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

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{| border=1
 
{| border=1
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|| Time
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|| '''Time'''
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|| Narration
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|| '''Narration'''
  
 
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|-
 
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| 00:08
 
| 00:08
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|In this tutorial we will learn about:Logical operators like  Logical AND eg. expression1 && expression2
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|In this tutorial we will learn about Logical operators like: '''Logical AND''' e.g. expression1 && expression2
  
 
|-
 
|-
 
| 00:16
 
| 00:16
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| Logical OR  
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| '''Logical OR''' eg. expression1 OR expression2
−
 
+
−
eg. expression1 or expression2
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|-
 
|-
 
| 00:21
 
| 00:21
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|Logical NOT
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|'''Logical NOT''' eg. not (Expression1)
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eg. not (Expression1)
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|-
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|-
 
|-
 
| 00:28  
 
| 00:28  
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|  To record this tutorial, I am using:'''Ubuntu 11.10''' as the operating system  
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|  To record this tutorial, I am using: '''Ubuntu 11.10''' as the operating system,
  
 
|-
 
|-
 
|00:33
 
|00:33
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|'''gcc''' and '''g++ Compiler '''version '''4.6.1 on''' '''Ubuntu.'''
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|'''gcc''' and '''g++ Compiler '''version '''4.6.1 '''on '''Ubuntu.'''
  
 
|-
 
|-
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|-
 
|-
 
| 00:43
 
| 00:43
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|In '''C '''and '''C++,''' '''true''' is any value other than 0.
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|In '''C '''and '''C++,''' '''true''' is any value other than '''0'''.
  
 
|-
 
|-
 
| 00:48
 
| 00:48
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|non zero means true
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|Non zero means '''true'''
  
 
|-
 
|-
 
| 00:50
 
| 00:50
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|And zero means false
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|and zero means '''false'''.
  
 
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|-
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|-
 
|-
 
| 01:08
 
| 01:08
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|  Inside the main block
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|  Inside the main block,
  
 
|-
 
|-
 
| 01:10
 
| 01:10
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|This statement declares the variables '''a''','''b''' and '''c''' as integers.
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|this statement declares the variables '''a''','''b''' and '''c''' as integers.
  
 
|-
 
|-
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|-
 
|-
 
| 01:28
 
| 01:28
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|| Here, We are comparing the values of '''a''' with '''b''' and '''c''' to find the greatest.
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| Here, We are comparing the values of '''a''' with '''b''' and '''c''' to find the greatest.
  
 
|-
 
|-
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|-
 
|-
 
| 01:38
 
| 01:38
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|Here, all of the conditions have to be true for '''logical AND '''to return a true value.
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|Here, all of the conditions have to be true for '''logical AND '''to return a '''true''' value.
  
 
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|-
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|-
 
| 02:02
 
| 02:02
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|This statement is   evaluated if the previous condition is true.  
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|This statement is evaluated if the previous condition is true.  
  
 
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|-
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|-
 
|-
 
|02:10
 
|02:10
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| If the condition is true, then '''b is greatest''' is displayed on the screen.
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| If the condition is true, then '''b is greatest''' is displayed on the screen.
  
 
|-
 
|-
−
| 02:16
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| 02:16
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| Otherwise '''c is greatest '''is displayed on the screen.  
+
| Otherwise '''c is greatest '''is displayed on the screen.  
  
 
|-
 
|-
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|-
 
|-
 
| 02:57
 
| 02:57
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|'''Save''' it with extension '''.c'''
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|'''Save''' it with extension '''.c''' (dot c).
  
 
|-
 
|-
 
| 03:00
 
| 03:00
−
|I have saved my file as '''logical.c'''
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|I have saved my file as '''logical.c'''.
  
 
|-
 
|-
 
| 03:03
 
| 03:03
−
|  Open the terminal by pressing '''Ctrl, Alt and T '''keys simulataneously.
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|  Open the terminal by pressing '''Ctrl, Alt''' and '''T '''keys simultaneously.
  
 
|-
 
|-
 
| 03:08
 
| 03:08
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|  To compile the code type '''gcc space logical dot c space minus o space  log''' Press enter
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|  To compile the code type '''gcc space logical dot c space minus o space  log'''. Press Enter.
  
