Difference between revisions of "C-and-C++/C3/String-Library-Functions/English-timed"

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{| border=1
+
{| border = 1
−
|| ''Time'''
+
 
−
|| '''Narration'''
+
|'''Time'''
 +
|'''Narration'''
  
 
|-
 
|-
−
| 00:02
+
| 00:01
−
| Welcome to the spoken-tutorial on String Library Functions in C
+
|Welcome to the spoken-tutorial on '''String Library Functions in C'''.
  
 
|-
 
|-
 
| 00:07
 
| 00:07
−
| In this tutorial, we will learn,
+
|In this tutorial we will learn  
  
 
|-
 
|-
−
| 00:10
+
| 00:09
−
| String Library Functions  
+
|String Library Functions.
  
 
|-
 
|-
−
| 00:12
+
| 00:11
−
| We will do this with the help of some examples  
+
|We will do this with the help of some examples.
  
 
|-
 
|-
 
| 00:15
 
| 00:15
−
| To record this tutorial, I am using
+
|To record this tutorial, I am using  
  
 
|-
 
|-
 
| 00:18
 
| 00:18
−
| Ubuntu Operating System version 11.10,  
+
| '''Ubuntu Operating System''' version 11.10,  
  
 
|-
 
|-
−
| 00:23
+
| 00:22
−
| gcc Compiler Version 4.6.1
+
|'''gcc Compiler''' Version 4.6.1.
  
 
|-
 
|-
 
| 00:27
 
| 00:27
−
| Let us start with an introduction to string library functions.
+
|Let us start with an introduction to string library functions.  
  
 
|-
 
|-
 
| 00:31
 
| 00:31
−
| These are the group of functions implementing operations on strings.
+
|These are the group of functions implementing operations on strings.  
  
 
|-
 
|-
−
| 00:37
+
|00:36
−
| Various operations such as copying, concatenation, searching etc are supported.
+
|Various operations such as copying, concatenation, searching etc are supported.
  
 
|-
 
|-
−
| 00:45
+
|00:44
−
|Let us see some of the string library functions
+
|Let us see some of the string library functions.
  
 
|-
 
|-
−
| 00:49
+
|00:48
−
| Here we have the '''strncpy''' function  
+
|Here we have the '''strncpy''' function.
  
 
|-
 
|-
−
| 00:52
+
|00:52
−
| The syntax for this is strncpy(char str1, char str2, int n )
+
|The syntax for this is '''strncpy(char str1, char str2, and int n ); '''
  
 
|-
 
|-
−
| 01:02
+
|01:02
−
| It copies first n characters of '''string str2''' into '''string str1'''.
+
|It copies first n characters of string '''str2 ''' into string '''str1'''.
  
 
|-
 
|-
−
| 01:10
+
| 01:09
−
| eg. char strncpy(char hello, char world, 2);
+
|example, '''char strncpy( char hello, char world, 2);'''
  
 
|-
 
|-
−
| 01:17
+
| 01:16
−
| The output will be ;'''Wollo'''
+
|The output will be '''Wollo '''.
  
 
|-
 
|-
−
| 01:21
+
|01:21
−
| Here we have''' Wo '''fromt the string 2 and rest of the characters from string 1
+
|Here we have '''Wo''' from the string 2 and rest of the characters from string 1.
  
 
|-
 
|-
−
| 01:29
+
| 01:29
−
| Now we will see strncmp function, the syntax for this is strncmp (char str1, char str2 and int n)
+
|Now we will see '''strncmp''' function, the syntax for this is '''strncmp(char str1, char str2, and int n); '''
  
 
|-
 
|-
−
| 01:43
+
| 01:42
−
| It will compare first n characters of string 2 with string 1
+
|It will compare first n characters of string 2 with string 1.
  
 
|-
 
|-
−
| 01:49
+
| 01:48
−
| eg. int strncmp(char ice, char icecream, int 2);
+
|example''' int strncmp(char ice, char icecream, and  2);'''
  
 
|-
 
|-
−
| 01:56
+
|01:55
−
| The output will be 0
+
|The output will be 0.
  
