Difference between revisions of "C-and-C++/C2/First-C++-Program/English-timed"

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|-
 
|-
 
| 05:14
 
| 05:14
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|Now  after the brackets, type within  double quotes
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|Now  after the brackets, type within  double quotes.
  
 
|-
 
|-
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|-
 
|-
 
| 05:24
 
| 05:24
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|Now inside a quote type“Talk to a teacher backslash n” (/n)'''.   
+
|Now inside a quote type“Talk to a teacher backslash n” (\n)'''.   
  
 
|-
 
|-
 
| 05:31
 
| 05:31
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| Here '''\n''' signifies newline
+
| Here '''\n''' signifies newline.
  
 
|-
 
|-
 
| 05:35
 
| 05:35
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| As a result, after execution of the '''cout function''', the cursor moves to the new line.
+
| As a result, after execution of the '''cout''' function, the cursor moves to the new line.
  
 
|-
 
|-
 
| 05:41
 
| 05:41
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|  Every C++ statement must end with a '''semicolon'''  
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|  Every C++ statement must end with a '''semicolon'''.
  
  
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|-
 
|-
 
| 06:00
 
| 06:00
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| This statement returns the integer zero
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| This statement returns the integer zero.
  
  
 
|-
 
|-
 
| 06:03
 
| 06:03
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| An integer has to be returned for this '''function''' because the '''function''' type is '''int'''
+
| An integer has to be returned for this '''function''' because the '''function''' type is '''int'''.
  
  
 
|-
 
|-
 
| 06:10
 
| 06:10
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| The '''return''' statement marks the end of executable statements
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| The '''return''' statement marks the end of executable statements.
  
  
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|-
 
|-
 
| 06:20
 
| 06:20
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| Now click on '''“Save”''' button to save the file  
+
| Now click on '''“Save”''' button to save the file.
  
  
 
|-
 
|-
 
| 06:23
 
| 06:23
−
| It is a good habit to save files frequently
+
| It is a good habit to save files frequently.
  
  
 
|-
 
|-
 
| 06:26
 
| 06:26
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| This will protect you from sudden power failures
+
| This will protect you from sudden power failures.
  
  
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|-
 
|-
 
| 06:36
 
| 06:36
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| Come back to our  terminal
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| Come back to our  terminal.
  
  
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|-
 
|-
 
| 06:49
 
| 06:49
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|Here '''g++''' is the compiler used to compile '''C++ '''programs
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|Here '''g++''' is the compiler used to compile '''C++ '''programs.
  
  
 
|-
 
|-
 
| 06:55
 
| 06:55
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| '''talk.cpp''' is our filename  
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| '''talk.cpp''' is our filename.
  
 
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|-
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|-
 
|-
 
| 07:05
 
| 07:05
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| Now press '''Enter'''  
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| Now press '''Enter'''.
  
 
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|-
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|-
 
| 07:30
 
| 07:30
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|  Now let us see the common errors which we can come across
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|  Now let us see the common errors which we can come across.
  
  
 
|-
 
|-
 
| 07:35   
 
| 07:35   
−
| switch back to  our text editor.
+
| Switch back to  our text editor.
  
 
|-
 
|-
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|-
 
|-
 
| 07:42
 
| 07:42
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|Now save the file.
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|now save the file.
  
 
|-
 
|-
 
| 07:44
 
| 07:44
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| Let us execute. Come back to a terminal
+
| Let us execute. Come back to our terminal.
  
 
|-
 
|-
 
| 07:48
 
| 07:48
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| Now compile and run the program using the command we used before. We see an error
+
| Now compile and run the program using the command we used before. We see an error.
  
 
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|-
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| 08:09
 
| 08:09
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| As i said before the closing curly bracket marks the end of the function main
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| As I said before, the closing curly bracket marks the end of the function main
  
 
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| 08:19
 
| 08:19
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|  Let us execute it again
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|  Let us execute it again.
  
 
|-
 
|-
 
| 08:21
 
| 08:21
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| You can recall the previously entered commands by using up arrow key  
+
| You can recall the previously entered commands by using up arrow key.
  
 
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|-
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|08:32
 
|08:32
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|  I will show you another common error
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|  I will show you another common error.
  
 
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|-
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| 08:41
 
| 08:41
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| Let us save the file  
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| Let us save the file.
  
  
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|-
 
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| 08:48
 
| 08:48
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| We see that there is an  errors at line no 3 and  line no 6 in our '''talk.cpp''' file
+
| We see that there is an  error at line no.3 and  line no.6 in our '''talk.cpp''' file.
  
 
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|09:05
 
|09:05
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|  As '''cout''' is the standard '''C++ library function'''
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|  As '''cout''' is the standard '''C++ library function'''.
  
  
 
|-
 
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| 09:09
 
| 09:09
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| and the entire '''C++ library function''' is defined under '''std namespace '''
+
| and the entire '''C++ library function''' is defined under '''std namespace '''.
−
 
+
  
 
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|  09:18
 
|  09:18
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| Let us now  fix the error
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| Let us now  fix the error.
−
 
+
  
 
|-
 
|-
 
| 09:19
 
| 09:19
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| Come back to our Text editor.  Type '''std''' here
+
| Come back to our Text editor.  Type '''std''' here.
 +
 
 
|-
 
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| 09:23
 
| 09:23
−
| Let us Save it.
+
| Let us save it.
  
