C-and-C++/C2/Nested-If-And-Switch-Statement/Gujarati
From Script | Spoken-Tutorial
| Time | Narration |
| 00:01 | Welcome to the spoken tutorial on Nested if & Switch statements in C and C++. |
| 00:07 | In this tutorial we will learn , |
| 00:09 | How to use nested if statement. And |
| 00:12 | switch statement. |
| 00:13 | We will do this with the help of some examples. |
| 00:17 | To record this tutorial, I am using, |
| 00:20 | Ubuntu operating system version 11.10 |
| 00:24 | gcc and g++ Compiler version 4.6.1 on Ubuntu. |
| 00:30 | First we will learn, how to write nested if and switch statement with an example. |
| 00:36 | I have already written the program |
| 00:39 | Let’s have a look |
| 00:40 | In this program ,we will learn to check the range of integers. |
| 00:45 | Note that our file name is nested-if.c |
| 00:50 | Let me explain the code now. |
| 00:52 | This is our Header file.
|
| 00:54 | This is our main function.
|
| 00:56 | Inside the main function we have declared two integer variables 'x and y' |
| 01:02 | Here we prompt the users to enter a number between the range of 0 to 39. |
| 01:08 | we take the value of y as input from the user. |
| 01:12 | This is our if condition |
| 01:14 | Here, we will check whether y/10=0 |
| 01:19 | If the condition is true |
| 01:20 | We print "you have entered a number in the range of 0-9. |
| 01:25 | This is our else-if condition. |
| 01:28 | Here we check that y/10=1. |
| 01:32 | If the condition is true. |
| 01:34 | We print you have entered a number in the range of 10-19. |
| 01:39 | In this else if condition we check whether the number is in the range of 20-29. |
| 01:45 | And here we will see that the number is in the range of 30 to 39. |
| 01:51 | This is our else condition.
|
| 01:53 | 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 of 0-9. |
| 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 programs 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 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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| 11:00 | It is supported by the National Mission on Education through ICT, MHRD, Government of India |
| 11:08 | More information on this Mission is available at: http://spoken-tutorial.org\NMEICT-Intro |
| 11:13 | The script is contributed by Chaitanya Mokashi. This is Ashwini patil from IIT Bombay signing off. Thank you for joining. |
