Difference between revisions of "C-and-C++/C4/Understanding-Pointers/English-timed"

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{| border=1
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{| border = 1
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|| ''Time'''
+
 
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|| '''Narration'''
+
|'''Time'''
 +
 
 +
|'''Narration'''
 +
 
  
 
|-
 
|-
−
| 00:02
+
| 00.01
−
|Welcome to the spoken tutorial on Pointers in C and C++
+
|Welcome to the spoken tutorial on Pointers in C and C++  
  
 
|-
 
|-
−
| 00:07
+
| 00.06
−
|In this tutorial we will learn
+
|In this tutorial we will learn, 
  
 
|-
 
|-
−
| 00:09
+
| 00.08
−
| Pointers.
+
|Pointers.  
  
 
|-
 
|-
−
| 00:10
+
| 00.10
−
| To create Pointers.
+
|To create Pointers.  
  
 
|-
 
|-
−
| 00:12
+
| 00.12
−
|And operations on Pointer.
+
|And operations on Pointers.  
  
 
|-
 
|-
−
| 00:15
+
| 00.14
−
|We will do this with the help of an example.
+
| We will do this with the help of an example
  
 
|-
 
|-
−
| 00:18
+
| 00.18
−
| To record this tutorial I am using  
+
|To record this tutorial I am using Ubuntu operating system version 11.10
−
 
+
−
Ubuntu   OS v11.10
+
−
 
+
−
gcc and g++  compiler v4.6.1 on ubuntu.
+
  
 +
|-
 +
| 00.25
 +
| gcc and g++ compiler version 4.6.1 on Ubuntu
  
 
|-
 
|-
−
| 00:32
+
| 00.31
−
|Let us start with an introduction to pointers.
+
|Let us start with an introduction to pointers
  
 
|-
 
|-
−
| 00:35
+
|00.34
−
| Pointers point to the locations in memory.
+
|Pointers point to the locations in memory.  
 
   
 
   
−
 
 
|-
 
|-
−
| 00:39
+
|00.38
−
|Pointers store a  memory address.  
+
|Pointers store the memory address.  
−
 
+
  
 
|-
 
|-
−
| 00:42
+
| 00.41
−
|It also gives value stored at that address.
+
|It also gives value stored at that address.  
  
 
|-
 
|-
−
| 00:45
+
| 00.45
−
| Now let us   see an example on pointers.
+
|Now, let us see an example on pointers
  
 
|-
 
|-
−
| 00:49
+
| 00.48
−
| Note that our file name is '''pointers_demo.c'''
+
|Note that our file name is pointers_demo.c
−
 
+
−
 
+
  
 
|-
 
|-
−
| 00:54
+
| 00.54
 
|Let us go through the code now
 
|Let us go through the code now
 +
 
|-
 
|-
−
| 00:57
+
| 00.56
−
|This is our headerfile as '''stdio.h'''
+
|This is our header file as stdio.h
 +
 
 
|-
 
|-
−
| 01:01
+
| 01.00
−
|This is our main function.
+
|This is our main function
 +
 
 
|-
 
|-
−
| 01:03
+
| 01.03
−
|Here we have long integer '''num''' assigned value 10.  
+
|Here we have long integer num assigned value 10.
−
+
 
 
|-
 
|-
−
| 01:09
+
| 01.09
−
| Then we have declared a pointer '''ptr'''.
+
|Then we have declared a pointer ptr.  
  
 
|-
 
|-
−
| 01:13
+
| 01.12
−
|'''Asterisk sign''' is used to declare a pointer.
+
|Asterisk sign is used to declare a pointer.  
  
 
|-
 
|-
−
| 01:16
+
| 01.16
−
|This pointer can point to type long int.
+
|This pointer can point to type long int.  
  
 
|-
 
|-
−
| 01:20
+
| 01.20
−
|In the printf statement ,'''Ampersand''' is used for retrieving memory address of the variable.
+
|In the printf statement ampersand is used for retrieving memory address of the variable.  
  
 
|-
 
|-
−
| 01:28
+
|01.28
−
|So ampersand num will give the memory address of num.
+
|So ampersand num will give the memory address of num.  
  
 
|-
 
|-
−
| 01:34
+
| 01.33
−
|This statement will print the address of the variable num.
+
|This statement will print the address of the variable num.  
  
