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

Title of script: Pointer in C and C++

Author: Ashwini Patil

Keywords: Pointers, video tutorial()

Visual Cue	Narration
Opening slide1	Welcome to the spoken tutorial on Pointers in C and C++
Learning objectives Slide 2	In this tutorial we will learn Pointers. To create Pointers. And operations on Pointer. We will do this with the help of an example.
System Requirement Slide 3	For this tutorial I am using Ubuntu OS version11.10 gcc and g++ compiler version 4.6.1 on Ubuntu
What is a Pointer?	Let is start with an introduction to pointers. Pointers point to the locations in memory. Pointers store the memory address. It also gives value stored at that address.
Switch to gedit Text Editor	Now let us see an example on Pointers Note that our filename is pointer_demo.c Let us go through the code now. This is our header file as stdio.h This is our main function.
Highlight num	Here we have a long integer num assigned value 10.
Highlight *ptr	Then we have declared a pointer ptr. Asterisk sign is used to declare a pointer. This pointer can point to type long int.
Highlight &num	In the printf statement ampersand is used for retrieving memory address of the variable. So ampersand num will give the memory address of num. This statement will print the address of the variable num.
Highlight ptr=&num	Over here ptr stores the address of num.
Highlight &ptr	This statement will print the address of ptr.
Highlight sizeof(ptr)	Sizeof function will give the size of ptr.
Highlight ptr	This will give the value of ptr. That is the memory address of num.
Highlight *ptr	And here asterisk ptr will give the value at the address. So using asterik will not give the memory address. Instead it will give the value. %ld is the format specifier for long int.
Save, Compile and Run	Now let us execute the program. Open the terminal by pressing Ctrl, Alt and T keys simultaneously on your keyboard.
Type: gcc pointer_demo.c -o point. ./point	To compile type: gcc space pointer_demo.c space -o space point. Press Enter ./point Press Enter
Output	The output is displayed. We see that the num address and ptr value is same. Where as memory address of num and ptr are different. Then the size of pointer is 8 bytes. Also the value pointed by ptr is 10, which was assigned to num.
Code in C++	Now let us see the same program in C++. Note that the filename is pointers_demo.cpp Here we have a few changes.
Highlight Code in C++	Like the header file as iostream Then we are using the std namespace
Highlight Code in C++	Here we have cout function in place of printf function. Rest all the things are similar.
On the terminal	Let us execute the program. Come back to our terminal.
	To compile type: g++ space pointer_demo.cpp space -o space point1 Press Enter ./point1 Press Enter
Output	We can see that the output is similar to our C program. This brings us to the end of this tutorial. Come back to our slides.
Summary Slide	Let us summarize. In this tutorial we have learnt. About the pointer. To create a pointer. Operation on pointer.
Assignment Slide	As an assignment Write a C and C++ program, declare a variable and pointer. Store the address of variable in the pointer. Print the value of pointer.
Slide 8 About Slide	To know more about the Spoken Tutorial Project Watch the video available at the link shown belowhttp://spoken-tutorial.org/What_is_a_Spoken_Tutorial It summarizes the Spoken Tutorial project If you do not have good bandwidth, you can download and watch it
Slide 9 About Slide	The Spoken Tutorial Project Team Conducts workshops using spoken tutorials Gives certificates for those who pass an online test For more details, please write to contact@spoken-tutorial.org
Slide 10 Acknowledgment	Spoken Tutorial Project is a part of the Talk to a Teacher project It is supported by the National Mission on Education through ICT, MHRD, Government of India More information on this Mission is available at the link shown below. http://spoken-tutorial.org/NMEICT-Intro
	We have come to the end of this tutorial. Thanks for joining. This is Ritwik signing off. Jai Hind.

Contributors and Content Editors

Ashwini