C-and-C++/C3/Working-With-2D-Arrays/English-timed
From Script | Spoken-Tutorial
| 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
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| 07:16 | The Spoken Tutorial Project Team |
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| 07:33 | Spoken Tutorial Project is a part of the Talk to a Teacher project |
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| 07:49 | The script is contributed by Ritwik Joshi , this is Ashwini Patil from IIT Bombay.
Thank you for watching |