 
|-
 
|-
−
| 01:38
+
| 01.37
−
| Over here ptr stores the address of num.  
+
|Over here ptr stores the address of num.  
  
 
|-
 
|-
−
| 01:48
+
| 01.41
−
|   This statement will print the address of ptr.
+
|This statement will print the address of ptr.  
 +
 
  
 
|-
 
|-
−
| 01:46
+
| 01.45
−
| Size of function will give the size of ptr.
+
|Size of function will give the size of ptr.  
  
 
|-
 
|-
−
| 01:49
+
|01.49
−
| This is will give the value of ptr.
+
|This is will give the value of ptr.  
  
 
|-
 
|-
−
| 01:52
+
|01.51
−
|That is the memory address of num.
+
|That is the memory address of num.  
  
 
|-
 
|-
−
| 01:55
+
|01.54
−
| And here '''asterisk ptr''' will give the value at the address.
+
|And here asterisk ptr will give the value at the address.  
−
'
+
 
 
|-
 
|-
−
| 02:00
+
|01.59
−
|So using '''asterik''' will not give the memory address.
+
|So using asterik will not give the memory address.  
  
 
|-
 
|-
−
| 02:03
+
|02.03
−
|Instead it will give the value.''' %ld '''is the format specifier for long int.
+
|Instead it will give the value.  
  
 
|-
 
|-
−
| 02:11
+
|02.06
−
| Now let us execute the program.
+
|%ld is a format specifier for the long int
 +
 
 
|-
 
|-
−
| 02:14
+
|02.10
−
| Open the terminal window by pressing ctrl+alt+t keys simultaneously on your keyboard.
+
|Now, let us execute the program
  
 
|-
 
|-
−
| 02:22
+
|02.13
−
| To compile type:
+
|Open the terinal window by pressing Ctrl, Alt and T keys simultaneously on your keyboard
 +
 
 
|-
 
|-
−
| 02:23
+
|02.21
−
|gcc pointers_demo.c -o point
+
|To compile type gcc space  pointers underscore demo dot c space hyphen o space point
 +
 
 +
 
 
|-
 
|-
−
| 02:33
+
|02.32
 
|Press Enter
 
|Press Enter
 +
 
|-
 
|-
−
| 02:35
+
|02.34
−
| type ./point.Press Enter
+
|Type dot slash point. Press Enter
 +
 
 
|-
 
|-
−
| 02:39
+
|02.39
 
|The output is displayed
 
|The output is displayed
 +
 
|-
 
|-
−
| 02:42
+
| 02.42
−
|We see that the num address and ptr value is same.
+
|We see that the num address and ptr value is same.  
 +
 
 
|-
 
|-
−
| 02:48
+
| 02.48
−
|Whereas memory address of num and ptr are different.
+
| Where as memory address of num and ptr are different.  
 +
 
 
|-
 
|-
−
| 02:53
+
| 02.53
−
|Then the size of pointer is 8 bytes.
+
|Then the size of pointer is 8 bytes.  
 +
 
 
|-
 
|-
−
| 02:57
+
| 02.57
−
|Also the value pointed by ptr is 10 which was assigned to num
+
| Also the value pointed by ptr is 10 which was assigned to num.
  
 
|-
 
|-
−
| 03:04
+
| 03.03
−
|Now let us see the same program in C++.
+
| Now let us see the same program in C++.  
  
 
|-
 
|-
−
| 03:08
+
| 03.07
−
|Note that our filename is pointers_demo.cpp
+
| Note that our file name is pointer underscore demo.cpp
  
 
|-
 
|-
−
| 03:14
+
| 03.13
−
|Here we have a few changes like the header file as '''isotream'''
+
| Here we have few changes like the header file as iostream
−
'
+
  
 
|-
 
|-
−
| 03:20
+
| 03.19
−
| Then we are using the std namespace.
+
|Then we are using the std namespace
  
 
|-
 
|-
−
| 03:23
+
| 03.23
−
|And here we have the cout function in place of printf function.
+
|And we have the cout function in place of printf function
  
 +
|-
 +
| 03.28
 +
|Rest all the things are similar
  
 
|-
 
|-
−
| 03:28
+
| 03.30
−
| Rest all the things are similar.
+
|Let us execute the program. Come back to our terminal.
  
