C-and-C++/C3/String-Library-Functions/English-timed
From Script | Spoken-Tutorial
Revision as of 11:37, 26 March 2014 by PoojaMoolya (Talk | contribs)
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, |
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
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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
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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,
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06.07 | String library functions |
06.09 | strlen() |
06.11 | strcpy() |
06.13 | strcmp()
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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
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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. |