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

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(Created page with '{| border=1 || ''Time''' || '''Narration''' |- | 00:02 |Welcome to the spoken tutorial on Pointers in C and C++ |- | 00:07 |In this tutorial we will learn |- | 00:09 | Pointer…')
 
 
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{| border=1
+
{| border = 1
−
|| ''Time'''
+
|'''Time'''
−
|| '''Narration'''
+
|'''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 '''pointer_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 (&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.
+
|'''sizeof()''' 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 asterisk 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 terminal window by pressing '''Ctrl, Alt''' and '''T''' keys simultaneously on your keyboard.
 +
 
 
|-
 
|-
−
| 02:23
+
|02:21
−
|gcc pointer_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 a 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 here 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
+
−
| To compile type:
+
−
|-
+
−
| 03:36
+
−
| g++ pointers_demo.cpp -o point1
+
−
|-
+
−
| 03:48
+
−
| Press Enter
+
 
|-
 
|-
−
| 03:51
+
| 03:55
−
| Type:./point1. Press Enter
+
| We can see that the output is similar to our C program.
  
−
|-
 
−
| 03:56
 
−
|You can see that the output is similar to our C program.
 
 
|-
 
|-
 
| 04:00
 
| 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.In this tutorial, we learnt:
 +
 
 
|-
 
|-
−
| 04:07
+
| 04:08
−
| In this tutorial we  learnt.
+
|About the pointer.  
 +
 
 
|-
 
|-
−
| 04:09
+
| 04:10
−
| About the pointer.
+
|To create a pointer.  
−
|-
+
 
−
| 04:11
+
−
| 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
+
| 04:30
−
| It summarizes the Spoken Tutorial project  
+
|It summarizes the Spoken Tutorial project.
  
 
|-
 
|-
 
| 04:33
 
| 04:33
−
| 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.
−
 
+
−
 
+
  
 
|-
 
|-
−
| 04:38
+
| 04:37
−
| The Spoken Tutorial Project Team  
+
|The Spoken Tutorial Project Team:
  
 
|-
 
|-
−
| 04:40
+
| 04:39
−
| Conducts workshops using spoken tutorials  
+
|Conducts workshops using spoken tutorials.
  
 
|-
 
|-
−
| 04:43
+
|04:43
−
| Gives certificates for those who pass an online test  
+
|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.

Latest revision as of 14:53, 24 March 2017

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 (&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 sizeof() 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 asterisk 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 terminal 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 a few changes like the header file as iostream.
03:19 Then we are using the std namespace.
03:23 And here 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.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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