Java/C2/Relational-Operations/English-timed
From Script | Spoken-Tutorial
| Time' | Narration | ||
| 00:02 | Welcome to the spoken tutorial on Relational Operators in C and C++. | ||
| 00:07 | In this tutorial, we will learn about: | ||
| 00;09 | Relational operators like | ||
| 00:12 | Less than: eg. a < b | ||
| 00:15 | Greater than: eg. a > b | ||
| 00:18 | Less than or equal to: eg. a <= b | ||
| 00:23 | Greater than or equal to: eg. a >= b | ||
| 00:28 | Equal to: eg. a == b | ||
| 00:31 | Not equal to: eg. a != b | ||
| 00:38 | To record this tutorial, I am using: Ubuntu 11.10 as the operating system | ||
| 00:43 | gcc and g++ Compiler version 4.6.1 in Ubuntu.
| ||
| 00:50 | Let us begin with an introduction. | ||
| 00:53 | Relational operators are used to compare integer and floating point numbers. | ||
| 00:58 | Expressions using relational operators return 0 for false and 1 for true.
Return values: 0 when False 1 when True | ||
| 01:04 | Now I will demonstrate the relational operators with the help of a C program. | ||
| 01:10 | I have already made the program. | ||
| 01:11 | So, I'll open the editor and explain the code. | ||
| 01:16 | First, we declare two variables a and b. | ||
| 01:21 | This printf statement prompts the user to enter the values of a and b. | ||
| 01:27 | This scanf statement takes input for the variables a and b. | ||
| 01:33 | Now we have the greater than operator. | ||
| 01:35 | This operator compares the two operands on either side of the operator. | ||
| 01:39 | It returns' False if a is greater than b. | ||
| 01:44 | This printf statement is executed if the above condition is true. | ||
| 01:48 | If the above condition is false then it is skipped. | ||
| 01:51 | To control then jumps to the next statement. | ||
| 01:54 | We now have the less than operator. | ||
| 01:56 | This too compares the operands. | ||
| 01:58 | It returns true when a is less than b. | ||
| 02:03 | This printf statement is executed if the above condition is true. | ||
| 02:07 | It is skipped otherwise. | ||
| 02:09 | Let's execute the code till here. | ||
| 02:13 | First comment out the following. Type /* */ | ||
| 02:24 | Click on Save. | ||
| 02:26 | I have saved my file as relational.c | ||
| 02:30 | Open the terminal window by pressing Ctrl, Alt and T keys simultaneously. | ||
| 02:36 | To compile, type the following on the terminal gcc relational.c -o rel | ||
| 02:50 | Press Enter. | ||
| 02:52 | To execute type ./rel Press Enter.
| ||
| 02:58 | I enter a as 8 and b as 3. | ||
| 03:02 | The output is displayed: | ||
| 03:04 | 8 is greater than 3. | ||
| 03:07 | You can try executing this code with different values of a and b. | ||
| 03:12 | Coming back to the code. | ||
| 03:14 | Delete the comment from here and put it here.
| ||
| 03:24 | Now we have the less than or equal to operator. | ||
| 03:29 | This operator compares the two operands on either side of the operator. | ||
| 03:33 | It returns true if a is less than or equal to b. | ||
| 03:39 | This printf statement is executed if the above condition is true. | ||
| 03:43 | If the above condition is false then it is skipped. | ||
| 03:46 | The control then jumps to the next statement. | ||
| 03:50 | Next comes the greater than or equal to operator. | ||
| 03:53 | It compares a and b and returns true if a is greater than or equal to b. | ||
| 04:01 | If the condition is true then this printf statement will be executed. | ||
| 04:05 | Now let's execute the code till here. | ||
| 04:08 | Click on Save. | ||
| 04:10 | Switch back to the terminal. | ||
| 04:12 | Compile and execute as before.
| ||
| 04:17 | I enter a as 8 and b as 3. | ||
| 04:23 | The output is displayed: | ||
| 04:25 | 8 is greater than or equal to 3 | ||
| 04:30 | Now Coming back to rest of the code. | ||
| 04:33 | Delete the multiline comments from here ands here. | ||
| 04:43 | we now have the equal to operator. | ||
| 04:47 | It is denoted by double equal (==) signs. | ||
| 04:50 | This operator returns true when both operands are equal to one another. | ||
| 04:57 | This printf statement executes when a is equal to b. | ||
| 05:01 | If not, the control then jumps on to the next statement. | ||
| 05:06 | Similarly, we have the not equal to operator. | ||
| 05:09 | This operator returns true when the operands are not equal to one another. | ||
| 05:15 | This printf statment will execute when a is not equal to b. | ||
| 05:21 | Coming to the end of the program.
