Difference between revisions of "C-and-C++/C3/Arrays/English-timed"
From Script | Spoken-Tutorial
PoojaMoolya (Talk | contribs) |
PoojaMoolya (Talk | contribs) |
||
| Line 2: | Line 2: | ||
|Time | |Time | ||
| − | |||
|Narration | |Narration | ||
| − | |||
|- | |- | ||
Revision as of 14:51, 23 June 2014
| Time | Narration |
| 00:01 | Welcome to the spoken-tutorial on Arrays in C and C++. |
| 00:07 | In this tutorial we will learn, |
| 00:09 | What is an array. |
| 00:11 | Declaration of an array. |
| 00:13 | Initialization of an array. |
| 00:16 | Few Examples on array |
| 00:18 | We will also see some common errors and their solutions. |
| 00:22 | To record this tutorial, I am using, |
| 00:25 | Ubuntu Operating System version 11.04 |
| 00:30 | gcc and g++ Compiler version 4.6.1 .
|
| 00:36 | Let us start with the introduction to Array. |
| 00:39 | Array is the collection of data or elements of same data-type. |
| 00:44 | Array index starts from 0. |
| 00:48 | The first element is stored at index 0. |
| 00:52 | There are three types of arrays: |
| 00:55 | Single dimensional array. |
| 00:57 | Two dimensional array and |
| 00:59 | Multi-dimensional array. |
| 01:01 | We will be discussing single dimensional array in this tutorial. |
| 01:06 | Let us see how to declare single dimensional array. |
| 01:09 | The Syntax for this is: |
| 01:11 | data-type name of the array and size |
| 01:16 | example, here we have declare an integer array star which contain 5 elements |
| 01:24 | The array index will start from star 0 to star 4 |
| 01:29 | We saw the declaration of an array
|
| 01:32 | Now, we will see the initialize of an array. |
| 01:35 | The Syntax for this is: |
| 01:38 | data-type,( name of the array ), size is equal to elements
|
| 01:44 | example, here we have declared an integer array star with size 3. The elements of the array are 1,2 and 3 |
| 01:54 | Here the index will start from star 0 to star 2 |
| 01:59 | Now, lets us move to the examples |
| 02:01 | I have already typed the program on the editor. |
| 02:04 | So, let me open it. |
| 02:06 | Please,note that our file name is array.c
|
| 02:10 | In this program, we will calculate the sum of the elements stored in an array. |
| 02:16 | Let me explain the code now |
| 02:18 | This is our header file.
|
| 02:20 | This is our main function.
|
| 02:22 | Here, we have declared and initialized an array star with size 3. |
| 02:28 | The elements of the array are 4, 5 and 6 |
| 02:33 | Then we have declared an integer variable sum |
| 02:36 | Here we add the elements of the array and store the result in sum. |
| 02:41 | Note that 4 will be store at index 0, 5 will be store at index 1 and 6 will be store at index 2 |
| 02:50 | Then we print the sum. |
| 02:52 | This is our return statement. |
| 02:54 | Now, click on Save. |
| 02:57 | Let us execute the program. |
| 02:59 | Please open the terminal window by pressing Ctrl, Alt and T keys simultaneously on your keyboard. |
| 03:09 | To compile type, gcc space array dot c space hypen o array and press Enter. |
| 03:19 | To execute type, dot slash array .Press Enter |
| 03:24 | Here the output is displayed as, |
| 03:26 | The sum is 15. |
| 03:28 | Now let us see some common errors which we can come accross.
|
| 03:32 | Come back to our program. |
| 03:34 | Suppose here, at line number 4 we miss the curly brackets. |
| 03:39 | Click on Save. Let us see what happens |
| 03:42 | Come back to the terminal. |
| 03:44 | Let us compile as before. |
| 03:47 | We see an error |
| 03:49 | Invalid initializer and Expected identifier or bracket before numeric constant. |
| 03:56 | This is because arrays must be initialized within curly brackets. |
| 04:01 | Come back to our program. Let us fix the error. |
| 04:04 | Type the curly brackets here at line number 4. |
| 04:09 | Now, click on Save |
| 04:12 | Lets us execute. Come back to the terminal |
| 04:15 | Let us compile as before. Let us execute as before.
