Difference between revisions of "C-and-C++/C3/Working-With-2D-Arrays/English-timed"

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

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

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|In this tutorial we will learn,   

|In this tutorial we will learn,   

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|What is a 2Dimensional '''array.'''

|What is a 2Dimensional '''array.'''

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|We will do this through an example.  

|We will do this through an example.  

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|To record this tutorial, I am using  

|To record this tutorial, I am using  

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| ''Ubuntu Operating System''' version 11.10,  

| ''Ubuntu Operating System''' version 11.10,  

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|'''gcc''' and '''g++ Compiler''' version 4.6.1 on Ubuntu  

|'''gcc''' and '''g++ Compiler''' version 4.6.1 on Ubuntu  

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| Let us start with the introduction to '''2 dimensional Array'''

| Let us start with the introduction to '''2 dimensional Array'''

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|'''2-D arrays''' are stored in a row column matrix.

|'''2-D arrays''' are stored in a row column matrix.

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| The left index indicates the row.

| The left index indicates the row.

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|The right index indicates the column.  

|The right index indicates the column.  

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|Starting index of a matrix or array in C and C++ is always 0

|Starting index of a matrix or array in C and C++ is always 0

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|Here we see a 2 Dimensional array in a row column matrix  

|Here we see a 2 Dimensional array in a row column matrix  

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|Starting index is 0

|Starting index is 0

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

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

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|The Syntax for this is:  

|The Syntax for this is:  

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

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

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|example, here we have declare a 2 Dimensional array num with 2 rows and 3 columns

|example, here we have declare a 2 Dimensional array num with 2 rows and 3 columns

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|Now let us see an example.

|Now let us see an example.

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

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

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|Note that our file name is '''2d hyphen array dot c'''

|Note that our file name is '''2d hyphen array dot c'''

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|In this program we will calculate the sum of the elements of the 2 Dimensional array.

|In this program we will calculate the sum of the elements of the 2 Dimensional array.

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|Let me explain the code now.

|Let me explain the code now.

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|This is our '''header file.'''

|This is our '''header file.'''

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|This is our '''main function. '''

|This is our '''main function. '''

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|Here, we have declared variable i and j.  

|Here, we have declared variable i and j.  

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|Then we have declared num1 with 3 rows and 4 columns  

|Then we have declared num1 with 3 rows and 4 columns  

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|And num2 again with 3rows and 4columns  

|And num2 again with 3rows and 4columns  

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|num1 and num2 are 2 Dimensional array

|num1 and num2 are 2 Dimensional array

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|Here we take elements of the matrix '''num1''' as input from the user.  

|Here we take elements of the matrix '''num1''' as input from the user.  

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|The elements are stored row-wise.  

|The elements are stored row-wise.  

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|We have considered i for rows and j for columns.

|We have considered i for rows and j for columns.

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

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

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

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

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| Similarly,Here we take elements of the matrix '''num2''' as input from the user.  

| Similarly,Here we take elements of the matrix '''num2''' as input from the user.  

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| Here we display the matrix num1  

| Here we display the matrix num1  

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

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

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| Now,here we display the matrix num2  

| Now,here we display the matrix num2  

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

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

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| This is our return statement.  

| This is our return statement.  

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|Now, click on Save.

|Now, click on Save.

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| Let us execute the program.  

| Let us execute the program.  

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

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

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

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

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|To execute type, '''dot slash arr''', now press '''Enter '''

|To execute type, '''dot slash arr''', now press '''Enter '''

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|Here we see '''Enter the elements of 3 into 4 array num1'''

|Here we see '''Enter the elements of 3 into 4 array num1'''

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| I will enter the values now.

| I will enter the values now.

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| Now we can see '''enter the elements of 3 into 4 array num2'''

| Now we can see '''enter the elements of 3 into 4 array num2'''

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|I will enter the values

|I will enter the values

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| The output is displayed.

| The output is displayed.

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|Here we can see the num1 matrix

|Here we can see the num1 matrix

   

   

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|Here we can see the num2 matrix

|Here we can see the num2 matrix

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|And this is the sum of num1 and num2

|And this is the sum of num1 and num2

   

   

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|Now we will see how to execute the same program in C++

|Now we will see how to execute the same program in C++

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

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

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|This is the program for '''2 Dimensional arrays''' in C++

|This is the program for '''2 Dimensional arrays''' in C++

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| Note that our file name is''' 2D hyphen array dot cpp'''

| Note that our file name is''' 2D hyphen array dot cpp'''

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|The extension is dot '''cpp.'''

|The extension is dot '''cpp.'''

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|Let me explain the code now

|Let me explain the code now

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|This is our header file as '''iostream'''

|This is our header file as '''iostream'''

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|This is our '''using statement'''.  

|This is our '''using statement'''.  

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|This is our '''main''' function

|This is our '''main''' function

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

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

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

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

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

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

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|Rest of the code is similar to our C code.

|Rest of the code is similar to our C code.

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|Now click on Save

|Now click on Save

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|Let us execute  

|Let us execute  

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|Come back to a terminal  

|Come back to a terminal  

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|Let me clear the prompt

|Let me clear the prompt

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|To comple type, '''g++ space 2D hypen array dot cpp  hyphen o space arr1''' and press''' Enter.'''  

|To comple type, '''g++ space 2D hypen array dot cpp  hyphen o space arr1''' and press''' Enter.'''  

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

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

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

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

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|I will enter the values

|I will enter the values

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

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

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|I wil give the values as

|I wil give the values as

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|The output is displayed

|The output is displayed

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|We can see the num1 matrix, the num2 matrix.

|We can see the num1 matrix, the num2 matrix.

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|And this is the sum of num1 and num2.

|And this is the sum of num1 and num2.

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|This brings us to the end of this tutorial

|This brings us to the end of this tutorial

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|Come back to our slide. Let us Summarize

|Come back to our slide. Let us Summarize

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|In this turoial we learnt,  

|In this turoial we learnt,  

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|To add elements in a 2D array.  

|To add elements in a 2D array.  

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|To print 2D array.  

|To print 2D array.  

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|And,to calculate the sum of 2Dimensional array.  

|And,to calculate the sum of 2Dimensional array.  

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|As an assignment,

|As an assignment,

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| Write the  program that takes two 2Dimensional arrays as input from the user.  

| Write the  program that takes two 2Dimensional arrays as input from the user.  

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|Subtract them and find the result.  

|Subtract them and find the result.  

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|-

|Watch the video available at the link shown below

|Watch the video available at the link shown below

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|-

|It summarizes the Spoken Tutorial project  

|It summarizes the Spoken Tutorial project  

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|-

|If you do not have good bandwidth, you can download and watch it  

|If you do not have good bandwidth, you can download and watch it  

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|-

|The Spoken Tutorial Project Team  

|The Spoken Tutorial Project Team  

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|-

|Conducts workshops using spoken tutorials  

|Conducts workshops using spoken tutorials  

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|-

|Gives certificates to those who pass an online test  

|Gives certificates to those who pass an online test  

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|-

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

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

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|-

|Spoken Tutorial Project is a part of Talk to a Teacher project  

|Spoken Tutorial Project is a part of Talk to a Teacher project  

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|-

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

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

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|-

|More information on this Mission is available at the link shown below

|More information on this Mission is available at the link shown below

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|-

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

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

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|-

|Thank you for watching.

|Thank you for watching.