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

{| border = 1
|'''Time'''
|'''Narration'''

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| 00:01
|Welcome to the spoken-tutorial on '''2 Dimensional Arrays''' in '''C''' and '''C++.'''

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| 00:08
|In this tutorial, we will learn-   

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| 00:10
|what is a '''2 Dimensional array.'''

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| 00:13
|We will do this through an example. 

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| 00:16
|To record this tutorial, I am using 

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| 00:18
| '''Ubuntu Operating System''' version 11.10, 

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| 00:22
|'''gcc''' and '''g++ Compiler''' version 4.6.1 on Ubuntu. 

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| 00:29
| Let us start with the introduction to '''2 dimensional Array'''.

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| 00:33
|'''2D arrays''' are stored in a row column matrix.

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|00:38
| The left index indicates the row.

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|00:41
|The right index indicates the column. 

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|00:44
|Starting index of a matrix or array in C and C++ is always 0.

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|00:52
|Here, we see a 2 Dimensional array in a row column matrix. 

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| 00:58
|Starting index is 0.

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|01:01
|Now, let us see how to declare '''2 dimensional array'''.

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| 01:04
|The Syntax for this is: 

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| 01:07
|'''data-type ,array name, row and column.'''

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|01:13
|example, here we have declared a 2 dimensional array '''num''' with 2 rows and 3 columns.

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| 01:21
|Now let us see an example.

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| 01:23
|I have already typed the program, let me open it.

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|01:28
|Note that our file name is '''2d hyphen array dot c'''.

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|01:33
|In this program, we will calculate the sum of the elements of the 2 dimensional array.

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|01:41
|Let me explain the code now.

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|01:44
|This is our '''header file.'''

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|01:46
|This is our '''main()''' function. 

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|01:49
|Here we have declared variables i and j. 

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| 01:53
|Then we have declared num1 with 3 rows and 4 columns. 

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| 01:58
|And num2, again with 3 rows and 4 columns. 

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| 02:03
|num1 and num2 are 2 dimensional arrays.

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| 02:07
|Here, we take elements of the matrix '''num1''' as input from the user. 

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|02:13
|The elements are stored row-wise. 

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|02:16
|We have considered i for rows and j for columns.

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|02:22
|This '''for''' loop will check the condition that i runs from 0 to 2. 

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| 02:28
|This '''for''' loop will check the condition that j runs from 0 to 3. 

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| 02:33
| Similarly, here we take elements of the matrix '''num2''' as input from the user. 

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| 02:40
| Here we display the matrix num1. 

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| 02:43
|  Here percent 3d is used to align the matrix on the terminal.

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| 02:49
| Now, here we display the matrix num2. 

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|02:52
|Then we add the num1 matrix and the num2 matrix and display the result.

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| 02:59
| This is our '''return''' statement. 

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| 03:01
|Now, click on Save.

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| 03:05
| Let us execute the program. 

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| 03:07
|Please open the terminal window by pressing '''Ctrl, Alt''' and '''T''' keys simultaneously on your keyboard. 

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| 03:15
| To compile, type '''gcc''' space '''2d''' hyphen '''array''' dot '''c''' space '''hyphen o''' space''' arr''' and press '''Enter.'''

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| 03:28
|To execute, type '''dot slash arr''' (./arr), now press '''Enter '''.

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| 03:34
|Here we see '''Enter the elements of 3 into 4 array num1'''.

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| 03:39
| I will enter the values now.

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| 03:52
| Now we can see '''Enter the elements of 3 into 4 array num2'''.

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| 03:57
|I will enter the values.

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| 04:10
| The output is displayed.

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| 04:13
|Here we can see the num1 matrix.
 
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| 04:16
|Here we can see the num2 matrix.

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| 04:20
|And this is the sum of num1 and num2.
 
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| 04:24
|Now we will see how to execute the same program in C++.

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| 04:29
|I have already made the program. I will open it and explain.

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| 04:34
|This is the program for '''2 Dimensional arrays''' in C++.

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| 04:38
| Note that our file name is''' 2d hyphen array dot cpp'''.

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| 04:43
|The extension is '''dot cpp''' (.cpp). 

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| 04:47
|Let me explain the code now.

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| 04:50
|This is our header file as '''iostream'''.

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| 04:53
|This is our '''using''' statement. 

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| 04:56
|This is our '''main()''' function.

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| 04:58
|Here we have '''cout''' function as we use '''cout''' to print the output in C++.

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| 05:06
|Then we have '''cin''' function. We use '''cin''' to read  a line in C++.

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| 05:13
|Here, we use  '''/ t ''' bit mean horizontal tab that is equivalent to 4 spaces. 

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| 05:21
|Rest of the code is similar to our C code.

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| 05:25
|Now click on Save.

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| 05:27
|Let us execute. Come back to a terminal. 

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| 05:31
|Let me clear the prompt.

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| 05:33
|To compile, type '''g++ space 2d hyphen array dot cpp  hyphen o space arr1''' and press ''' Enter.''' 

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| 05:47
|To execute, type '''dot slash arr1''', now press Enter.

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| 05:52
|Here we see '''Enter the elements of 3 into 4 array num1.'''

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| 05:57
|I will enter the values.

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| 06:07
|Now, we see '''Enter the elements of 3 into 4 array num2.'''

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| 06:13
|I will give the values as:

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| 06:24
|The output is displayed.

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| 06:26
|We can see the num1 matrix, the num2 matrix.

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| 06:31
|And this is the sum of num1 and num2.

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| 06:36
|This brings us to the end of this tutorial.

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| 06:39
|Come back to our slide. Let us Summarize.

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| 06:43
|In this tutorial we learnt: 

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| 06:45
|To add elements in a 2D array. 

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| 06:48
|To print 2D array. 

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| 06:50
|And to calculate the sum of 2Dimensional array. 

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| 06:54
|As an assignment: Write the  program that takes two 2Dimensional arrays as input from the user. 

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| 07:01
|Subtract them and find the result. 

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| 07:05
|Watch the video available at the link shown below:

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| 07:08
|It summarizes the Spoken Tutorial project. 

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| 07:11
|If you do not have good bandwidth, you can download and watch it. 

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| 07:15
|The Spoken Tutorial Project Team: 

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| 07:17
|Conducts workshops using spoken tutorials. 

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| 07:21
|Gives certificates to those who pass an online test. 

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| 07:25
|For more details, please write to, contact@spoken-tutorial.org. 

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|07:32
|Spoken Tutorial Project is a part of Talk to a Teacher project. 

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| 07:36
|It is supported by the National Mission on Education through ICT, MHRD, Government of India.

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| 07:43
|More information on this mission is available at the link shown below.

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| 07:48
|The script is contributed by Ritwik Joshi. This is Ashwini Patil from IIT Bombay. 

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| 07:54
|Thank you for watching.