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

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|As an assignment, write a C and C++ program:
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|More information on this Mission is available at the link shown below.
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Revision as of 22:45, 15 February 2015

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.
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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