 
|-
 
|-
−
| 03:31
+
| 03.34
−
| Let us execute the program
+
|To compile type g++ space pointers_demo.cpp space hyphen o space point1, press Enter
 +
 
 
|-
 
|-
−
| 03:33
+
| 03.50
−
| Come back to our terminal.
+
|Type dot slash point1, press Enter
 +
 
 
|-
 
|-
−
| 03:35
+
| 03.55
−
| To compile type:
+
| We can see that the output is similar to our C program
−
|-
+
−
| 03:36
+
−
| g++ pointers_demo.cpp -o point1
+
−
|-
+
−
| 03:48
+
−
| Press Enter
+
−
|-
+
−
| 03:51
+
−
| Type:./point1. Press Enter
+
  
 
|-
 
|-
−
| 03:56
+
| 04.00
−
|You can see that the output is similar to our C program.
+
−
|-
+
−
| 04:00
+
 
|This brings us to the end of this tutorial.
 
|This brings us to the end of this tutorial.
 +
 
|-
 
|-
−
| 04:03
+
| 04.03
−
|Come back to our slides.
+
| Come back to our slide
 +
 
 
|-
 
|-
−
| 04:06
+
| 04.05
−
| Let us summarize:
+
|Let us summarize
 +
 
 
|-
 
|-
−
| 04:07
+
| 04.06
−
| In this tutorial we   learnt.
+
|In this tutorial, we learnt
 +
 
 
|-
 
|-
−
| 04:09
+
| 04.08
−
| About the pointer.
+
|About the pointer.  
 +
 
 
|-
 
|-
−
| 04:11
+
| 04.10
−
| To create a pointer.
+
|To create a pointer.  
 +
 
 
|-
 
|-
−
| 04:12
+
| 04.12
−
| And Operation on pointer.
+
|And operation on pointer.  
  
 
|-
 
|-
−
| 04:15
+
| 04.14
−
|As an assignment write a C and C++ program,
+
|As an assignment, write a C and C++ program,  
−
+
  
 
|-
 
|-
−
| 04:18
+
| 04.18
−
|To declare a variable and pointer.
+
|To declare a variable and pointer.  
  
 
|-
 
|-
−
| 04:22
+
| 04.21
−
|Store the address of variable in the pointer.
+
| Store the address of variable in the pointer.  
  
 
|-
 
|-
−
| 04:25
+
| 04.24
−
|And Print the value of the pointer.
+
|And print the value of the pointer.  
  
−
 
 
|-
 
|-
−
| 04:28
+
| 04.27
−
| Watch the video available at [http://spoken-tutorial.org/What_is_a_Spoken_Tutorial http://spoken-][http://spoken-tutorial.org/What_is_a_Spoken_Tutorial tutorial.org/What_is_a_Spoken_Tutorial]
+
|Watch the video available at the link shown below
−
|-
+
−
| 04:31
+
−
| It summarizes the Spoken Tutorial project
+
  
 
|-
 
|-
−
| 04:33
+
| 04.30
−
| If you do not have good bandwidth, you can download and watch it
+
|It summarizes the Spoken Tutorial project
−
 
+
−
 
+
  
 
|-
 
|-
−
| 04:38
+
| 04.33
−
| The Spoken Tutorial Project Team
+
|If you do not have good bandwidth, you can download and watch it
  
 
|-
 
|-
−
| 04:40
+
| 04.37
−
| Conducts workshops using spoken tutorials
+
|The Spoken Tutorial Project Team
  
 
|-
 
|-
−
| 04:43
+
| 04.39
−
| Gives certificates for those who pass an online test
+
|Conducts workshops using spoken tutorials
  
 +
|-
 +
|04.43
 +
|Gives certificates to those who pass an online test
  
 
|-
 
|-
−
| 04:47
+
| 04.47
−
| For more details, please write to contact@spoken-tutorial.org  
+
|For more details, please write to, contact@spoken-tutorial.org  
−
 
+
−
 
+
  
 
|-
 
|-
−
| 04:54
+
| 04.53
−
| 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  
  
 
|-
 
|-
−
| 04:58
+
| 04.58
−
|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
  
 
|-
 
|-
−
|05:06  
+
| 05.06
−
| More information on this Mission is available at  
+
|More information on this Mission is available at the link shown below
−
 
+
−
* [http://spoken-tutorial.org/NMEICT-Intro http://spoken-tutorial.org/NMEICT-Intro]
+
−
 
+
−
 
+
  
 
|-
 
|-
−
| 05:11
+
| 05.10
−
| This is Ashwini Patil from IIT Bomabay. Siginning off.
+
| This is Ashwini Patil from IIT Bombay signing off  
  
 
|-
 
|-
−
| 05:15
+
| 05.14
−
|Thanks for joining.
+
|Thank You for joining.

