Difference between revisions of "C-and-C++/C2/Arithmetic-Operators/English-timed"
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Revision as of 17:22, 13 February 2015
| Time | Narration | |
| 00:01 | Welcome to the spoken tutorial on Arithmetic Operators in C And C++. | |
| 00:07 | In this tutorial, we will learn about: | |
| 00:10 | Arithmetic operators like | |
| 00:11 | '+' Addition: e.g. a+b. | |
| 00:14 | '-' Subtraction: e.g. a-b. | |
| 00:18 | '/' Division: e.g. a/b. | |
| 00:20 | '*' Multiplication: e.g. a*b. | |
| 00:24 | '%' Modulus: e.g. a%b. | |
| 00:27 | To record this tutorial, I am using: Ubuntu 11.10 as the operating system | |
| 00:32 | gcc and g++ Compiler version 4.6.1 in Ubuntu. | |
| 00:38 | I will now demonstrate the use of these arithmetic operations with the help of a C program. | |
| 00:44 | I have already written the program. | |
| 00:47 | So, I will open the editor and explain the code. | |
| 00:49 | Here is the C program for arithmetic operators. | |
| 00:56 | In the first two statements, the variables are declared and defined. | |
| 01:02 | In the next two statements, | |
| 01:04 | a is assigned the value of 5. | |
| 01:06 | b is assigned the value of 2. | |
| 01:10 | Now let's see how the addition operator works. | |
| 01:14 | c holds the sum of a and b. | |
| 01:19 | This printf statement displays the sum of a and b on the screen. | |
| 01:28 | Here % dot 2f provides the precision of two digits after the decimal point. | |
| 01:37 | In the next statement, c holds the product of a and b. | |
| 01:43 | This printf statement displays the product of a and b on the screen. | |
| 01:48 | Let's see how these two operators work. | |
| 01:52 | We will comment out the following lines. | |
| 01:55 | Type /* (slash asterisk) | |
| 02:01 | */ | |
| 02:05 | Click on Save. | |
| 02:07 | Save the file with extension .c (dot c). | |
| 02:10 | I have saved my file as arithmetic.c. | |
| 02:15 | Open the terminal window by pressing Ctrl, Alt and T keys simultaneously. | |
| 02:22 | To compile the code, type the following on the terminal. | |
| 02:27 | gcc space arithmetic dot c space minus o space arith | |
| 02:38 | Press Enter. | |
| 02:40 | To execute the code, type ./arith (dot slash arith). | |
| 02:48 | press Enter. | |
| 02:50 | The output is displayed on the screen. | |
| 02:53 | It shows, | |
| 02:54 | Sum of 5 and 2 is 7.00 and | |
| 02:59 | Product of 5and 2 is 10.00. | |
| 03:03 | Now you should try the subtraction operator on your own. | |
| 03:08 | Try replacing the addition operator with subtraction operator. | |
| 03:13 | You should get the result as 3. | |
| 03:18 | Coming back to the program and the last set of statements. | |
| 03:23 | Now, I will explain the code for division. | |
| 03:26 | Remove the multiline comments here and here. | |
| 03:34 | In these statements, c holds the value of integer division of a by b. | |
| 03:40 | Please note that in integer division the fractional part is truncated. | |
| 03:47 | The printf statement displays the division output on the screen. | |
| 03:57 | In this statement we are performing real division. | |
| 04:02 | Here one of the operands has to be cast as float. | |
| 04:10 | We have type-cast variable a. | |
| 04:13 | Now a will behave as a float variable for a single operation. | |
| 04:22 | The printf statement displays the output of real division on the screen. | |
| 04:30 | Type return 0; and close the ending curly bracket. | |
| 04:37 | Click on Save. | |
| 04:40 | Coming back to the terminal to compile and execute the code. | |
| 04:45 | To compile, typegcc space arithmetic dot c minus o space arith. Press Enter. | |
| 04:59 | To execute the code, type ./arith. Press Enter. | |
| 05:05 | The output is displayed on the screen. | |
| 05:08 | We have the previous outputs of addition and multiplication operators. | |
| 05:16 | We have the integer Division of 5 by 2 is 2. | |
| 05:22 | We can see that in integer division the fractional part is truncated. | |
| 05:29 | Then we have the real division of 5 by 2 is 2.5. | |
| 05:35 | In real division, the result is as expected. | |
| 05:37 | We used type-casting to obtain these results. | |
| 05:45 | Now suppose, I want to write the same program in C++. | |
| 05:50 | Let's see if I can use the same code in C++ too? | |
| 05:54 | Let's find out. | |
| 05:56 | Let me go back to the editor. | |
| 06:00 | Here is a C++ code. | |
| 06:05 | Notice that the header is different from the C file header. | |
| 06:12 | namespace is also used here. | |
| 06:18 | Also, notice that the output statement in C++ is cout. | |
| 06:25 | So, apart from these differences, the two codes are very similar. | |
| 06:32 | Click on Save. | |
| 06:33 | Make sure the file is saved with the extension .cpp. | |
| 06:37 | I have saved my file as arithmetic.cpp. | |
| 06:41 | Let's execute the code and see what results we get. | |
| 06:49 | Open the terminal and type g++ space arithmetic dot cpp space minus o arith . Press Enter. | |
| 07:09 | To execute the code, type ./ arith. Press Enter. | |
| 07:16 | Here the output is displayed. | |
| 07:19 | So, we see that the results are similar to the C program. | |
| 07:23 | The only difference is in the precisions of outputs. | |
| 07:29 | Let us now summarize the tutorial. | |
| 07:32 | In this tutorial we learnt how to use the arithmetic operators. | |
| 07:36 | As an assignment: | |
| 07:38 | Write a program to demonstrate the use of modulus operator. | |
| 07:42 | Please note that Modulus operator finds the remainder of division. e.g. c = a % b; | |
| 07:50 | You should obtain the result as 1. | |
| 07:55 | Watch the video available at the following link. | |
| 07:57 | It summarizes the Spoken Tutorial project. | |
| 08:00 | If you do not have good bandwidth, you can download and watch it. | |
| 08:05 | The Spoken Tutorial Project Team: Conducts workshops using spoken tutorials. | |
| 08:09 | Gives certificates to those who pass an online test. | |
| 08:14 | For more details, please write to contact at spoken hyphen tutorial dot org. | |
| 08:20 | Spoken Tutorial Project is a part of the Talk to a Teacher project. | |
| 08:25 | It is supported by the National Mission on Education through ICT, MHRD, Government of India. | |
| 08:30 | More information on this Mission is available at | |
| 08:33 | spoken hyphen tutorial dot org slash NMEICT hyphen Intro | |
| 08:41 | This is Ritwik Joshi from IIT Bombay.
Thank you for joining. |
