C-and-C++/C3/Working-With-2D-Arrays/English-timed

Time	Narration
00:01	Welcome to the spoken-tutorial on 2 Dimensional Arrays in C and C++.
00:08	In this tutorial, we will learn-
00:10	what is a 2 Dimensional array.
00:13	We will do this through an example.
00:16	To record this tutorial, I am using
00:18	Ubuntu Operating System version 11.10,
00:22	gcc and g++ Compiler version 4.6.1 on Ubuntu.
00:29	Let us start with the introduction to 2 dimensional Array.
00:33	2D arrays are stored in a row column matrix.
00:38	The left index indicates the row.
00:41	The right index indicates the column.
00:44	Starting index of a matrix or array in C and C++ is always 0.
00:52	Here, we see a 2 Dimensional array in a row column matrix.
00:58	Starting index is 0.
01:01	Now, let us see how to declare 2 dimensional array.
01:04	The Syntax for this is:
01:07	data-type ,array name, row and column.
01:13	example, here we have declared a 2 dimensional array num with 2 rows and 3 columns.
01:21	Now let us see an example.
01:23	I have already typed the program, let me open it.
01:28	Note that our file name is 2d hyphen array dot c.
01:33	In this program, we will calculate the sum of the elements of the 2 dimensional array.
01:41	Let me explain the code now.
01:44	This is our header file.
01:46	This is our main() function.
01:49	Here we have declared variables i and j.
01:53	Then we have declared num1 with 3 rows and 4 columns.
01:58	And num2, again with 3 rows and 4 columns.
02:03	num1 and num2 are 2 dimensional arrays.
02:07	Here, we take elements of the matrix num1 as input from the user.
02:13	The elements are stored row-wise.
02:16	We have considered i for rows and j for columns.
02:22	This for loop will check the condition that i runs from 0 to 2.
02:28	This for loop will check the condition that j runs from 0 to 3.
02:33	Similarly, here we take elements of the matrix num2 as input from the user.
02:40	Here we display the matrix num1.
02:43	Here percent 3d is used to align the matrix on the terminal.
02:49	Now, here we display the matrix num2.
02:52	Then we add the num1 matrix and the num2 matrix and display the result.
02:59	This is our return statement.
03:01	Now, click on Save.
03:05	Let us execute the program.
03:07	Please open the terminal window by pressing Ctrl, Alt and T keys simultaneously on your keyboard.
03:15	To compile, type gcc space 2d hyphen array dot c space hyphen o space arr and press Enter.
03:28	To execute, type dot slash arr (./arr), now press Enter .
03:34	Here we see Enter the elements of 3 into 4 array num1.
03:39	I will enter the values now.
03:52	Now we can see Enter the elements of 3 into 4 array num2.
03:57	I will enter the values.
04:10	The output is displayed.
04:13	Here we can see the num1 matrix.
04:16	Here we can see the num2 matrix.
04:20	And this is the sum of num1 and num2.
04:24	Now we will see how to execute the same program in C++.
04:29	I have already made the program. I will open it and explain.
04:34	This is the program for 2 Dimensional arrays in C++.
04:38	Note that our file name is 2d hyphen array dot cpp.
04:43	The extension is dot cpp (.cpp).
04:47	Let me explain the code now.
04:50	This is our header file as iostream.
04:53	This is our using statement.
04:56	This is our main() function.
04:58	Here we have cout function as we use cout to print the output in C++.
05:06	Then we have cin function. We use cin to read a line in C++.
05:13	Here, we use / t bit mean horizontal tab that is equivalent to 4 spaces.
05:21	Rest of the code is similar to our C code.
05:25	Now click on Save.
05:27	Let us execute. Come back to a terminal.
05:31	Let me clear the prompt.
05:33	To compile, type g++ space 2d hyphen array dot cpp hyphen o space arr1 and press Enter.
05:47	To execute, type dot slash arr1, now press Enter.
05:52	Here we see Enter the elements of 3 into 4 array num1.
05:57	I will enter the values.
06:07	Now, we see Enter the elements of 3 into 4 array num2.
06:13	I will give the values as:
06:24	The output is displayed.
06:26	We can see the num1 matrix, the num2 matrix.
06:31	And this is the sum of num1 and num2.
06:36	This brings us to the end of this tutorial.
06:39	Come back to our slide. Let us Summarize.
06:43	In this tutorial we learnt:
06:45	To add elements in a 2D array.
06:48	To print 2D array.
06:50	And to calculate the sum of 2Dimensional array.
06:54	As an assignment: Write the program that takes two 2Dimensional arrays as input from the user.
07:01	Subtract them and find the result.
07:05	Watch the video available at the link shown below:
07:08	It summarizes the Spoken Tutorial project.
07:11	If you do not have good bandwidth, you can download and watch it.
07:15	The Spoken Tutorial Project Team:
07:17	Conducts workshops using spoken tutorials.
07:21	Gives certificates to those who pass an online test.
07:25	For more details, please write to, contact@spoken-tutorial.org.
07:32	Spoken Tutorial Project is a part of Talk to a Teacher project.
07:36	It is supported by the National Mission on Education through ICT, MHRD, Government of India.
07:43	More information on this mission is available at the link shown below.
07:48	The script is contributed by Ritwik Joshi. This is Ashwini Patil from IIT Bombay.
07:54	Thank you for watching.

Contributors and Content Editors

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