Difference between revisions of "C-and-C++/C2/Relational-Operators/English-timed"

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{| border=1
 
{| border=1
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+
|'''Time'''
−
!'''Time'''
+
|'''Narration'''
−
 
+
−
!'''Narration'''
+
  
 
|-
 
|-
−
|00.01
+
|00:01
 
| Welcome to the spoken tutorial on '''Relational Operators''' in '''C''' and '''C++'''.
 
| Welcome to the spoken tutorial on '''Relational Operators''' in '''C''' and '''C++'''.
  
 
|-
 
|-
−
|00.06
+
|00:06
 
|  In this tutorial, we will learn about:
 
|  In this tutorial, we will learn about:
  
 
|-
 
|-
−
|00.09 
+
|00:09 
−
|Relational operators like
+
|Relational operators like,
  
 
|-
 
|-
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|00.11
+
|00:11
−
|Less than: eg.  a < b  
+
|Less than: e.g.  a < b  
  
 
|-
 
|-
−
|00.14
+
|00:14
−
|Greater than: eg. a > b
+
|Greater than: e.g. a > b
  
 
|-
 
|-
−
|00.17
+
|00:17
−
|Less than or equal to: eg.  a <= b  
+
|Less than or equal to: e.g.  a <= b  
  
 
|-
 
|-
−
|00.22
+
|00:22
−
|Greater than or equal to: eg. a >= b
+
|Greater than or equal to: e.g. a >= b
  
 
|-
 
|-
−
|00.27
+
|00:27
−
|Equal to: eg. a == b
+
|Equal to: e.g. a == b
  
 
|-
 
|-
−
|00.30
+
|00:30
−
|Not equal to: eg. a != b
+
|Not equal to: e.g. a != b
  
 
|-
 
|-
−
| 00.37
+
| 00:37
−
|   To record this tutorial, I am using: '''Ubuntu 11.10''' as the operating system         
+
| To record this tutorial, I am using: '''Ubuntu 11.10''' as the operating system,        
  
 
|-
 
|-
−
|00.42
+
|00:42
 
|'''gcc''' and '''g++ Compiler '''version '''4.6.1 '''in '''Ubuntu.'''
 
|'''gcc''' and '''g++ Compiler '''version '''4.6.1 '''in '''Ubuntu.'''
−
 
  
 
|-
 
|-
−
|  00.50  
+
|  00:50  
 
|  Let us begin with an introduction.
 
|  Let us begin with an introduction.
  
 
|-
 
|-
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|00.53
+
|00:53
 
|Relational operators are used to compare integer and floating point numbers.
 
|Relational operators are used to compare integer and floating point numbers.
  
 
|-
 
|-
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|00.57
+
|00:57
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|Expressions using relational operators '''return''' 0 for false and 1 for true.  
+
|Expressions using relational operators '''return''' '''0''' for false and '''1''' for true.  
  
 
|-
 
|-
−
| 01.04
+
| 01:04
 
|  Now I will demonstrate the relational operators with the help of a C program.
 
|  Now I will demonstrate the relational operators with the help of a C program.
  
 
|-
 
|-
−
|  01.09
+
|  01:09
 
|  I have already made the program.
 
|  I have already made the program.
  
 
|-
 
|-
−
|01.11
+
|01:11
 
|So, I'll open the editor and explain the code.
 
|So, I'll open the editor and explain the code.
  
 
|-
 
|-
−
| 01.15
+
| 01:15
 
|  First, we declare two variables '''a '''and '''b'''.
 
|  First, we declare two variables '''a '''and '''b'''.
  
 
|-
 
|-
−
|  01.20
+
|  01:20
 
|  This '''printf''' statement prompts the user to enter the values of a and b.
 
|  This '''printf''' statement prompts the user to enter the values of a and b.
  
 
|-
 
|-
−
| 01.26  
+
| 01:26  
 
|  This '''scanf '''statement takes input for the variables '''a '''and '''b'''.
 
|  This '''scanf '''statement takes input for the variables '''a '''and '''b'''.
  
 
|-
 
|-
−
|  01.32
+
|  01:32
−
|  Now we have the '''greater than''' operator.
+
|  Now we have the '''greater than (>)''' operator.
  
 
|-
 
|-
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|01.35
+
|01:35
 
|This operator compares the two operands on either side of the operator.
 
|This operator compares the two operands on either side of the operator.
  
