View source for C-and-C++/C3/String-Library-Functions/English-timed

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|'''Time'''

|'''Narration'''


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| 00.01
|Welcome to the spoken-tutorial on '''String Library Functions in C''' 


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| 00.07
|In this tutorial we will learn,   

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| 00.09
|String Library Functions 

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| 00.11
|We will do this with the help of some examples 

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| 00.15
|To record this tutorial, I am using 

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| 00.18
| Ubuntu Operating System version 11.10, 

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| 00.22
|gcc Compiler Version 4.6.1 

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| 00.27
|Let us start with an introduction to string library functions. 

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| 00.31
|These are the group of functions implementing operations on strings. 

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|00.36
|Various operations such as copying, concatenation, searching etc are supported.  

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|00.44
|Let us see some of the string library functions 

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|00.48
|Here we have the '''strncpy''' function 

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|00.52
|The syntax for this is '''strncpy(char str1, char str2, and int n ) '''

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|01.02
|It copies first n characters of string '''str2 ''' into string '''str1'''

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| 01.09
|example, '''char strncpy( char hello, char world, 2)'''

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| 01.16
|The output will be '''Wollo '''

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|01.21
|Here we have '''Wo''' from the string 2 and rest of the characters from string 1 

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| 01.29
|Now we will see '''strncmp''' function, the syntax for this is '''strncmp(char str1, char str2, and int n) ''' 

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| 01.42
|It will compare first n characters of string 2 with string 1 

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| 01.48
|example''' int strncmp(char ice, char icecream, and  2);''' 

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|01.55
|The output will be 0 

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| 01.58
|Now we will see how to use the string library functions. 

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| 02.02
|I am going to show you some of the commonly used string functions. 

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|02.07
|I have already typed the program on the editor, 

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|02.10
| I will open it 

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|02.12
|Here we have the string length function 

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|02.15
|Note that our filename is '''strlen.c. '''

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|02.20
|In this we will find the length of the string 

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|02.23
|These are the header files as '''stdio.h''' and '''string.h. '''

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|02.29
|This is our main function 

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| 02.31
|Here we have a character variable ''' 'arr', '''

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| 02.35
|It stores a value ''' 'Ashwini' '''

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| 02.38
|Then we have an integer variable '''len1 '''

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| 02.42
|Here we will find the lenght of the string using strlen function 

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| 02.48
|The result will be stored in len1 

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| 02.52
|Then we print the string and the length of the string. 

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|02.56
|And this is our return statement 

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|02.59
|Now let us execute the program 

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|03.01
|Open the terminal window by pressing 


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| 03.04
|'''Ctrl, Alt''' and '''T''' keys simultaneously on your keyboard 

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| 03.09
| To compile Type:'''  "gcc" ''' space ''' "strlen.c" ''' space ''' “-o”''' space''' “str1”'''. Press Enter 

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| 03.19
|Type (dot slash)''' ./str1.''' Press Enter 

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| 03.24
|The output is displayed as 

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| 03.26
|'''string = Ashwini, Length = 7 '''

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|03.30
|You can count here. 1,2,3,4,5,6, and 7 

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| 03.37
| Let us see another string function 

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| 03.40
|Here we have the '''string copy''' fuction  

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| 03.43
|Note that our filename is '''strcpy.c '''

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| 03.48
|In this we will copy the source string into the target string 

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| 03.53
|Here we have Ice in the source string, it will be copied to the target string 

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| 03.59
|This is our strcpy function

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| 04.02
|Here we will print the source string and the target string 

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| 04.07
|Let us execute and see  

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| 04.09
|Come back to our terminal 

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| 04.11
| To compile type '''gcc '''space '''strcpy.c''' space hyphen ''' o''' space '''str2'''. Press '''Enter'''


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| 04.20
|Type (dot slash)'''./str2 ''' .Press '''Enter '''

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| 04.24
|The output is displayed as 

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| 04.26
|'''source string = Ice '''

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| 04.29
|'''target string = Ice '''

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| 04.32
| Now let us see another string function 

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| 04.34
|Now we will see the string compare function

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| 04.37
|Note that our filename is '''strcmp.c'''

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| 04.42
|In this we will comapre two strings 

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| 04.46
|Here we have character variables as '''str1''' and '''str2 ''' 

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| 04.52
|'''str1''' stores the value as ''' 'Ice'''' and '''str2''' stores the value as ''' 'Cream'.'''

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| 04.58
|Here we have interger variables as i and j 

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| 05.03
|In this we will compare the string using the strcmp function 

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| 05.08
|Here we compare str1 ie: 'Ice' with 'Hello' 

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| 05.14
|The result is stored in i 

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| 05.16
|In this we will compare string2 ie: 'Cream' with 'Cream' 

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| 05.23
|The result is stored in j 

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| 05.25
|Then we print both the results 

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| 05.28
|And this is our return statement 

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| 05.31
|Let us execute the program. 

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| 05.33
|Come back to our terminal.  

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| 05.35
|To compile type '''gcc''' space '''strcmp.c''' space hyphen '''o''' space '''str3'''

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| 05.46
|Press '''Enter'''

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| 05.47
|Type (dot slash)''' ./str3 '''

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| 05.50
|The outpur is displayed as 1,0 

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| 05.54
|Come back to our program 

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| 05.56
|Here we get 1 and here we get as 0 

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| 06.01
|Let us come back to our slides 

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| 06.04
|Let us summarize, 

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| 06.06
|In this tutorial we learned, 


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| 06.07
|String library functions 

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| 06.09
|strlen() 

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| 06.11
|strcpy() 

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| 06.13
|strcmp() 


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| 06.14
|strncpy() 

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| 06.16
|and strncmp() 

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| 06.19
|As an assignemnt, 

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| 06.21
|Write a C Program to concatenate String best and String bus. 

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| 06.25
|Hint: strcat(char str1, char str2);

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| 06.32
|Also explore the other functions in string library. 

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| 06.36
|Watch the video available at the link shown below

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| 06.39
|It summarizes the Spoken Tutorial project 

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| 06.42
|If you do not have good bandwidth, you can download and watch it 

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| 06.46
|The Spoken Tutorial Project Team 

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| 06.49
|Conducts workshops using spoken tutorials 

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| 06.52
|Gives certificates to those who pass an online test 

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| 06.56
|For more details, please write to, contact@spoken-tutorial.org 


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|07.03
|Spoken Tutorial Project is a part of the Talk to a Teacher project 

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| 07.08
|It is supported by the National Mission on Education through ICT, MHRD, Government of India

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| 07.15
|More information on this Mission is available at the link shown below

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| 07.20
|This is Ashwini Patil  from IIT Bombay signing of. 

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| 07.24
|Thank you for joining.