Difference between revisions of "C-and-C++/C2/Arithmetic-Operators/English-timed"
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Revision as of 12:32, 8 November 2013
| Time' | Narration
| |
| 00.02 | Welcome to the spoken tutorial on Arithmetic Operators in C 'C++'. | |
| 00.08 | In this tutorial, we will learn about | |
| 00.10 | Arithmetic operators like
+ Addition: eg. a+b. - Subtraction: eg. a-b. / Division: eg. a/b. * Multiplication: eg. a*b. % Modulus: eg. a%b. | |
| 00.28 | To record this tutorial, I am using:Ubuntu 11.10 as the operating system | |
| 00.33 | gcc and g++ Compiler version 4.6.1 in Ubuntu. | |
| 00.39 | I will now demonstrate the use of these arithmetic operations with the help of a C program. | |
| 00.45 | I have already written the program. | |
| 00.47 | So I will open the editor and explain the code. | |
| 00.50 | Here is the C program for arithmetic operators. | |
| 00.57 | the first two statements the variables are declared and defined. | |
| 01.03 | In the next two statements, | |
| 01.05 | a is assigned the value of 5. | |
| 01.07 | b is assigned the value of 2. | |
| 01.11 | Now let's see how the addition operator works. | |
| 01.15 | c holds the sum of a and b. | |
| 01.19 | This printf statement displays the sum of a and b on the screen. | |
| 01.29 | Here %.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. | |
| 01.49 | Let's see how these two operators work. | |
| 01.53 | We will comment out the following lines | |
| 01.56 | Type /* */ | |
| 02.05 | Click on 'Save | |
| 02.08 | Save the file with extension .c | |
| 02.11 | I have saved the file as arithmetic.c | |
| 02.15 | Open the terminal window by pressing Ctrl, Alt and T keys simultaneously. | |
| 02.23 | To compile the code, type the following on the terminal. | |
| 02.27 | gcc arithmetic.c -o arith | |
| 02.38 | Press Enter | |
| 02.41 | To execute the code, type ./arith | |
| 02.48 | press Enter | |
| 0250 | 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 | |
| 03.05 | Now you should try the subtraction operator on your own | |
| 03.09 | Try replacing the addition operator with subtraction operator. | |
| 03.14 | You should get the result as 3. | |
| 03.19 | 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 multi line comments from here and here. | |
| 03.35 | In these statements, c holds the value of integer division of a by b. | |
| 03.41 | Please note that in integer division the fractional part is truncated. | |
| 03.47 | The printf statement displays the division output on the screen. | |
| 03.58 | 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. | |
| 04.14 | Now a will behave as a float varible for a single operation.
| |
| 04.24 | The printf statement displays the output of real division on the screen.
| |
| 04.31 | 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 arithmetic.c -o arith. Press Enter | |
| 04.59 | To execute the code, type ./arithPress Enter
| |
| 05.05 | The output is displayed on the screen: | |
| 05.08 | We have the previous outputs of addition and multiplication operators. | |
| 05.17 | we have the integer Division of 5 by 2 is 2.
| |
| 05.22 | We can see that in integer division fractional part is truncated.
| |
| 05.29 | then we have the real division of 5 by 2 is 2.50. | |
| 05.35 | In real division the result is as expected. | |
| 05.38 | We used type-casting to obtain these result. | |
| 05.45 | Now suppose, I want to write the same program in C++. | |
| 05.50 | Let see if i can use the same code in C++, too? | |
| 05.55 | Let's find out. | |
| 05.56 | Let me go back to the editor. | |
| 06.01 | Here is a C++ code. | |
| 06.05 | Notice that the header is different from the C file header. | |
| 06.13 | namespace is also used here. | |
| 06.19 | 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 | |
| 06.42 | Let's execute the code and seewhat results we get. | |
| 06.49 | Open the terminal and type g++ arithmetic.cpp -o arith .'Press Enter | |
| 07.09 | To execute the code Type ./ arithPress Enter
| |
| 07.17 | Here the output is displayed: | |
| 07.19 | So, we see that the results are similar to C program. | |
| 07.23 | The only difference is in the precisions of outputs. | |
| 07.30 | Let us now summarize the tutorial. | |
| 07.32 | In this tutorial we learnt how to use the arithmetic operators. | |
| 07.37 | As an assignment: | |
| 07.38 | Write a program to demonstrate the use of modulus operator. | |
| 07.43 | Please note that Modulus operator finds the remainder of division. eg. c = a % b; | |
| 07.51 | You should obtain the result as 1. | |
| 07.55 | Watch the video available at the following link | |
| 07.58 | It summarises the Spoken Tutorial project | |
| 08.01 | 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 | |
| 08.10 | Gives certificates for those who pass an online test | |
| 08.14 | For more details, please write to contact at spoken hyphen tutorial dot org
| |
| 08.21 | 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 | |
| 08.31 | 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. |