 
|-
 
|-
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|01.38
+
|01:38
−
|It '''returns''' ''False''' if '''a''' is greater than '''b'''.
+
|It returns '''True''' if '''a''' is greater than '''b'''.
  
 
|-
 
|-
−
|  01.43
+
|  01:43
 
|  This '''printf '''statement is executed if the above condition is true.
 
|  This '''printf '''statement is executed if the above condition is true.
  
 
|-
 
|-
−
|01.47
+
|01:47
 
|If the above condition is '''false '''then it is skipped.
 
|If the above condition is '''false '''then it is skipped.
  
 
|-
 
|-
−
|01.50
+
|01:50
 
|The control then jumps to the next statement.
 
|The control then jumps to the next statement.
  
 
|-
 
|-
−
| 01.53
+
| 01:53
−
|  We now have the '''less than''' operator.
+
|  We now have the '''less than (<)''' operator.
  
 
|-
 
|-
−
|01.56
+
|01:56
 
|This too compares the operands.
 
|This too compares the operands.
  
 
|-
 
|-
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|01.57
+
|01:57
−
|It '''returns''' '''true''' when '''a''' is less than '''b'''.
+
|It returns '''true''' when '''a''' is less than '''b'''.
  
 
|-
 
|-
−
| 02.02
+
| 02:02
 
|This '''printf''' statement is executed if the above condition is '''true.'''
 
|This '''printf''' statement is executed if the above condition is '''true.'''
  
 
|-
 
|-
−
|02.06
+
|02:06
 
|It is skipped otherwise.
 
|It is skipped otherwise.
  
 
|-
 
|-
−
|02.09
+
|02:09
 
|  Let's execute the code till here.
 
|  Let's execute the code till here.
  
 
|-
 
|-
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|02.13
+
|02:13
 
|First comment out the following.
 
|First comment out the following.
  
 
|-
 
|-
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|02.16
+
|02:16
−
|Type /*  
+
|Type '''/* (slash asterisk)
  
 
|-
 
|-
−
|02.21
+
|02:21
−
| */ ''' '''
+
| */ ''' (asterisk slash).
  
 
|-
 
|-
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| 02.24
+
| 02:24
 
|  Click on '''Save'''.
 
|  Click on '''Save'''.
  
 
|-
 
|-
−
|02.26
+
|02:26
−
|I have saved my file as relational.c
+
|I have saved my file as '''relational.c'''.
  
 
|-
 
|-
−
| 02.29
+
| 02:29
−
|  Open the terminal window by pressing '''Ctrl, Alt and T '''keys''' '''simultaneously.
+
|  Open the terminal window by pressing '''Ctrl, Alt''' and '''T '''keys simultaneously.
  
 
|-
 
|-
−
| 02.35
+
| 02:35
−
|  To compile, type the following on the terminal '''gcc space  relational dot c space -o space rel'''
+
|  To compile, type the following on the terminal '''gcc space  relational dot c space -o space rel'''.
  
 
|-
 
|-
−
| 02.49
+
| 02:49
 
|  Press '''Enter'''.
 
|  Press '''Enter'''.
  
 
|-
 
|-
−
| 02.51
+
| 02:51
−
|  To execute   type '''./rel''' Press '''Enter'''.
+
|  To execute,  type '''./rel''' (dot slash rel). Press '''Enter'''.
−
 
+
 
   
 
   
 
|-
 
|-
−
| 02.56
+
| 02:56
 
|  I enter '''a''' as 8 and '''b '''as 3.
 
|  I enter '''a''' as 8 and '''b '''as 3.
  
 
|-
 
|-
−
| 03.01
+
| 03:01
 
|  The output is displayed:
 
|  The output is displayed:
  
 
|-
 
|-
−
| 03.03
+
| 03:03
−
|  8 is greater than 3.
+
|  '''8 is greater than 3'''.
  
 
|-
 
|-
−
| 03.07
+
| 03:07
 
|  You can try executing this code with different values of '''a '''and '''b'''.
 
|  You can try executing this code with different values of '''a '''and '''b'''.
  
 
|-
 
|-
−
|03.11
+
|03:11
 
| Coming back to  the code.
 
| Coming back to  the code.
  
 
|-
 
|-
−
| 03.14
+
| 03:14
 
|  Delete the comment from here   
 
|  Delete the comment from here   
 
|-
 
|-
−
| 03.18
+
| 03:18
−
|  and  put it   here.
+
|  and  put it here.
  