 
|-
 
|-
−
| 01:58
+
| 01:58
−
| Now we will see how to use the string library functions.
+
|Now we will see how to use the string library functions.  
  
 
|-
 
|-
−
| 02:03
+
| 02:02
−
| I am going to show you some of the commonly used string functions.
+
|I am going to show you some of the commonly used string functions.  
  
 
|-
 
|-
−
| 02:08
+
|02:07
−
| I have already typed the program on the editor,
+
|I have already typed the program on the editor,  
  
 
|-
 
|-
−
| 02:11
+
|02:10
−
| i will open it  
+
| I will open it.
  
 
|-
 
|-
−
| 02:12
+
|02:12
−
| Here we have the string length function  
+
|Here, we have the string length function.
  
 
|-
 
|-
−
| 02:15
+
|02:15
−
|   Note that our filename is strlen.c.
+
|Note that our file name is '''strlen.c. '''
  
 
|-
 
|-
−
| 02:20
+
|02:20
−
| In this we will find the length of the string  
+
|In this, we will find the length of the string.
  
 
|-
 
|-
−
| 02:24
+
|02:23
−
| These are the header files as '''stdio.h and string.h '''  
+
|These are the header files as '''stdio.h''' and '''string.h. '''
 +
 
 
|-
 
|-
−
| 02:29
+
|02:29
−
| This is our main function
+
|This is our main() function.
  
 
|-
 
|-
−
| 02:32
+
| 02:31
−
| Here we have a character variable ''''arr'''',
+
|Here we have a character variable ''' 'arr'. '''
  
 
|-
 
|-
−
| 02:36
+
| 02:35
−
| It stores a value ''''Ashwini''''
+
|It stores a value ''' 'Ashwini' '''.
  
 
|-
 
|-
−
| 02:39
+
| 02:38
−
| Then we have an integer variable '''len1 '''
+
|Then we have an integer variable '''len1 '''.
−
 
+
−
 
+
−
 
+
  
 
|-
 
|-
−
| 02:43
+
| 02:42
−
| here we will find the lenght of the string using''' strlen''' funtion
+
|Here we will find the length of the string using '''strlen''' function.
  
 
|-
 
|-
−
| 02:49
+
| 02:48
−
|the result will be stored in '''len1'''
+
|The result will be stored in 'len1'.
  
 
|-
 
|-
−
| 02:53
+
| 02:52
−
| Then we print the string and the length of the string.
+
|Then we print the string and the length of the string.  
  
 
|-
 
|-
−
| 02:57
+
|02:56
−
|And this is our return statement  
+
|And this is our '''return''' statement.
−
 
+
  
 
|-
 
|-
−
| 02:59
+
|02:59
−
|Now let us execute the program
+
|Now let us execute the program.
  
 
|-
 
|-
−
| 03:02
+
|03:01
−
|Open the terminal window by pressing
+
|Open the terminal window by pressing  
  
 
|-
 
|-
 
| 03:04
 
| 03:04
−
|'''Ctrl, Alt''' and '''T''' keys simultaneously on your keyboard  
+
|'''Ctrl, Alt''' and '''T''' keys simultaneously on your keyboard.
  
 
|-
 
|-
−
| 03:10
+
| 03:09
−
| To compile
+
| To compile, type:''' "gcc" ''' space ''' "strlen.c" ''' space ''' “-o”''' space''' “str1”'''.  Press Enter.  
−
 