|
| 04:19 | Yes,it is working
|
| 04:21 | Now we will execute the same program in C++. |
| 04:25 | Come back to our program. |
| 04:28 | I will change a few things here. |
| 04:30 | First press Shift , Ctrl and S keys simultaneously on your keyboard |
| 04:38 | Now save the file with the extension dot cpp and click on Save |
| 04:44 | Let us change the header file as iostream |
| 04:49 | Now include the using statement |
| 04:55 | The declaration and initialization of an array is same in C++ |
| 05:01 | Hence no need to change anything here |
| 05:04 | Now replace the printf statement with the cout statement. |
| 05:09 | Delete the format specifier and back slash n, now delete the comma and type two opening angle brackets |
| 05:17 | Delete the bracket here. Again type two opening angle brackets and within the double quotes type back slash n |
| 05:26 | Now click on Save. |
| 05:29 | Let us execute. Come back to a terminal. |
| 05:32 | To compile type, g++ space array dot cpp space hypen o space array1. |
| 05:42 | Here we have array1 because we dont want to overwrite the output parameter array for the file array dot c |
| 05:51 | Now press Enter. |
| 05:54 | To execute type, dot slash array1 .Press Enter |
| 05:59 | The output is displayed as, The sum is 15 |
| 06:02 | We can see that it is similar to our C code |
| 06:07 | Now, we will see another common error.
|
| 06:10 | Come back to our program |
| 06:12 | Suppose here, at line number 7 |
| 06:14 | I will type star[1], star[2] and star[3]; |
| 06:23 | Click on Save. |
| 06:24 | Let us execute. Come back to our terminal |
| 06:28 | Let me clear the prompt. |
| 06:30 | Let us compile as before. |
| 06:33 | Let us execute as before. |
| 06:36 | We get an unexpected output.
|
| 06:39 | This is because array index starts from 0. |
| 06:43 | Come back to our program. We can see here the array index starts from one. |
| 06:49 | Hence it is giving an error. Let us fix the error. |
| 06:54 | Type 0 here 1 and 2. Click on Save |
| 07:02 | Let us execute. Come back to our terminal |
| 07:05 | Let us compile as before. Execute as before |
| 07:09 | Yes, it is working. |
| 07:12 | Now, we will go back to our slides |
| 07:14 | Le us summarize |
| 07:16 | In this tutorial we learned,
|
| 07:19 | Arrays. |
| 07:20 | To declare Single Dimensional Arrays. |
| 07:23 | To initialize Single Dimensional Arrays.
|
| 07:26 | example int star[3]={4, 5, 6} |
| 07:31 | To add the element of the array, example sum is equal to star 0 plus star 1 plus star 2 |
| 07:40 | As an assignment, |
| 07:41 | Write a program to calculate the difference of the elements stored in an array.
|
| 07:47 | Watch the video available at the link shown below |
| 07:50 | It summarizes the Spoken Tutorial project |
| 07:53 | If you do not have good bandwidth, you can download and watch it |
| 07:57 | The Spoken Tutorial Project Team |
| 08:00 | Conducts workshops using spoken tutorials |
| 08:03 | Gives certificates to those who pass an online test |
| 08:06 | For more details, please write to, contact@spoken-tutorial.org |
| 08:13 | Spoken Tutorial Project is a part of Talk to a Teacher project |
| 08:17 | It is supported by the National Mission on Education through ICT, MHRD, Government of India
|
| 08:25 | More information on this Mission is available at the link shown below |
| 08:30 | This is Ashwini Patil from IIT Bombay signing off |
| 08:33 | Thank You for watching. |