 
|-
 
|-
−
| 03.24
+
| 03:24
−
|Now we have the '''less than or equal to '''operator.
+
|Now we have the '''less than or equal to (<=) '''operator.
  
 
|-
 
|-
−
| 03.28
+
| 03:28
 
|  This operator compares the two operands on either side of the operator.
 
|  This operator compares the two operands on either side of the operator.
  
 
|-
 
|-
−
| 03.33
+
| 03:33
−
|  It '''returns''' '''true''' if '''a''' is less than or equal to '''b'''.
+
|  It returns '''true''' if '''a''' is less than or equal to '''b'''.
  
 
|-
 
|-
−
|03.38
+
|03:38
 
| This '''printf '''statement is executed if the above condition is true.
 
| This '''printf '''statement is executed if the above condition is true.
  
 
|-
 
|-
−
| 03.42
+
| 03:42
 
|  If the above condition is '''false '''then it is skipped.
 
|  If the above condition is '''false '''then it is skipped.
  
 
|-
 
|-
−
| 03.45
+
| 03:45
 
|  The control then jumps to the next statement.
 
|  The control then jumps to the next statement.
  
 
|-
 
|-
−
| 03.49
+
| 03:49
−
| Next comes the '''greater than or equal to '''operator.
+
| Next comes the '''greater than or equal to (>=) '''operator.
  
 
|-
 
|-
−
| 03.52
+
| 03:52
−
|  It compares '''a '''and '''b '''and '''returns''' '''true''' if '''a''' is greater than or equal to '''b'''.
+
|  It compares '''a '''and '''b '''and returns '''true''' if '''a''' is greater than or equal to '''b'''.
  
 
|-
 
|-
−
| 04.00
+
| 04:00
 
| If the condition is true then this printf statement will be executed.
 
| If the condition is true then this printf statement will be executed.
  
 
|-
 
|-
−
| 04.05
+
| 04:05
 
| Now let's execute the code till here.
 
| Now let's execute the code till here.
  
 
|-
 
|-
−
| 04.07
+
| 04:07
 
|  Click on '''Save'''.
 
|  Click on '''Save'''.
  
 
|-
 
|-
−
| 04.09
+
| 04:09
 
|  Switch back to the terminal.
 
|  Switch back to the terminal.
  
 
|-
 
|-
−
| 04.12
+
| 04:12
 
|  Compile and execute as before.
 
|  Compile and execute as before.
−
 
 
   
 
   
 
|-
 
|-
−
| 04.17
+
| 04:17
 
|  I enter '''a''' as 8 and '''b '''as 3.
 
|  I enter '''a''' as 8 and '''b '''as 3.
  
 
|-
 
|-
−
| 04.22
+
| 04:22
 
|  The output is displayed:
 
|  The output is displayed:
  
 
|-
 
|-
−
| 04.25
+
| 04:25
−
|  8 is greater than or equal to 3
+
|  '''8 is greater than or equal to 3'''
  
 
|-
 
|-
−
| 04.30
+
| 04:30
 
|Now  Coming back to rest of the code.
 
|Now  Coming back to rest of the code.
  
 
|-
 
|-
−
| 04.33
+
| 04:33
 
|  Delete the multiline comments from here
 
|  Delete the multiline comments from here
  
 
|-
 
|-
−
| 04.39
+
| 04:39
 
|  and here.
 
|  and here.
  
 
|-
 
|-
−
| 04.43
+
| 04:43
−
|we now have the '''equal to '''operator.
+
|We now have the '''equal to '''operator.
  
 
|-
 
|-
−
| 04.47
+
| 04:47
−
|  It is denoted by double '''equal (==) '''signs.
+
|  It is denoted by '''double equal signs (==)'''.
  
 
|-
 
|-
−
| 04.50
+
| 04:50
−
|  This operator '''returns''' '''true''' when both operands are equal to one another.
+
|  This operator returns '''true''' when both operands are equal to one another.
  
 
|-
 
|-
−
| 04.57
+
| 04:57
 
|This '''printf''' statement executes when '''a''' is equal to '''b.'''
 
|This '''printf''' statement executes when '''a''' is equal to '''b.'''
  
 
|-
 
|-
−
| 05.00
+
| 05:00
 
|  If not, the control then jumps on to the next statement.
 
|  If not, the control then jumps on to the next statement.
  