 
|-
 
|-
 
| 03:23
 
| 03:23
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|To  execute  type '''./log'''
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|To  execute, type '''./log''' (dot slash log)
  
 
|-
 
|-
 
| 03:27
 
| 03:27
 
|Press '''Enter.'''
 
|Press '''Enter.'''
−
 
  
 
|-
 
|-
 
| 03:29
 
| 03:29
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|I will enter the values as,
+
|I will enter the values as: 0, 34, 567  
−
 
+
−
0  
+
−
 
+
−
34  
+
−
 
+
−
567  
+
  
 
|-
 
|-
 
| 03:39
 
| 03:39
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|The output is displayed as,
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|The output is displayed as:
  
 
|-
 
|-
 
| 03:42
 
| 03:42
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|c is greatest.  
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|'''c is greatest'''.  
  
 
|-
 
|-
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|-
 
|-
 
|03:55
 
|03:55
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| Now Let's write the same program in C++
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| Now Let's write the same program in C++.
  
 
|-
 
|-
−
| 03:59
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| 03:59
 
| I have already made the program and will take you through it.
 
| I have already made the program and will take you through it.
  
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|-
 
|-
 
| 04:06
 
| 04:06
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| | Now to make the same program in C++, we make a few changes.
+
| Now to make the same program in C++, we make a few changes.
  
 
|-
 
|-
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|-
 
|-
 
| 04:14
 
| 04:14
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|Using statement has been used.
+
|'''using''' statement has been used.
  
 
|-
 
|-
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| 04:21
 
| 04:21
 
|The operators behave in the same way as they did in C.
 
|The operators behave in the same way as they did in C.
−
 
  
 
|-
 
|-
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|-
 
|-
 
| 04:27
 
| 04:27
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| Make sure the file is saved with extension '''.cpp'''
+
| Make sure the file is saved with extension '''.cpp''' (dot cpp).
  
 
|-  
 
|-  
 
|  04:31
 
|  04:31
−
| Open the terminal by pressing '''Ctrl, Alt and T '''keys simulataneously.
+
| Open the terminal by pressing '''Ctrl, Alt''' and '''T '''keys simultaneously.
  
 
|-
 
|-
 
|04:36
 
|04:36
−
|To compile the program type '''g++ logical.cpp space minus o space log1'''. Press Enter
+
|To compile the program type '''g++ logical.cpp space minus o space log1'''. Press Enter.
  
 
|-
 
|-
 
| 04:49
 
| 04:49
−
|to execute   type '''./log1'''
+
|To execute,  type '''./log1''' (dot slash log1).
  
 
|-
 
|-
 
| 04:53
 
| 04:53
 
|press '''Enter.'''
 
|press '''Enter.'''
−
 
  
 
|-
 
|-
 
| 04:56
 
| 04:56
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|I will enter the values as
+
|I will enter the values as: 0, 34, 567  
−
 
+
−
0  
+
−
 
+
−
34  
+
−
 
+
−
567  
+
  
 
|-
 
|-
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|-
 
|-
 
|  05:26
 
|  05:26
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| Let see what will happen, Save the program.
+
| Let's see what will happen, save the program.
  
 
|-
 
|-
 
| 05:30
 
| 05:30
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|Come back to the terminal
+
|Come back to the terminal.
  
 
|-
 
|-
 
| 05:32
 
| 05:32
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|Compile and execute as before
+
|Compile and execute as before.
  
 
|-
 
|-
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|-
 
|-
 
| 05:41
 
| 05:41
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|Expected identifier before '(' token.
+
|'''Expected identifier before '(' token'''.
  
 
|-
 
|-
 
|  05:45
 
|  05:45
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|  This is because we have two different expressions here
+
|  This is because we have two different expressions here.
  
 
|-
 
|-
 
| 05:48
 
| 05:48
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|We have to evaluate them as one expression using AND operator.
+
|We have to evaluate them as one expression, using AND operator.
  
 
|-
 
|-
 
| 05:53
 
| 05:53
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|  Now let us go back to our program and fix the error
+
|  Now let us go back to our program and fix the error.
  
 
|-
 
|-
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| 06:04
 
| 06:04
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|Click on '''Save'''
+
|Click on '''Save'''.
  
