is a part of the "Talk to a Teacher" project.
09:20 It is supported by the National Mission on Education through ICT, MHRD, Government of India.
09:27 More information on this mission is available at the link shown below.
09:32 This is Ashwini Patil from IIT Bombay, signing off.
09:36 Thank You for joining.

Contributors and Content Editors

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

Retrieved from "https://script.spoken-tutorial.org/index.php?title=Advanced-C%2B%2B/C2/Function-Overloading-And-Overriding/English-timed&oldid=22724"