C-and-C++/C3/String-Library-Functions/English-timed

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 filename 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 lenght 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 fuction
03:43	Note that our filename 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 filename is strcmp.c
04:42	In this we will comapre 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 interger variables as i and j
05:03	In this we will compare the string using the strcmp function
05:08	Here we compare str1 ie: 'Ice' with 'Hello'
05:14	The result is stored in i
05:16	In this we will compare string2 ie: '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 outpur 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,
06:07	String library functions
06:09	strlen()
06:11	strcpy()
06:13	strcmp()
06:14	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 of.
07:24	Thank you for joining.

Contributors and Content Editors

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