 
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|  06:09
 
|  06:09
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| Compile and execute as before
+
| Compile and execute as before.
  
 
|-
 
|-
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|-
 
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| 06:24
 
| 06:24
−
| In this tutorial we learnt about  Logical AND eg. '''((a > b) && (a > c)) '''
+
| In this tutorial we learnt about  * Logical AND, eg. ((a > b) && (a > c))  
−
 
+
 
   
 
   
 
|-
 
|-
 
| 06:32
 
| 06:32
−
|Logical OR
+
| Logical OR
−
 
+
−
eg. '''(a == 0 || b == 0 || c == 0) '''
+
  
 +
eg. (a == 0 || b == 0 || c == 0)
  
 
|-
 
|-
 
| 06:39
 
| 06:39
−
|Assignment
+
|Assignment-
  
 
|-
 
|-
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|-
 
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| 06:44
 
| 06:44
−
|Check whether the two numbers are equal or not using '''NOT''' operator. Hint: '''(a != b)'''
+
|Check whether the two numbers are equal or not using '''NOT''' operator. Hint: (a != b)
  
 
|-
 
|-
 
| 06:54
 
| 06:54
−
|  Watch the video available at the following link  
+
|  Watch the video available at the following link.
  
 
|-
 
|-
 
| 06:57
 
| 06:57
−
|It summarises the Spoken Tutorial project  
+
|It summaries the Spoken Tutorial project.
  
 
|-
 
|-
 
| 06:59
 
| 06:59
−
|If you do not have good bandwidth, you can download and watch it  
+
|If you do not have good bandwidth, you can download and watch it.
−
 
+
−
 
+
  
 
|-
 
|-
 
|  07:03
 
|  07:03
−
| The Spoken Tutorial Project Team * Conducts workshops using spoken tutorials  
+
| The Spoken Tutorial Project Team : Conducts workshops using spoken tutorials.
  
 
|-
 
|-
 
| 07:07
 
| 07:07
−
| Gives certificates for those who pass an online test  
+
| Gives certificates to those who pass an online test.
  
 
|-
 
|-
 
| 07:11
 
| 07:11
−
| For more details, please write to contact at spoken hyphen tutorial dot org  
+
| For more details, please write to contact at spoken hyphen tutorial dot org.
  
 
|-
 
|-
 
| 07:18
 
| 07:18
−
|  Spoken Tutorial Project is a part of the Talk to a Teacher project  
+
|  Spoken Tutorial Project is a part of the Talk to a Teacher project.
 
|-
 
|-
 
| 07:21
 
| 07:21
−
|It is supported by the National Mission on Education through ICT, MHRD, Government of India  
+
|It is supported by the National Mission on Education through ICT, MHRD, Government of India.
  
 
|-
 
|-
 
| 07:27
 
| 07:27
−
| More information on this Mission is available at  
+
| More information on this mission is available at  
  
 
|-
 
|-
 
| 07:30
 
| 07:30
−
| spoken hyphen tutorial dot org slash NMEICT hyphen Intro  
+
| spoken hyphen tutorial dot org slash NMEICT hyphen Intro.
−
 
+
−
 
+
  
 
|-
 
|-
 
|  07:37
 
|  07:37
−
|  This is Ritwik Joshi from IIT Bombay.  
+
|  This is Ritwik Joshi from IIT Bombay. Thank you for joining.  
−
 