+
−
|-
+
−
| 03:11
+
−
|Type:  "gcc" space "strlen.c" space “-o” space “str1”.
+
  
 
|-
 
|-
 
| 03:19
 
| 03:19
−
|Press Enter
+
|Type (dot slash)''' ./str1.''' Press Enter.
−
 
+
−
|-
+
−
|  03:20
+
−
|  type: '''./str1'''  
+
−
 
+
−
|-
+
−
| 03:23
+
−
|Press Enter  
+
  
 
|-
 
|-
 
| 03:24
 
| 03:24
−
| The output is displayed as  
+
|The output is displayed as  
  
 
|-
 
|-
 
| 03:26
 
| 03:26
−
|'''string = Ashwini, Length = 7'''
+
|'''string = Ashwini, Length = 7 '''
  
 
|-
 
|-
−
| 03:30
+
|03:30
−
|You can count here. 1,2,3,4,5,6, and 7
+
|You can count here. 1,2,3,4,5,6, and 7.
  
 
|-
 
|-
−
| 03:38
+
| 03:37
−
|   Let us see another string function  
+
| Let us see another string function.
  
 
|-
 
|-
−
| 03:41
+
| 03:40
−
|Here we have the string copy fuction
+
|Here we have the '''string copy''' function. 
  
 
|-
 
|-
 
| 03:43
 
| 03:43
−
|   Note that our filename is '''strcpy.c'''.
+
|Note that our file name is '''strcpy.c '''.
  
 
|-
 
|-
−
| 03:49
+
| 03:48
−
| In this we will copy the source string into the target string
+
|In this, we will copy the source string into the target string.
  
 
|-
 
|-
−
| 03:54
+
| 03:53
−
|Here we have Ice in the source string, it will be copied to the target string .
+
|Here we have 'Ice' in the source string, it will be copied to the target string.  
  
 
|-
 
|-
−
| 04:00
+
| 03:59
−
| This is our '''strcpy ''' function
+
|This is our '''strcpy''' function
  
 
|-
 
|-
−
| 04:03
+
| 04:02
−
|   Here we print the source string and the target string  
+
|Here we will print the source string and the target string.
  
 
|-
 
|-
−
| 04:07
+
| 04:07
−
| Let us execute and see  
+
|Let us execute and see. 
  
 
|-
 
|-
 
| 04:09
 
| 04:09
−
|Come back to our terminal  
+
|Come back to our terminal.
  
 
|-
 
|-
 
| 04:11
 
| 04:11
−
|  | To compile type
+
| To compile, type '''gcc '''space '''strcpy.c''' space hyphen ''' o''' space '''str2'''. Press  '''Enter'''
  
 
|-
 
|-
−
| 04:12
+
| 04:20
−
|'''gcc''' space '''strcpy.c '''space '''-o '''space '''str2'''
+
|Type (dot slash)'''./str2 '''. Press '''Enter '''.
  
 
|-
 
|-
−
| 04:19
+
| 04:24
−
|Press '''Enter'''
+
|The output is displayed as:
  
 
|-
 
|-
−
| 04:21
+
| 04:26
−
|Type  '''./str2 '''
+
|'''source string = Ice '''
  
 
|-
 
|-
−
| 04:23
+
| 04:29
−
|Press''' Enter'''
+
|'''target string = Ice '''
−
 
+
−
+
−
 
+
−
+
  
 
|-
 
|-
−
| 04:25
+
| 04:32
−
| The output is displayed as
+
| Now let us see another string function.
  
 
|-
 
|-
−
| 04:27
+
| 04:34
−
|source string = Ice
+
|Now we will see the string compare function.
  
 
|-
 
|-
−
| 04:30
+
| 04:37
−
|target string = Ice
+
|Note that our file name is '''strcmp.c'''.
  
 
|-
 
|-
−
| 04:32
+
| 04:42
−
| Now let us see another string function
+
|In this, we will compare two strings.
  
 
|-
 
|-
−
| 04:35
+
| 04:46
−
|   Now we will see the string compare function
+
|Here we have character variables as '''str1''' and '''str2 '''.
  
 
|-
 
|-
−
| 04:38
+
| 04:52
−
|Note that our filename is '''strcmp.c'''
+
|'''str1''' stores the value as ''' 'Ice'''' and '''str2''' stores the value as ''' 'Cream'.'''
  
 
|-
 
|-
−
| 04:43
+
| 04:58
−
|In this we will comapre two strings
+
|Here we have integer variables as i and j.
  