 
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|-
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| 09:29
 
| 09:29
 
|  Yes it is working.   
 
|  Yes it is working.   
−
 
  
 
|-
 
|-
 
| 09:32
 
| 09:32
 
|  As an assignment,
 
|  As an assignment,
−
 
  
 
|-
 
|-
 
| 09:33
 
| 09:33
−
| Write a program to print your name and city
+
| write a program to print your name and city.
−
 
+
  
 
|-
 
|-
 
| 09:37
 
| 09:37
−
| We used '''single line comment''' in this tutorial  
+
| We used '''single line comment''' in this tutorial.
  
 
|-
 
|-
 
|09:40
 
|09:40
−
| Now just try to give a '''multiline comment'''
+
| Now just try to give a '''multiline comment'''.
  
 
|-
 
|-
 
| 09:44
 
| 09:44
−
| Watch the video available at the link shown below   
+
| Watch the video available at the link shown below.  
  
 
|-
 
|-
 
| 09:46
 
| 09:46
−
| It summarises the Spoken Tutorial project  
+
| It summarizes the Spoken Tutorial project.
−
 
+
  
 
|-
 
|-
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|-
 
|09:53
 
|09:53
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|The Spoken Tutorial Project Team  
+
|The Spoken Tutorial Project Team:
−
 
+
  
 
|-
 
|-
 
| 09:55
 
| 09:55
−
| Conducts workshops using spoken tutorials  
+
| Conducts workshops using spoken tutorials.
−
 
+
  
 
|-
 
|-
 
|09:58
 
|09:58
−
| Gives certificates to those who pass an online test  
+
| Gives certificates to those who pass an online test.
−
 
+
  
 
|-
 
|-
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|-
 
|-
 
|10:10
 
|10:10
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|  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.
  
 
|-
 
|-
 
| 10:14
 
| 10:14
−
| 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.
−
 
+
  
 
|-
 
|-
 
| 10:20
 
| 10:20
−
| More information on this Mission is available at the link shown below
+
| More information on this Mission is available at the link shown below.
  
 
|-
 
|-
 
| 10:25
 
| 10:25
−
| This is Ashwini Patil from IIT Bombay signing off
+
| This is Ashwini Patil from IIT Bombay signing off.
−
 
+
  
 
|-
 
|-
 
| 10:28
 
| 10:28
−
| Thank you for watching
+
| Thank you for watching.
  
 
|}
 
|}

Revision as of 15:02, 30 January 2015

Time Narration
00:02 Welcome to the spoken tutorial on First C++ program.
00:07 In this tutorial I am going to explain,
00:10 *How to write a C++ program
00:13 *How to compile it
00:14 *How to execute it
00:17 We will also explain some common errors and their solution.
00:22 To record this tutorial, I am using Ubuntu operating system version 11.10 and
00:29 G++ Compiler version 4.5.2 on Ubuntu.
00:35 To practice this tutorial,
00:37 You should be familiar with Ubuntu Operating System and an Editor
00:44 Some editors are 'vim' and 'gedit'.
00:48 I am using 'gedit' in this tutorial.
00:50 For relevant tutorial please visit our website which is as shown.
00:56 Let me tell you how to write a C++ program through an example.
01:01 Open the terminal Window using Ctrl, Alt and T keys simultaneously on your keyboard.
01:09 To open the text editor, type on the terminal.
01:13 “gedit” space “talk” dot “.cpp” space ampersand “&” sign.
01:21 We use the “&” to free up the prompt.
01:25 Please note that all the C++ files will have the extension “.cpp”.
01:31 Now Press Enter,
01:33 the text editor has opened.
01:35 Let us start to write a program.
01:38 Type double slash “//” space “My first C++ program”.


01:44 Here, double slash is used to comment the line.
01:49 Comments are used to understand the flow of program.
01:52 It is useful for documentation.
01:55 It gives us information about the program.
01:59 The double slash is called as single line comment. Now press Enter.
02:05 Type hash “#include” space opening angle bracket closing angle bracket .


02:13 It is a good practice to complete the brackets first, and then start writing inside it.
02:20 Now Inside the bracket, type “iostream” .
02:23 Here iostream is a header file.
02:26 This file includes the declaration of standard input output functions in C++. Now press Enter.
02:35 Type “using” space “namespace” space “std” and a semicolon “;” .
02:45 The using statement informs the compiler that you want to use the std namespace.
02:52 The purpose of namespace is to avoid name collisions.
02:56 It is done by localizing the names of identifiers.
03:00 It creates a declarative region and defines a scope.
03:05 Anything defined within a namespace is in the SCOPE of that namespace.
03:11 Here std is the namespace in which entire standard C++ library is declared. Now press Enter.


03:20 Type “int” space “main” opening bracket, closing bracket .


