C-and-C++/C2/Nested-If-And-Switch-Statement/Gujarati

Time	Narration
00:01	Welcome to the spoken tutorial on Nested if & Switch statements in C and C++.
00:08	In this tutorial we will learn ,
00:11	How to use nested if statement. And
00:14	switch statement.
00:16	We will do this with the help of an examples.
00:20	To record this tutorial, I am using,
00:23	Ubuntu operating system version 11.10
00:27	gcc and g++ Compiler version 4.6.1 on Ubuntu.
00:34	First we will learn, how to write nested if and switch statement with an example.
00:42	I have already written the program
00:44	Let’s have a look
00:49	In this program ,we will learn to check the range of integers.
00:53	Note that our file name is nested-if.c
01:00	Let me explain the code now.
01:03	This is our Header file.
01:05	This is our main function.
01:07	Inside the main function we have declared two integer variable 'x and y'
01:16	Here we prompt the users to enter a number between the range of 0 to 39.
01:23	we take the value of y as input from the user.
01:30	This is our if condition
01:32	Here, we will check whether y/10=0
01:36	If the condition is true
01:38	We print "you have entered a number in the range of 0-9.
01:47	This is our else-if condition.
01:50	Here we check that y/10=1.
01:54	If the condition is true.
01:56	We print you have entered a number in the range of 10-19.
02:03	In this else if condition we check whether the number is in the range of 20-29.
02:11	And here we will see that the number is in the range of 30 to 39.
02:19	This is our else condition.
02:21	If all of the above conditions are false
02:24	We print number not in range.
02:28	And this is our return statement
02:31	Now let us execute the program.
02:35	Please open the terminal window , by pressing Ctrl+Alt+T keys simultaneously on your keyboard.
02:45	To execute , Type “gcc” space “nested-if.c” space hyphen “-o” space “nested”. Press Enter
02:57	type dot slash “./nested”. Press Enter
03:01	We see,Enter a number between 0 to 39.
03:06	I will Enter 12
03:09	The output is displayed as:
03:11	you have entered the number in the range of 10-19.
03:17	Let us enter another number.
03:21	Let's execute again. Press the up arrow key, press enter.
03:28	I will give 5 this time.
03:34	We see the output as :
03:35	you have entered the number in the range of 0-9.
03:42	The conditional execution can also be done in another way.
03:46	By using switch statement.
03:49	Let’s see how it is done.
03:51	We will see the same program using switch.
03:57	I have already opened the program.
03:59	Let's switch back to our text editor
04:07	I have explained this in the previous program.
04:11	So i will move on to the Switch statements
04:16	Here, we divide the inputs i.e y by 10 and the result is stored in the variable x.
04:24	That means the quotient will be stored in x.
04:28	With the help of the quotient we can identify the range of the number.
04:37	Here, we tell the switch command that the variable to be checked is x.
04:47	This is case 0 . If case 0 is satisfied.
04:50	Then we print you have entered the number in the range of0-9.
04:58	We add break to come out of the loop if the case is satisfied.
05:03	We need to break the loop each time.
05:05	It is because only one condition can be true at a time.
05:11	This is “case 1” . “case 1” means “if the value of x is 1”
05:17	We print you have entered a number in the range of 10-19.
05:24	This is “case 2” .
05:26	Here we print you have entered a number in the range of 20-29.
05:33	And this is case 3. Here we check whether the number is in the range of 30-39.
05:43	This is the default case. Default case specifies what needs to be done if none of the above cases are satisfied.
05:52	Here we print number not in range.
05:57	And This is our return statement.
05:59	Let us execute the program.
06:02	Switch back to the terminal.
06:06	Type:gcc switch.c -o switch. Press Enter
06:16	Type:./switch. Press Enter
06:21	Enter a number between of 0 to 39. I willl enter 35
06:28	The output is displayed as,“you have entered the number in the range of 30 to 39”.
06:35	Now we will see how to execute the program in C++.
06:44	Switch back to the text editor.
06:47	Note that our filename is nested-if.cpp
06:55	Here the logic and implementation are same
06:59	There are a few changes like:
07:03	The header file as iostream in place of stdio.h
07:08	Here we have included the using statement.
07:11	Using namespace std
07:14	And the cout and cin function in place of printf and scanf.
07:23	You can see that the rest of the code is similar to our C program.
07:29	Let’s execute the code.
07:31	Come back to the terminal.
07:34	Type: g++ nested-if.cpp -o nested1. Press Enter.
07:45	Type: ./nested1. Press Enter
07:50	enter a number between 0 and 39. I will enter 40.
07:53	The output is displayed as: “number not in range”
08:06	Now let’s see the switch program in C++
08:10	Come back to the text editor.
08:14	Here also the logic and implementation are same.
08:19	You can see that the header file is iostream
08:23	Here is the using statement.
08:25	And we have changed the cout and cin function.
08:33	Rest of the code is similar to our switch.c C program
08:38	Let us execute.
08:40	Come back to the terminal.
08:42	Type:g++ switch.cpp -o switch1 Press Enter
08:52	Type ./switch1. Press Enter
08:57	Enter a number between 0 and 39.
09:00	I will enter 25.
09:04	The output is displayed as:
09:06	“you have entered the number in the range of 20-29”
09:11	Now let us switch back to our slides.
09:16	We will see the comparison between switch and nested-if statement.
09:21	Switch statement is evaluated according to the result of the expression.
09:28	Netsed-if statement is run only if the result of the expression is true.
09:35	In switch we treat various values of the variable as cases.
09:41	In nested-if we have to write the conditional statement for each value of the variable.
09:49	Switch statement can only check the integer values
09:54	Nested if can check for both integer and fractional values.
10:00	This brings us to the end of this tutorial.
10:03	Let us summarize.
10:05	In this tutorial we learnt, nested if statement. Ex: else if( y/10==0)
10:13	switch statement. e.g. Switch(x)
10:16	And Difference between nested-if and switch statements.
10:22	As an assignment,
10:23	Write a program to check whether the age of the employee is between 20 to 60.
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11:13	The script is contributed by Chaitanya Mokashi. This is Ashwini patil from IIT Bombay signing off. Thank you for joining.

Contributors and Content Editors

Jyotisolanki, Krupali, Pratik kamble