 
|-
 
|-
−
|05.06
+
|05:06
 
|Similarly, we have the '''not equal to''' operator.
 
|Similarly, we have the '''not equal to''' operator.
  
 
|-
 
|-
−
| 05.08
+
| 05:08
−
|  This operator '''returns true''' when the operands are not equal to one another.
+
|  This operator returns '''true''' when the operands are not equal to one another.
  
 
|-
 
|-
−
|05.15
+
|05:15
−
| This '''printf''' statment will execute when '''a''' is not equal to '''b'''.
+
| This '''printf''' statement will execute when '''a''' is not equal to '''b'''.
  
 
|-
 
|-
−
|  05.20
+
|  05:20
−
|Coming to the end of the program.
+
|Coming to the end of the program. '''return 0;'''
−
 
+
−
'''Return 0;'''
+
  
 
|-
 
|-
−
| 05.24
+
| 05:24
 
| Click on '''Save'''.
 
| Click on '''Save'''.
  
 
|-
 
|-
−
|05.26
+
|05:26
 
| Switch back to the terminal.
 
| Switch back to the terminal.
  
 
|-
 
|-
−
| 05.28
+
| 05:28
 
|  Compile and execute as before.
 
|  Compile and execute as before.
−
 
  
 
|-
 
|-
−
| 05.32
+
| 05:32
 
|  Enter '''a''' as 8 and '''b '''as 3.
 
|  Enter '''a''' as 8 and '''b '''as 3.
  
 
|-
 
|-
−
| 05.38
+
| 05:38
 
|  The output is displayed on the screen:
 
|  The output is displayed on the screen:
  
 
|-
 
|-
−
| 05.40
+
| 05:40
−
|  8 is not equal to 3  
+
|  '''8 is not equal to 3'''
  
 
|-
 
|-
−
| 05.44
+
| 05:44
−
|  So, we see how the relational operaotors work.
+
|  So, we see how the relational operators work.
  
 
|-
 
|-
−
| 05.48
+
| 05:48
 
|  Try executing this code with different set of inputs.
 
|  Try executing this code with different set of inputs.
  
 
|-
 
|-
−
| 05.51
+
| 05:51
 
| Now, writing a similar program in '''C++''' is quite easy.
 
| Now, writing a similar program in '''C++''' is quite easy.
  
 
|-
 
|-
−
| 05.56
+
| 05:56
 
|  There are a few differences in the syntax.
 
|  There are a few differences in the syntax.
  
 
|-
 
|-
−
| 05.59
+
| 05:59
 
|  I have already made the code in '''C++'''.
 
|  I have already made the code in '''C++'''.
  
 
|-
 
|-
−
|06.04
+
|06:04
 
| Here  is the code for '''relational operators''' in '''C++'''.
 
| Here  is the code for '''relational operators''' in '''C++'''.
  
 
|-
 
|-
−
|06.08
+
|06:08
 
|Notice that the header is different.
 
|Notice that the header is different.
  
 
|-
 
|-
−
| 06.12
+
| 06:12
 
|  Also we have the '''using '''statement here.
 
|  Also we have the '''using '''statement here.
  
 
|-
 
|-
−
| 06.15
+
| 06:15
 
|  The output statement in C++ is '''cout'''.
 
|  The output statement in C++ is '''cout'''.
  
 
|-
 
|-
−
| 06.19
+
| 06:19
 
|  And the input statement in C++ is''' cin.'''
 
|  And the input statement in C++ is''' cin.'''
  
 
|-
 
|-
−
| 06.22
+
| 06:22
 
|  So, apart from these differences, the two codes are very similar.
 
|  So, apart from these differences, the two codes are very similar.
  
 
|-
 
|-
−
|06.26
+
|06:26
−
| Click on save.
+
| Click on Save.
  
 
|-
 
|-
−
| 06.28
+
| 06:28
−
|  Please make sure the file is saved with the extension '''.cpp'''
+
|  Please make sure the file is saved with the extension '''.cpp'''.
  
 
|-
 
|-
−
| 06.32
+
| 06:32
−
|  I have saved my file as '''relational.cpp'''
+
|  I have saved my file as '''relational.cpp'''.
  
 
|-
 
|-
−
| 06.37
+
| 06:37
 
| Let's compile the code.
 
| Let's compile the code.
  
 
|-
 
|-
−
| 06.39
+
| 06:39
 
|  Open the terminal and type '''g++ relational.cpp space minus o space rel1'''
 
|  Open the terminal and type '''g++ relational.cpp space minus o space rel1'''
  
 
|-
 
|-
−
| 06.50
+
| 06:50
−
|  To  execute Type '''./ rel1'', Press Enter.
+
|  To  execute, type '''./rel1''' (dot slash rel1), press Enter.
 