03:26 main is a special function.
03:30 It denotes that the execution of the program begins from this line.
03:34 The opening and the closing bracket is called as Parenthesis.
03:39 Parenthesis followed by main tells the user that main is a function.
03:45 Here, the int main function takes no arguments and returns a value of type integer.
03:52 We will learn about data types in another tutorial.
03:56 Now let us switch to the slides to know more about main function.
04:02 Every programshould have one main function.
04:04 There should NOT be more than one “main” function.
04:09 Otherwise the compiler cannot locate the beginning of the program.
04:13 The empty pair of parentheses indicates that main has no arguments.
04:19 The concept of arguments will be discussed in the upcoming tutorials.
04:24 Now come back to our program. Press Enter.
04:29 Type opening curly bracket “{”.
04:32 The opening curly bracket marks the beginning of the function main().
04:37 Then Type closing curly bracket “}”.
04:40 The closing bracket indicates the end of the function main().
04:45 Now, inside the bracket press enter twice.
04:49 Move the cursor one line up.
04:51 Indentation makes the code easier to read.
04:54 It also helps to locate errors faster.
04:58 So let us give a space here.
05:01 And type “cout” space two opening angle bracket '.
05:07 Here cout is a standard C++ function to print the output on the terminal.
05:14 Now after the brackets, type within double quotes.
05:18 Anything within the double quotes in the cout functions will be printed.
05:24 Now inside a quote type“Talk to a teacher backslash n” (\n).
05:31 Here \n signifies newline.
05:35 As a result, after execution of the cout function, the cursor moves to the new line.
05:41 Every C++ statement must end with a semicolon.


05:45 Hence type it at the end of this line.
05:48 Semicolon acts as a statement terminator. Now press Enter.
05:53 Give a space here and Type “return” space “0” and a semicolon “;”.
06:00 This statement returns the integer zero.


06:03 An integer has to be returned for this function because the function type is int.


06:10 The return statement marks the end of executable statements.


06:14 We will learn more about the returned values in another tutorial.
06:20 Now click on “Save” button to save the file.


06:23 It is a good habit to save files frequently.


06:26 This will protect you from sudden power failures.


06:30 It will also be useful in case the applications were to crash.
06:34 Let us now compile the program.
06:36 Come back to our terminal.


06:39 Type “g++” space “talk.cpp” space hyphen “-o” space “output”.
06:49 Here g++ is the compiler used to compile C++ programs.


06:55 talk.cpp is our filename.
06:59 hyphen -o output says that the executable should go to the file output.
07:05 Now press Enter.
07:07 We see that the program is compiled.
07:10 By typing ls space hyphen lrt, we can see that output is the last file to be created.
07:19 Let us execute a program, type “./output” (dot slash output).


07:24 And Press Enter.
07:27 Here the output is displayed as “Talk to a teacher”.
07:30 Now let us see the common errors which we can come across.


07:35 Switch back to our text editor.
07:38 Suppose here we miss the }(closing curly bracket)
07:42 now save the file.
07:44 Let us execute. Come back to our terminal.
07:48 Now compile and run the program using the command we used before. We see an error.
07:55 We see that there is an error at line no.7 in our talk.cpp file that Expected curly bracket at the end of input.
08:07 Now Come back to our text editor .
08:09 As I said before, the closing curly bracket marks the end of the function main
08:14 Hence re-insert the bracket here. Now Save the file.
08:19 Let us execute it again.
08:21 You can recall the previously entered commands by using up arrow key.
08:26 That is what I did now.
08:30 Yes it is working.
08:32 I will show you another common error.
08:35 Let us switch back to our text editor.
08:37 Now, suppose here we missed std.
08:41 Let us save the file.


08:44 Come back to our terminal .
08:46 Let us compile .
08:48 We see that there is an error at line no.3 and line no.6 in our talk.cpp file.
08:56 That expected identifier before semicolon and cout was not declared in this scope.
09:05 As cout is the standard C++ library function.


09:09 and the entire C++ library function is defined under std namespace .
09:15 Hence it is giving an error.
09:18 Let us now fix the error.
09:19 Come back to our Text editor. Type std here.
09:23 Let us save it.
09:25 Let us compile it again.
09:29 Yes it is working.
09:32 As an assignment,
09:33 write a program to print your name and city.
09:37 We used single line comment in this tutorial.
09:40 Now just try to give a multiline comment.
09:44 Watch the video available at the link shown below.
09:46 It summarizes the Spoken Tutorial project.
09:48 If you do not have good bandwidth, you can download and watch it.
09:53 The Spoken Tutorial Project Team:
09:55 Conducts workshops using spoken tutorials.
09:58 Gives certificates to those who pass an online test.
10:01 For more details, please write to contact @spoken-tutorial.org
10:10 Spoken Tutorial Project is a part of the Talk to a Teacher project.
10:14 It is supported by the National Mission on Education through ICT, MHRD, Government of India.
10:20 More information on this Mission is available at the link shown below.
10:25 This is Ashwini Patil from IIT Bombay signing off.
10:28 Thank you for watching.

Contributors and Content Editors

Ashwini, Devraj, PoojaMoolya, Pratik kamble, Sandhya.np14, Sneha

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