 
|-
 
|-
−
| 04:47
+
| 05:03
−
|Here we have character variables as '''str1''' and '''str2 '''
+
|In this we will compare the string using the '''strcmp''' function.  
−
'
+
−
|-
+
−
|  04:53
+
−
|  '''str 1''' stores the value as ''''Ice'''' and    ''' str2 '''stores the value as ''''Cream'.'''
+
  
 
|-
 
|-
−
| 04:59
+
| 05:08
−
|Here we have interger variables as''' i '''and''' j'''
+
|Here we compare str1 i.e 'Ice' with 'Hello'.
−
 
+
−
|-
+
−
| 05:04
+
−
|In this we will compare the string using the''' strcmp''' function
+
−
 
+
−
|-
+
−
|05: 09
+
−
|Here we compare str1 ie: 'Ice' with 'Hello'
+
  
 
|-
 
|-
 
| 05:14
 
| 05:14
−
|The result is stored in '''i'''
+
|The result is stored in i.
  
 
|-
 
|-
−
| 05:17
+
| 05:16
−
|In this we will compare string 2 ie: 'Cream' with 'Cream'
+
|In this we will compare string2 i.e 'Cream' with 'Cream'  
  
 
|-
 
|-
 
| 05:23
 
| 05:23
−
|The result is stored in ''' j'''
+
|The result is stored in j.
  
 
|-
 
|-
 
| 05:25
 
| 05:25
−
|Then we print both the results  
+
|Then we print both the results.
  
 
|-
 
|-
 
| 05:28
 
| 05:28
−
|and this is our return statement  
+
|And this is our '''return''' statement.
  
 
|-
 
|-
−
| 05:31
+
| 05:31
−
| Let us execute the program.
+
|Let us execute the program.  
  
 
|-
 
|-
 
| 05:33
 
| 05:33
−
|Come back to our terminal.
+
|Come back to our terminal.
  
 
|-
 
|-
 
| 05:35
 
| 05:35
−
| To compile type
+
|To compile type '''gcc''' space '''strcmp.c''' space hyphen '''o''' space '''str3'''
−
 
+
−
|-
+
−
| 05:37
+
−
|'''gcc''' space '''strcmp.c '''space '''-o''' space '''str3 '''
+
  
 
|-
 
|-
 
| 05:46
 
| 05:46
−
|Press '''Enter'''
+
|Press '''Enter'''.
  
 
|-
 
|-
−
| 05:48
+
| 05:47
−
|Type '''./str3'''
+
|Type (dot slash)''' ./str3 '''
  
 
|-
 
|-
−
| 05:51
+
| 05:50
−
|The outpur is displayed as 1,0  
+
|The output is displayed as 1, 0.
  
 
|-
 
|-
−
| 05:55
+
| 05:54
−
| Come back to our program
+
|Come back to our program.
  
 
|-
 
|-
−
| 05:57
+
| 05:56
−
|Here we get 1  
+
|Here we get 1 and here we get as 0.
  
 
|-
 
|-
−
| 055:59
+
| 06:01
−
|and here we get as 0
+
|Let us come back to our slides.
−
 
+
−
|-
+
−
| 06:02
+
−
|Let us move back to our slides  
+
  
 
|-
 
|-
 
| 06:04
 
| 06:04
−
|Let us summarize,
+
|Let us summarize.
  
 
|-
 
|-
 
| 06:06
 
| 06:06
−
| In this tutorial we learned,
+
|In this tutorial we learned,String library functions-
  
 
|-
 
|-
−
| 06:08
+
| 06:09
−
|String library functions
+
| strlen()
  
 
|-
 
|-
−
| 06:09
+
| 06:11
−
| strlen()
+
| strcpy()  
  
 
|-
 
|-
−
| 06:11
+
| 06:13
−
| strcpy()
+
| strcmp() strncpy()  
  
 
|-
 
|-
−
| 06:13
+
| 06:16
−
| strcmp()
+
| and strncmp().
−
|-
+
−
|  06:15
+
−
| strncpy()
+
−
 