   
 
   
 
|-
 
|-
−
| 06.56
+
| 06:56
 
|  I enter '''a''' as 8 and '''b '''as 3.
 
|  I enter '''a''' as 8 and '''b '''as 3.
  
 
|-
 
|-
−
| 07.00
+
| 07:00
 
|  The output is displayed:
 
|  The output is displayed:
  
 
|-
 
|-
−
| 07.02
+
| 07:02
 
|  We see that the output is same as  the one in  '''C''' program.
 
|  We see that the output is same as  the one in  '''C''' program.
  
 
|-
 
|-
−
| 07.07
+
| 07:07
 
| Now let us see an error which we can come across.
 
| Now let us see an error which we can come across.
  
 
|-
 
|-
−
| 07.10
+
| 07:10
−
|  Come back to the program
+
|  Come back to the program.
  
 
|-
 
|-
−
| 07.13
+
| 07:13
−
| Suppose here we replace the double equal to sign with the single equal to.
+
| Suppose here we replace the 'double equal to' sign with the 'single equal to'.
  
 
|-
 
|-
−
| 07.19
+
| 07:19
 
|  Click on '''Save.'''
 
|  Click on '''Save.'''
  
 
|-
 
|-
−
| 07.21
+
| 07:21
 
|  Come back to the terminal.
 
|  Come back to the terminal.
  
 
|-
 
|-
−
| 07.23
+
| 07:23
 
|  Compile and execute as before.
 
|  Compile and execute as before.
  
 
|-
 
|-
−
|  07.33
+
|  07:33
 
| Here we see it is showing 3 is equal to 3.
 
| Here we see it is showing 3 is equal to 3.
  
 
|-
 
|-
−
| 07.37
+
| 07:37
−
|  Come back to our program
+
|  Come back to our program.
  
 
|-
 
|-
−
| 07.40
+
| 07:40
 
|  This is because here we have an assignment operator.
 
|  This is because here we have an assignment operator.
  
 
|-
 
|-
−
| 07.43
+
| 07:43
 
|  So value of b is assigned to a.
 
|  So value of b is assigned to a.
  
 
|-
 
|-
−
|  07.46
+
|  07:46
−
|Now   Let us fix this error.
+
|Now, let us fix this error.
  
 
|-
 
|-
−
| 07.49
+
| 07:49
 
|  Type an equal to sign.
 
|  Type an equal to sign.
  
 
|-
 
|-
−
| 07.51
+
| 07:51
−
|  Click on '''Save'''
+
|  Click on '''Save'''.
  
 
|-
 
|-
−
|  07.54
+
|  07:54
−
|  Switch back to  the terminal
+
|  Switch back to  the terminal.
  
 
|-
 
|-
−
| 07.56
+
| 07:56
−
|  compile and execute as before.
+
|  Compile and execute as before.
  
 
|-
 
|-
−
| 08.04
+
| 08:04
 
|  The output is now correct.
 
|  The output is now correct.
  
 
|-
 
|-
−
|08.06
+
|08:06
 
| Let's summarize the tutorial.
 
| Let's summarize the tutorial.
  
 
|-
 
|-
−
| 08.08
+
| 08:08
 
|  In this tutorial, we learnt
 
|  In this tutorial, we learnt
  
 
|-
 
|-
−
| 08.10
+
| 08:10
−
|  Relational operators like
+
|  relational operators like:
  
 
|-
 
|-
−
| 08.12
+
| 08:12
−
|  Less than:  eg. a <  b  
+
|  Less than:  e.g. a <  b  
  
 
|-
 
|-
−
| 08.14
+
| 08:14
−
|  Greater than: eg. a>b
+
|  Greater than: e.g. a>b
  
 
|-
 
|-
−
| 08.17
+
| 08:17
−
|  Less than or equal to:  eg. a<=b  
+
|  Less than or equal to:  e.g. a<=b  
  
 
|-
 
|-
−
| 08.22
+
| 08:22
−
|  Greater than or equal to: eg. a>=b
+
|  Greater than or equal to: e.g. a>=b
  
 
|-
 
|-
−
| 08.27
+
| 08:27
−
|  Equal to: eg. a==b
+
|  Equal to: e.g. a==b
  
 
|-
 
|-
−
| 08.29
+
| 08:29
−
|  Not equal to: eg. a!=b
+
|  Not equal to: e.g. a!=b
  
 
|-
 
|-
−
|  08.34  
+
|  08:34  
−
|  As an assignment
+
|  As an assignment:
  
 
|-
 
|-
−
| 08.35
+
| 08:35
 
|  Write a program that takes the marks of three students as input.
 