Return 0; | ||
| 05:24 | Click on Save. | ||
| 05:26 | Switch back to the terminal. | ||
| 05:28 | Compile and execute as before.
| ||
| 05:33 | Enter a as 8 and b as 3. | ||
| 05:39 | The output is displayed on the screen: | ||
| 05:41 | 8 is not equal to 3 | ||
| 05:45 | So, we see how the relational operaotors work. | ||
| 05:48 | Try executing this code with different set of inputs. | ||
| 05:52 | \Now, writing a smilar program in C++ is quite easy. | ||
| 05:56 | There are a few differences in the syntax. | ||
| 06:00 | I have already made the code in C++. | ||
| 06:04 | Their is the code for relational operators in C++. | ||
| 06:09 | Notice that the header is different. | ||
| 06:12 | Also we have the using statement here. | ||
| 06:16 | The output statement in C++ is cout. | ||
| 06:19 | And the input statement in C++ is cin. | ||
| 06:22 | So, apart from these differences, the two codes are very similar. | ||
| 06:27 | Click on save. | ||
| 06:29 | Please make sure the file is saved with the extension .cpp | ||
| 06:33 | I have saved my file as relational.cpp | ||
| 06:38 | Let's compile the code. | ||
| 06:40 | Open the terminal and type g++ relational.cpp -o rel1 | ||
| 06:51 | To execute Type './ rel1, Press Enter.
| ||
| 06:57 | I enter a as 8 and b as 3. | ||
| 07:01 | The output is displayed: | ||
| 07:03 | We see that the output is same as the one in C code. | ||
| 07:08 | Now let us see an error which we can come across. | ||
| 07:11 | Come back to the program | ||
| 07:13 | Suppose here we replace the double equal to sign with the single equal to. | ||
| 07:20 | Click on Save. | ||
| 07:21 | Come back to the terminal. | ||
| 07:24 | Compile and execute as before. | ||
| 07:34 | Here we see it is showing 3 is equal to 3. | ||
| 07.38 | Come back to our program | ||
| 07:40 | This is because here we have an assignment operator. | ||
| 07:44 | So value of b is assigned to a. | ||
| 07:47 | Now Let us fix this error. | ||
| 07:49 | Type an equal to sign. | ||
| 07:52 | Click on Save | ||
| 07:55 | Switch back to the terminal | ||
| 07:56 | compile and execute as before. | ||
| 08:04 | The output is now correct. | ||
| 08:06 | Let's summarize the tutorial. | ||
| 08:09 | In this tutorial, we learnt | ||
| 08:10 | Relational operators like | ||
| 08:12 | Less than: eg. a b | ||
| 08:18 | Less than or equal to: eg. a<=b | ||
| 08:23 | Greater than or equal to: eg. a>=b | ||
| 08:27 | Equal to: eg. a==b | ||
| 08:30 | Not equal to: eg. a!=b | ||
| 08:34 | As an assignment | ||
| 08:35 | Write a program that takes the marks of three students as input. | ||
| 08:40 | Compare the marks to see which student has scored the highest. | ||
| 08:44 | Check also if two or more students have scored equal marks. | ||
| 08:49 | Watch the video available at the following link | ||
| 08:51 | It summarises the Spoken Tutorial project | ||
| 08:54 | If you do not have good bandwidth, you can download and watch it
| ||
| 08:58 | The Spoken Tutorial Project Team | ||
| 09:00 | Conducts workshops using spoken tutorials | ||
| 09:03 | Gives certificates for those who pass an online test | ||
| 09:06 | For more details, please write to contact at spoken hyphen tutorial dot org
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| 09:14 | Spoken Tutorial Project is a part of the Talk to a Teacher project | ||
| 09:18 | - | 09:24 | More information on this Mission is available at |
| 09:27 | spoken hyphen tutorial dot org slash NMEICT hyphen Intro
| ||
| 09:35 | This is Ritwik Joshi from IIT Bombay.
Thank you for joining. |
