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

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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