|  Write a program that takes the marks of three students as input.
  
 
|-
 
|-
−
| 08.39
+
| 08:39
 
|  Compare the marks to see which student has scored the highest.
 
|  Compare the marks to see which student has scored the highest.
  
 
|-
 
|-
−
| 08.43
+
| 08:43
 
|  Check also if two or more students have scored equal marks.
 
|  Check also if two or more students have scored equal marks.
  
 
|-
 
|-
−
|  08.48
+
|  08:48
−
|  Watch the video available at the following link  
+
|  Watch the video available at the following link.
 +
 
 
|-
 
|-
−
| 08.51
+
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|  It summarizes the Spoken Tutorial project  
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|  It summarizes the Spoken Tutorial project.
 +
 
 
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|-
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| 08.54
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| 08:54
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|  If you do not have good bandwidth, you can download and watch it  
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|  If you do not have good bandwidth, you can download and watch it.
  
 
|-
 
|-
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| 08.58  
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| 08:58  
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|  The Spoken Tutorial Project Team  
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|  The Spoken Tutorial Project Team:
  
 
|-
 
|-
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| 09.00
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| 09:00
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|  Conducts workshops using spoken tutorials  
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|  Conducts workshops using spoken tutorials.
  
 
|-
 
|-
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| 09.03
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| 09:03
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|  Gives certificates for those who pass an online test  
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|  Gives certificates for those who pass an online test.
  
 
|-
 
|-
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| 09.06
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| 09:06
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|  For more details, please write to contact at spoken hyphen tutorial dot org
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|  For more details, please write to contact at spoken hyphen tutorial dot org.
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+
  
 
|-
 
|-
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| 09.14
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| 09:14
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|  Spoken Tutorial Project is a part of the Talk to a Teacher project  
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|  Spoken Tutorial Project is a part of the Talk to a Teacher project.
  
 
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| 09.18
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| 09:18
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|  It is supported by the National Mission on Education through ICT, MHRD, Government of India  
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|  It is supported by the National Mission on Education through ICT, MHRD, Government of India.
  
 
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| 09.24
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| 09:24
 
|  More information on this Mission is available at  
 
|  More information on this Mission is available at  
  
 
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| 09.27
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| 09:27
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|  spoken hyphen tutorial dot org slash NMEICT hyphen Intro  
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|  spoken hyphen tutorial dot org slash NMEICT hyphen Intro.
  
 
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|  09.34
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|  09:34
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|  This is Ritwik Joshi from IIT Bombay.  
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|  This is Ritwik Joshi from IIT Bombay.Thank you for joining.  
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Thank you for joining.  
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Latest revision as of 14:20, 24 March 2017