+
−
|-
+
−
|  06:17
+
−
| and strncmp()
+
−
 
+
−
 
+
−
 
+
  
 
|-
 
|-
−
| 06:20
+
| 06:19
−
|   As an assignemnt,
+
|As an assignemnt,  
  
 
|-
 
|-
 
| 06:21
 
| 06:21
−
|Write a C Program to concatenate String best and String bus.
+
|write a C Program to concatenate String 'best' and String 'bus'.  
  
 
|-
 
|-
Line 417: Line 369:
  
 
|-
 
|-
−
| 06:33
+
| 06:32
−
|Also explore the other functions in string library.
+
|Also explore the other functions in string library.  
  
 
|-
 
|-
−
|   06:37
+
| 06:36
−
|   Watch the video available at the link shown below http://spoken-tutorial.org /What\_is\_a\_Spoken\_Tutorial
+
|Watch the video available at the link shown below.
  
 
|-
 
|-
−
| 06:40
+
| 06:39
−
|It summarises the Spoken Tutorial project  
+
|It summarizes the Spoken Tutorial project.
  
 
|-
 
|-
−
| 06:43
+
| 06:42
−
|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.  
  
 
|-
 
|-
−
| 06:47
+
| 06:46
−
| The Spoken Tutorial Project Team  
+
|The Spoken Tutorial Project Team:
  
 
|-
 
|-
 
| 06:49
 
| 06:49
−
|Conducts workshops using spoken tutorials  
+
|Conducts workshops using spoken tutorials.
  
 
|-
 
|-
 
| 06:52
 
| 06:52
−
|Gives certificates to those who pass an online test  
+
|Gives certificates to those who pass an online test.
  
 
|-
 
|-
 
| 06:56
 
| 06:56
−
|For more details, please write to contact [at] spoken hyphen tutorial dot org
+
|For more details, please write to, contact@spoken-tutorial.org.
  
 
|-
 
|-
−
| 07:04
+
|07:03
−
| 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.
  
 
|-
 
|-
 
| 07:08
 
| 07:08
−
|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.
  
 
|-
 
|-
−
| 07:16
+
| 07:15
−
|More information on this Mission is available at: http://spoken-tutorial.org\NMEICT-Intro
+
|More information on this mission is available at the link shown below.
  
 
|-
 
|-
−
| 07:21
+
| 07:20
−
| This is Ashwini Patil from IIT Bombay.  
+
|This is Ashwini Patil from IIT Bombay, signing off.  
  