+
−
Thank you for joining.  
+
  
 
|}
 
|}

Latest revision as of 14:21, 24 March 2017

Time Narration
00:02 Welcome to the spoken tutorial on Logical operators in C and C++.
00:08 In this tutorial we will learn about Logical operators like: Logical AND e.g. expression1 && expression2
00:16 Logical OR eg. expression1 OR expression2
00:21 Logical NOT eg. not (Expression1)
00:25 We will do this with the help of examples.
00:28 To record this tutorial, I am using: Ubuntu 11.10 as the operating system,
00:33 gcc and g++ Compiler version 4.6.1 on Ubuntu.
00:39 Let us start with the introduction to the logical operators.
00:43 In C and C++, true is any value other than 0.
00:48 Non zero means true
00:50 and zero means false.
00:53 Expressions using logical operators return 1 for true and 0 for false.
00:58 Now I'll explain the logical operators with the help of an example.
01:03 Here is the program for logical operators in C.
01:08 Inside the main block,
01:10 this statement declares the variables a,b and c as integers.
01:16 The printf statement prompts the user to enter the values of a,b and c.
01:21 The scanf statement takes input from the user for variables a, b and c.
01:28 Here, We are comparing the values of a with b and c to find the greatest.
01:33 To compare simultaneously, we use the logical AND operator.
01:38 Here, all of the conditions have to be true for logical AND to return a true value.
01:43 The expression is not evaluated further on encountering a false condition.
01:49 So, the expression (a>c) is evaluated only if (a>b) is true.
01:56 If a is less than b, then the expression won't be evaluated further.
02:02 This statement is evaluated if the previous condition is true.
02:07 Next (b>c) is evaluated.
02:10 If the condition is true, then b is greatest is displayed on the screen.
02:16 Otherwise c is greatest is displayed on the screen.
02:21 We now come to the logical OR operator.
02:24 Here, any one of the conditions has to be true for logical OR to return a true value.
02:30 The expression is not evaluated further on encountering a true condition.
02:35 So, if a == zero, then the remaining two expressions won't be evaluated.
02:43 This printf statement is executed if either of a, b or c is 0.
02:49 Coming to the end of the program. return 0 and ending curly bracket.
02:54 Now save the program.
02:57 Save it with extension .c (dot c).
03:00 I have saved my file as logical.c.
03:03 Open the terminal by pressing Ctrl, Alt and T keys simultaneously.
03:08 To compile the code type gcc space logical dot c space minus o space log. Press Enter.
03:23 To execute, type ./log (dot slash log)
03:27 Press Enter.
03:29 I will enter the values as: 0, 34, 567
03:39 The output is displayed as:
03:42 c is greatest.
03:45 The product of a, b and c is zero.
03:50 You should try executing this program with different sets of inputs.
03:55 Now Let's write the same program in C++.
03:59 I have already made the program and will take you through it.
04:03 Here is the code in C++.
04:06 Now to make the same program in C++, we make a few changes.
04:11 There's a change in the header file.
04:14 using statement has been used.
04:18 Also there is a difference in output and input statements.
04:21 The operators behave in the same way as they did in C.
04:25 Click on Save.
04:27 Make sure the file is saved with extension .cpp (dot cpp).
04:31 Open the terminal by pressing Ctrl, Alt and T keys simultaneously.
04:36 To compile the program type g++ logical.cpp space minus o space log1. Press Enter.
04:49 To execute, type ./log1 (dot slash log1).
04:53 press Enter.
04:56 I will enter the values as: 0, 34, 567
05:02 So we see the output is similar to the C program.
05:05 You should try executing the program with different sets of inputs too.
05:10 Now let us see an error which we can come across.
05:12 Let's switch to the editor.
05:16 Suppose here we forgot the brackets.
05:20 Delete this and this.
05:26 Let's see what will happen, save the program.
05:30 Come back to the terminal.
05:32 Compile and execute as before.
05:38 We see the error:
05:41 Expected identifier before '(' token.
05:45 This is because we have two different expressions here.
05:48 We have to evaluate them as one expression, using AND operator.
05:53 Now let us go back to our program and fix the error.
05:57 Let us insert the brackets here and here.
06:04 Click on Save.
06:06 Come back to the terminal.
06:09 Compile and execute as before.
06:14 So it is working now.
06:22 Let us now summarize the tutorial.
06:24 In this tutorial we learnt about * Logical AND, eg. ((a > b) && (a > c))
06:32 Logical OR

eg. (a == 0 || b == 0 || c == 0)

06:39 Assignment-
06:41 Write a program that takes two numbers as input from the user.
06:44 Check whether the two numbers are equal or not using NOT operator. Hint: (a != b)
06:54 Watch the video available at the following link.
06:57 It summaries the Spoken Tutorial project.
06:59 If you do not have good bandwidth, you can download and watch it.
07:03 The Spoken Tutorial Project Team : Conducts workshops using spoken tutorials.
07:07 Gives certificates to those who pass an online test.
07:11 For more details, please write to contact at spoken hyphen tutorial dot org.
07:18 Spoken Tutorial Project is a part of the Talk to a Teacher project.
07:21 It is supported by the National Mission on Education through ICT, MHRD, Government of India.
07:27 More information on this mission is available at
07:30 spoken hyphen tutorial dot org slash NMEICT hyphen Intro.
07:37 This is Ritwik Joshi from IIT Bombay. Thank you for joining.

Contributors and Content Editors

Ashwini, PoojaMoolya, Pratik kamble, Sandhya.np14

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