Time Narration
00:01 Welcome to the spoken tutorial on Relational Operators in C and C++.
00:06 In this tutorial, we will learn about:
00:09 Relational operators like,
00:11 Less than: e.g. a < b
00:14 Greater than: e.g. a > b
00:17 Less than or equal to: e.g. a <= b
00:22 Greater than or equal to: e.g. a >= b
00:27 Equal to: e.g. a == b
00:30 Not equal to: e.g. a != b
00:37 To record this tutorial, I am using: Ubuntu 11.10 as the operating system,
00:42 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.
00:57 Expressions using relational operators return 0 for false and 1 for true.
01:04 Now I will demonstrate the relational operators with the help of a C program.
01:09 I have already made the program.
01:11 So, I'll open the editor and explain the code.
01:15 First, we declare two variables a and b.
01:20 This printf statement prompts the user to enter the values of a and b.
01:26 This scanf statement takes input for the variables a and b.
01:32 Now we have the greater than (>) operator.
01:35 This operator compares the two operands on either side of the operator.
01:38 It returns True if a is greater than b.
01:43 This printf statement is executed if the above condition is true.
01:47 If the above condition is false then it is skipped.
01:50 The control then jumps to the next statement.
01:53 We now have the less than (<) operator.
01:56 This too compares the operands.
01:57 It returns true when a is less than b.
02:02 This printf statement is executed if the above condition is true.
02:06 It is skipped otherwise.
02:09 Let's execute the code till here.
02:13 First comment out the following.
02:16 Type /* (slash asterisk)
02:21 */ (asterisk slash).
02:24 Click on Save.
02:26 I have saved my file as relational.c.
02:29 Open the terminal window by pressing Ctrl, Alt and T keys simultaneously.
02:35 To compile, type the following on the terminal gcc space relational dot c space -o space rel.
02:49 Press Enter.
02:51 To execute, type ./rel (dot slash rel). Press Enter.
02:56 I enter a as 8 and b as 3.
03:01 The output is displayed:
03:03 8 is greater than 3.
03:07 You can try executing this code with different values of a and b.
03:11 Coming back to the code.
03:14 Delete the comment from here
03:18 and put it here.
03:24 Now we have the less than or equal to (<=) operator.
03:28 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.
03:38 This printf statement is executed if the above condition is true.
03:42 If the above condition is false then it is skipped.
03:45 The control then jumps to the next statement.
03:49 Next comes the greater than or equal to (>=) operator.
03:52 It compares a and b and returns true if a is greater than or equal to b.
04:00 If the condition is true then this printf statement will be executed.
04:05 Now let's execute the code till here.
04:07 Click on Save.
04:09 Switch back to the terminal.
04:12 Compile and execute as before.
04:17 I enter a as 8 and b as 3.
04:22 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
04:39 and 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.
05:00 If not, the control then jumps on to the next statement.
05:06 Similarly, we have the not equal to operator.
05:08 This operator returns true when the operands are not equal to one another.
05:15 This printf statement will execute when a is not equal to b.
05:20 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.
05:32 Enter a as 8 and b as 3.
05:38 The output is displayed on the screen:
05:40 8 is not equal to 3
05:44 So, we see how the relational operators work.
05:48 Try executing this code with different set of inputs.
05:51 Now, writing a similar program in C++ is quite easy.
05:56 There are a few differences in the syntax.
05:59 I have already made the code in C++.
06:04 Here is the code for relational operators in C++.
06:08 Notice that the header is different.
06:12 Also we have the using statement here.
06:15 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.
06:26 Click on Save.
06:28 Please make sure the file is saved with the extension .cpp.
06:32 I have saved my file as relational.cpp.
06:37 Let's compile the code.
06:39 Open the terminal and type g++ relational.cpp space minus o space rel1
06:50 To execute, type ./rel1 (dot slash rel1), press Enter.
06:56 I enter a as 8 and b as 3.
07:00 The output is displayed:
07:02 We see that the output is same as the one in C program.
07:07 Now let us see an error which we can come across.
07:10 Come back to the program.
07:13 Suppose here we replace the 'double equal to' sign with the 'single equal to'.
07:19 Click on Save.
07:21 Come back to the terminal.
07:23 Compile and execute as before.
07:33 Here we see it is showing 3 is equal to 3.
07:37 Come back to our program.
07:40 This is because here we have an assignment operator.
07:43 So value of b is assigned to a.
07:46 Now, let us fix this error.
07:49 Type an equal to sign.
07:51 Click on Save.
07:54 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.
08:08 In this tutorial, we learnt
08:10 relational operators like:
08:12 Less than: e.g. a < b
08:14 Greater than: e.g. a>b
08:17 Less than or equal to: e.g. a<=b
08:22 Greater than or equal to: e.g. a>=b
08:27 Equal to: e.g. a==b
08:29 Not equal to: e.g. a!=b
08:34 As an assignment:
08:35 Write a program that takes the marks of three students as input.
08:39 Compare the marks to see which student has scored the highest.
08:43 Check also if two or more students have scored equal marks.
08:48 Watch the video available at the following link.
08:51 It summarizes 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.
09:14 Spoken Tutorial Project is a part of the Talk to a Teacher project.
09:18 It is supported by the National Mission on Education through ICT, MHRD, Government of India.
09:24 More information on this Mission is available at
09:27 spoken hyphen tutorial dot org slash NMEICT hyphen Intro.
09:34 This is Ritwik Joshi from IIT Bombay.Thank you for joining.

Contributors and Content Editors

Ashwini, PoojaMoolya, Pratik kamble, Priyacst, Sakinashaikh, Sandhya.np14

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