 
|-
 
|-
 
| 07:24
 
| 07:24
−
|Thank you for joining.  
+
|Thank you for joining.
−
 
+
−
|}
+

Latest revision as of 17:17, 8 March 2017

Time Narration
00:01 Welcome to the spoken-tutorial on String Library Functions in C.
00:07 In this tutorial we will learn
00:09 String Library Functions.
00:11 We will do this with the help of some examples.
00:15 To record this tutorial, I am using
00:18 Ubuntu Operating System version 11.10,
00:22 gcc Compiler Version 4.6.1.
00:27 Let us start with an introduction to string library functions.
00:31 These are the group of functions implementing operations on strings.
00:36 Various operations such as copying, concatenation, searching etc are supported.
00:44 Let us see some of the string library functions.
00:48 Here we have the strncpy function.
00:52 The syntax for this is strncpy(char str1, char str2, and int n );
01:02 It copies first n characters of string str2 into string str1.
01:09 example, char strncpy( char hello, char world, 2);
01:16 The output will be Wollo .
01:21 Here we have Wo from the string 2 and rest of the characters from string 1.
01:29 Now we will see strncmp function, the syntax for this is strncmp(char str1, char str2, and int n);
01:42 It will compare first n characters of string 2 with string 1.
01:48 example int strncmp(char ice, char icecream, and 2);
01:55 The output will be 0.
01:58 Now we will see how to use the string library functions.
02:02 I am going to show you some of the commonly used string functions.
02:07 I have already typed the program on the editor,
02:10 I will open it.
02:12 Here, we have the string length function.
02:15 Note that our file name is strlen.c.
02:20 In this, we will find the length of the string.
02:23 These are the header files as stdio.h and string.h.
02:29 This is our main() function.
02:31 Here we have a character variable 'arr'.
02:35 It stores a value 'Ashwini' .
02:38 Then we have an integer variable len1 .
02:42 Here we will find the length of the string using strlen function.
02:48 The result will be stored in 'len1'.
02:52 Then we print the string and the length of the string.
02:56 And this is our return statement.
02:59 Now let us execute the program.
03:01 Open the terminal window by pressing
03:04 Ctrl, Alt and T keys simultaneously on your keyboard.
03:09 To compile, type: "gcc" space "strlen.c" space “-o” space “str1”. Press Enter.
03:19 Type (dot slash) ./str1. Press Enter.
03:24 The output is displayed as
03:26 string = Ashwini, Length = 7
03:30 You can count here. 1,2,3,4,5,6, and 7.
03:37 Let us see another string function.
03:40 Here we have the string copy function.
03:43 Note that our file name is strcpy.c .
03:48 In this, we will copy the source string into the target string.
03:53 Here we have 'Ice' in the source string, it will be copied to the target string.
03:59 This is our strcpy function
04:02 Here we will print the source string and the target string.
04:07 Let us execute and see.
04:09 Come back to our terminal.
04:11 To compile, type gcc space strcpy.c space hyphen o space str2. Press Enter
04:20 Type (dot slash)./str2 . Press Enter .
04:24 The output is displayed as:
04:26 source string = Ice
04:29 target string = Ice
04:32 Now let us see another string function.
04:34 Now we will see the string compare function.
04:37 Note that our file name is strcmp.c.
04:42 In this, we will compare two strings.
04:46 Here we have character variables as str1 and str2 .
04:52 str1 stores the value as 'Ice' and str2 stores the value as 'Cream'.
04:58 Here we have integer variables as i and j.
05:03 In this we will compare the string using the strcmp function.
05:08 Here we compare str1 i.e 'Ice' with 'Hello'.
05:14 The result is stored in i.
05:16 In this we will compare string2 i.e 'Cream' with 'Cream'
05:23 The result is stored in j.
05:25 Then we print both the results.
05:28 And this is our return statement.
05:31 Let us execute the program.
05:33 Come back to our terminal.
05:35 To compile type gcc space strcmp.c space hyphen o space str3
05:46 Press Enter.
05:47 Type (dot slash) ./str3
05:50 The output is displayed as 1, 0.
05:54 Come back to our program.
05:56 Here we get 1 and here we get as 0.
06:01 Let us come back to our slides.
06:04 Let us summarize.
06:06 In this tutorial we learned,String library functions-
06:09 strlen()
06:11 strcpy()
06:13 strcmp() strncpy()
06:16 and strncmp().
06:19 As an assignemnt,
06:21 write a C Program to concatenate String 'best' and String 'bus'.
06:25 Hint: strcat(char str1, char str2);
06:32 Also explore the other functions in string library.
06:36 Watch the video available at the link shown below.
06:39 It summarizes the Spoken Tutorial project.
06:42 If you do not have good bandwidth, you can download and watch it.
06:46 The Spoken Tutorial Project Team:
06:49 Conducts workshops using spoken tutorials.
06:52 Gives certificates to those who pass an online test.
06:56 For more details, please write to, contact@spoken-tutorial.org.
07:03 Spoken Tutorial Project is a part of the Talk to a Teacher project.
07:08 It is supported by the National Mission on Education through ICT, MHRD, Government of India.
07:15 More information on this mission is available at the link shown below.
07:20 This is Ashwini Patil from IIT Bombay, signing off.
07:24 Thank you for joining.

Contributors and Content Editors

Krupali, PoojaMoolya, Pratik kamble, Sandhya.np14, Sneha

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