C-and-C++/C2/Arithmetic-Operators/English-timed

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.
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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.

Contributors and Content Editors

Ashwini, Krupali, PoojaMoolya, Pratik kamble, Sandhya.np14