Revision as of 16:25, 22 November 2013

Time Narration


00.01 Welcome to the spoken tutorial on Pointers in C and C++
00.06 In this tutorial we will learn,
00.08 Pointers.
00.10 To create Pointers.
00.12 And operations on Pointers.
00.14 We will do this with the help of an example
00.18 To record this tutorial I am using Ubuntu operating system version 11.10
00.25 gcc and g++ compiler version 4.6.1 on Ubuntu
00.31 Let us start with an introduction to pointers
00.34 Pointers point to the locations in memory.
00.38 Pointers store the memory address.
00.41 It also gives value stored at that address.
00.45 Now, let us see an example on pointers
00.48 Note that our file name is pointers_demo.c
00.54 Let us go through the code now
00.56 This is our header file as stdio.h
01.00 This is our main function
01.03 Here we have long integer num assigned value 10.
01.09 Then we have declared a pointer ptr.
01.12 Asterisk sign is used to declare a pointer.
01.16 This pointer can point to type long int.
01.20 In the printf statement ampersand is used for retrieving memory address of the variable.
01.28 So ampersand num will give the memory address of num.
01.33 This statement will print the address of the variable num.
01.37 Over here ptr stores the address of num.
01.41 This statement will print the address of ptr.


01.45 Size of function will give the size of ptr.
01.49 This is will give the value of ptr.
01.51 That is the memory address of num.
01.54 And here asterisk ptr will give the value at the address.
01.59 So using asterik will not give the memory address.
02.03 Instead it will give the value.
02.06 %ld is a format specifier for the long int
02.10 Now, let us execute the program
02.13 Open the terinal window by pressing Ctrl, Alt and T keys simultaneously on your keyboard
02.21 To compile type gcc space pointers underscore demo dot c space hyphen o space point


02.32 Press Enter
02.34 Type dot slash point. Press Enter
02.39 The output is displayed
02.42 We see that the num address and ptr value is same.
02.48 Where as memory address of num and ptr are different.
02.53 Then the size of pointer is 8 bytes.
02.57 Also the value pointed by ptr is 10 which was assigned to num.
03.03 Now let us see the same program in C++.
03.07 Note that our file name is pointer underscore demo.cpp
03.13 Here we have few changes like the header file as iostream
03.19 Then we are using the std namespace
03.23 And we have the cout function in place of printf function
03.28 Rest all the things are similar
03.30 Let us execute the program. Come back to our terminal.
03.34 To compile type g++ space pointers_demo.cpp space hyphen o space point1, press Enter
03.50 Type dot slash point1, press Enter
03.55 We can see that the output is similar to our C program
04.00 This brings us to the end of this tutorial.
04.03 Come back to our slide
04.05 Let us summarize
04.06 In this tutorial, we learnt
04.08 About the pointer.
04.10 To create a pointer.
04.12 And operation on pointer.
04.14 As an assignment, write a C and C++ program,
04.18 To declare a variable and pointer.
04.21 Store the address of variable in the pointer.
04.24 And print the value of the pointer.
04.27 Watch the video available at the link shown below
04.30 It summarizes the Spoken Tutorial project
04.33 If you do not have good bandwidth, you can download and watch it
04.37 The Spoken Tutorial Project Team
04.39 Conducts workshops using spoken tutorials
04.43 Gives certificates to those who pass an online test
04.47 For more details, please write to, contact@spoken-tutorial.org
04.53 Spoken Tutorial Project is a part of the Talk to a Teacher project
04.58 It is supported by the National Mission on Education through ICT, MHRD, Government of India
05.06 More information on this Mission is available at the link shown below
05.10 This is Ashwini Patil from IIT Bombay signing off
05.14 Thank You for joining.

Contributors and Content Editors

Kavita salve, Krupali, PoojaMoolya, Pratik kamble, Sandhya.np14, Sneha

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