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Time' Narration
00:02 Welcome to the spoken-tutorial on 2dimensional Arrays in C and C++.
00:08 In this tutorial we will learn,
00:11 What is a 2dimensional array.
00:13 We will do this through an example.
00:16 To record this tutorial, I am using
00:19 Ubuntu Operating System version 11.10,
00:23 gcc and g++ Compiler version 4.6.1 on Ubuntu
00:30 Let us start with the introduction to 2 dimensional Array
00:34 2-D arrays are stored in a row column matrix.
00:38 The left index indicates the row.
00:42 The right index indicates the column. '

00:45 Starting index of a matrix or array in C and C++ is always 0.
00:52 Here we see a 2 dimensional array
00:55 In a row column matrix. Starting index is0

01:01 Now let us see how to declare a 2dimensional array
01:05 The Syntax for this is:
01:07 data-type arr_name[row] [col];
01:13 eg. Here we have declare a 2 dimensional array num[2][3];
01:22 Now let us see an example
01:24 I have already typed the program
01:26 Let me open it.

01:28 Note that our file name is 2d-array.c
01:34 In this program we will calculate, the sum of the elements of the 2dimensional arrays.
01:41 Let me explain the code now.
01:44 This is our header file.
01:47 This is our main function.
01:49 Here, we have declared variable i and j.
01:53 Then we have declared num1 with 3rows and 4columns
01:59 And num2 again with 3rows and 4columns

02:04 num1 and num2 are 2dimensional arrays
02:08 Here we take elements of the matrix num1 as input from the user.
02:14 The elements are stored row-wise.
02:17 We have considered i for rows and j for columns.
02:23 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.
02:34 Similarly, here we take elements of the matrix num2 as input from the user.

02:41 Here we display the matrix num1
02:44 Here %3d is used to align the matrix on the terminal.
02:50 Now here we display the matrix num2
02:53 Then we add the num1 matrix and the num2 matrix
02:57 And display the result
03:00 This is our return statement.
03:02 Now, click on Save.
03:05 Let us execute the program.
03:08 Please open the terminal window by pressing Ctrl, Alt and T keys simultaneously on your keyboard.
03:15 To compile type,
03:17 gcc 2d-array.c -o arr and press enter
03:29 To execute type, ./ arr now press enter.
03:34 Here we see enter the element of 3 into 4 array num1.
03:40 I will enter the values now
03:52 Now we can see enter the element of 3 into 4 array num2
03:58 I will enter the values.
04:11 The output is displayed,
04:13 Here we can see the num1 matrix.
04:17 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++.
04:30 I have already named the program. I will open it and explain.
04:34 This is the program for 2dimensional arrays in C++.
04:39 Note that our file name is 2d-array.cpp'. The extension is .cpp.
04:48 Let me explain the code now. 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 coutfunction. 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++
05:14 Here we use \t it means horizontal tab that is equivalent to 4 spaces.
05:21 Rest of the code is similar to our c code .Now click on Save'
05:27 Let us execute
05:29 Come back to our terminal
05:31 Let me clear the prompt.
05:34 To compile type, g++ 2d- array.cpp -o arr and press enter.
05:47 To execute type, ./arr1. Now press enter.
05:53 Here we see enter the element of 3 into 4 array num1.
05:58 I will enter the values.
06:08 Now we see enter the elements of 3 into 4 array num2.
06:14 I will give the values as
06:24 The output is displayed , We can see the num1 matrx, num2 matrix.
06:32 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 slides. Let us summarises
06:43 In this tutprial we learnt,
06:45 To add elements in a 2D array.
06:49 To print 2D array.
06:51 And To calculate the sum of 2D array.
06:55 As an assignment,
06:56 Write a program that takes two 2D arrays as input from the user.
07:02 Subtract them and find the result.
07:05 Watch the video available at the link shown below
07:08 It summarises the Spoken Tutorial project
07:11 If you do not have good bandwidth, you can download and watch it

07:16 The Spoken Tutorial Project Team
07:18 Conducts workshops using spoken tutorials
07:21 Gives certificates for those who pass an online test
07:26 For more details, please write to contact at spoken hyphen tutorial dot org

07:33 Spoken Tutorial Project is a part of the Talk to a Teacher project
07:37 - 07:44 More information on this Mission is available at the link shown below.

07:49 The script is contributed by Ritwik Joshi , this is Ashwini Patil from IIT Bombay.

Thank you for watching

Contributors and Content Editors

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