C-and-C++/C4/Understanding-Pointers/English-timed

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	Pointers.
00:10	To create Pointers.
00:12	And operations on Pointer.
00:15	We will do this with the help of an example.
00:18	To record this tutorial I am using Ubuntu OS v11.10 gcc and g++ compiler v4.6.1 on ubuntu.
00:32	Let us start with an introduction to pointers.
00:35	Pointers point to the locations in memory.
00:39	Pointers store a memory address.
00:42	It also gives value stored at that address.
00:45	Now let us see an example on pointers.
00:49	Note that our file name is pointer_demo.c
00:54	Let us go through the code now
00:57	This is our headerfile as stdio.h
01:01	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.
01:13	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.
01:34	This statement will print the address of the variable num.
01:38	Over here ptr stores the address of num.
01:48	This statement will print the address of ptr.
01:46	Size of function will give the size of ptr.
01:49	This is will give the value of ptr.
01:52	That is the memory address of num.
01:55	And here asterisk ptr will give the value at the address. '
02:00	So using asterik will not give the memory address.
02:03	Instead it will give the value. %ld is the format specifier for long int.
02:11	Now let us execute the program.
02:14	Open the terminal window by pressing ctrl+alt+t keys simultaneously on your keyboard.
02:22	To compile type:
02:23	gcc pointer_demo.c -o point
02:33	Press Enter
02:35	type ./point.Press Enter
02:39	The output is displayed
02:42	We see that the num address and ptr value is same.
02:48	Whereas 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
03:04	Now let us see the same program in C++.
03:08	Note that our filename is pointers_demo.cpp
03:14	Here we have a few changes like the header file as isotream '
03:20	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.
03:31	Let us execute the program
03:33	Come back to our terminal.
03:35	To compile type:
03:36	g++ pointers_demo.cpp -o point1
03:48	Press Enter
03:51	Type:./point1. Press Enter
03:56	You 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 slides.
04:06	Let us summarize:
04:07	In this tutorial we learnt.
04:09	About the pointer.
04:11	To create a pointer.
04:12	And Operation on pointer.
04:15	As an assignment write a C and C++ program,
04:18	To declare a variable and pointer.
04:22	Store the address of variable in the pointer.
04:25	And Print the value of the pointer.
04:28	Watch the video available at http://spoken-tutorial.org/What_is_a_Spoken_Tutorial
04:31	It summarizes the Spoken Tutorial project
04:33	If you do not have good bandwidth, you can download and watch it
04:38	The Spoken Tutorial Project Team
04:40	Conducts workshops using spoken tutorials
04:43	Gives certificates for those who pass an online test
04:47	For more details, please write to contact@spoken-tutorial.org
04:54	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 http://spoken-tutorial.org/NMEICT-Intro
05:11	This is Ashwini Patil from IIT Bomabay. Siginning off.
05:15	Thanks for joining.

Contributors and Content Editors

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