C-and-C++/C3/Arrays/English

Title of script: Arryas in C and C++

Author: Ashwini Patil

Keywords: arrays, single dimensional, multi dimensional, video tutorial()

Visual Cue	Narration
Slide 1	Welcome to the spoken-tutorial on Arrays in C and C++.
Slide 2	In this tutorial we will learn, What is an array. Declaration of an array. Initialization of an array. We will do this with the help of an example. We will also explain some common errors and their solutions.
Slide 3	To record this tutorial, I am using, Ubuntu Operating System version 11.04, gcc and g++ Compiler version 4.6.1 on Ubuntu.
Slide 4-5	Let us start with the introduction to Array. Array is the collection of data or elements of same data-type. Array index starts from 0. The first element is stored at index 0. eg. pen[5]; Here, we are declaring a character array which contains 5 elements. pen[0] to pen[4]. There are three types of arrays: Single dimensional array. Two dimensional array. Multi-dimensional array. We will be discussing single dimensional array in this tutorial.
Slide 6	Let us see how to declare single dimensional array. The Syntax for this is: data-type array-name[size]; eg. char star[5];
Slide 7	Let us see how to initialize the array. The Syntax for this is: data-type array-name[size]={values}; eg. int star[3]={1,2,3};
On the editor	Now let us see how to declare an array through an example. I have already typed the program on the editor. So, I will open it. Let me explain the program.
Point to array.c	Note that our file name is array.c
	In this program, we will calculate the sum of the elements stored in an array.
Highlight #include <stdio.h>	This is our header file.
Highlight int main()	This is our main function.
Highlight int star[3]={1,2,3};	Here, we have declared and initialized an array star with size 3.
Highlight int sum;	Then we have declared a variable sum.
Highlight sum = star[0] + star[1] + star[2];	Here we add the values and store the result in sum.
Highlight printf("The sum is %d\n",sum);	Then we print the result.
Highlight return 0;	This is our return statement.
Click on Save	Now, click on Save.
	Let us execute the program.
Press Ctrl, Alt and T keys	Please open the terminal window by pressing Ctrl, Alt and T keys simultaneously.
On the terminal Type gcc array.c -o arr ./arr	To compile type, gcc array.c -o arr To execute type, ./arr
Highlight Output	Here the output is displayed as, The sum is 6.
Errors	Now let us see some common errors which we can come accross.
On the editor	Come back to our program.
Delete {} int star[3]=1,2,3;	Suppose here, we miss the curly brackets.
Click on Save	Click on Save.
	Let us execute.
On the terminal	Come back to the terminal. Let us compile as before. Let us execute as before.
Highlight Error	We see an error. Invalid initializer and Expected identifier or '(' before numeric constant.
{ }	As arrays must be initialized within curly brackets.
	Now let us see how to execute the same program in C++.
On the editor	Come back to our program.
	I will change a few things here.
Click on File menu Click on Save as option	First click on File menu, Click on Save as option, Save the file with .cpp extension.
Type iostream	Let us change the header file as iostream.
Type using namespace std;	Include the using statement.
Type cout <<	Now replace the printf statement with the cout statement.
Click on Save	click on Save
	Lets execute the program.
On the terminal	Come back to the terminal
Type g++ array.cpp -o arr Type ./arr	To compile type, g++ array.cpp -o arr To execute ./arr
Highlight Output	Here the output is displayed as, The sum is 6.
Errors	Now let see another common error
At line 7 Type: star[1] + star[2] + star[3];	Suppose here, at line number 7 We type star[1] + star[2] + star[3];
On the terminal	Let us execute and see. Come back to the terminal.
	Let us compile and execute as before.
Highlight Output	The output is displayed as: The sum is .... We get an unexected output. This is because array index starts from 0.
Highlight star[1]	Come back to the editor Here the index starts from 1 Hence it is giving an error.
Summary	In this tutorial we learned, Arrays. To declare Single Dimensional Array. To initialize Single Dimensional Array. eg. int star[3]={1,2,3}
Assignment	As an assignment, Write a program to calculate the difference of the elements stored in an array.
Slide 11 http://spoken-tutorial.org /What\_is\_a\_Spoken\_Tutorial About the Spoken Tutorial Project	Watch the video available at the link shown below It summarises the Spoken Tutorial project If you do not have good bandwidth, you can download and watch it
Slide 12 Spoken Tutorial Workshops	The Spoken Tutorial Project Team Conducts workshops using spoken tutorials Gives certificates to those who pass an online test For more details, please write to contact@spoken-tutorial.org
Slide 13 Acknowledgement	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: http://spoken-tutorial.org\NMEICT-Intro
	Ashwini Patil from IIT Bombay Thank You for joining

Contributors and Content Editors

Ashwini