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

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

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

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|In this tutorial we will learn,   

|In this tutorial we will learn,   

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|String Library Functions  

|String Library Functions  

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|We will do this with the help of some examples  

|We will do this with the help of some examples  

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|To record this tutorial, I am using  

|To record this tutorial, I am using  

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| Ubuntu Operating System version 11.10,  

| Ubuntu Operating System version 11.10,  

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|gcc Compiler Version 4.6.1  

|gcc Compiler Version 4.6.1  

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

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

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

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

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

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

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|Let us see some of the string library functions  

|Let us see some of the string library functions  

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

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

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

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

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

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

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

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

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

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

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|Here we have '''Wo''' from 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  

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|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) '''  

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

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

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

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

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|The output will be 0  

|The output will be 0  

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

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

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|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.  

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|I have already typed the program on the editor,  

|I have already typed the program on the editor,  

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| I will open it  

| I will open it  

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|Here we have the string length function  

|Here we have the string length function  

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

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

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|In this we will find the length of the string  

|In this we will find the length of the string  

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

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

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|This is our main function  

|This is our main function  

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

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

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

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

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

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

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

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

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|The result will be stored in len1  

|The result will be stored in len1  

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

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

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|And this is our return statement  

|And this is our return statement  

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|Now let us execute the program  

|Now let us execute the program  

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|Open the terminal window by pressing  

|Open the terminal window by pressing  

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

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

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

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

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

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

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|The output is displayed as  

|The output is displayed as  

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

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

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

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

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| Let us see another string function  

| Let us see another string function  

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

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

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

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

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

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

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|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  

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|This is our strcpy function

|This is our strcpy function

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

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

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|Let us execute and see   

|Let us execute and see   

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|Come back to our terminal  

|Come back to our terminal  

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

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

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

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

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|The output is displayed as  

|The output is displayed as  

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|'''source string = Ice '''

|'''source string = Ice '''

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|'''target string = Ice '''

|'''target string = Ice '''

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| Now let us see another string function  

| Now let us see another string function  

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|Now we will see the string compare function

|Now we will see the string compare function

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

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

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|In this we will comapre two strings  

|In this we will comapre two strings  

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

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

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

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

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|Here we have interger variables as i and j  

|Here we have interger variables as i and j  

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

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

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

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

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|The result is stored in i  

|The result is stored in i  

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

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

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|The result is stored in j  

|The result is stored in j  

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|Then we print both the results  

|Then we print both the results  

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|And this is our return statement  

|And this is our return statement  

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|Let us execute the program.  

|Let us execute the program.  

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|Come back to our terminal.   

|Come back to our terminal.   

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

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

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|Press '''Enter'''

|Press '''Enter'''

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

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

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|The outpur is displayed as 1,0  

|The outpur is displayed as 1,0  

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|Come back to our program  

|Come back to our program  

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|Here we get 1 and here we get as 0  

|Here we get 1 and here we get as 0  

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|Let us come back to our slides  

|Let us come back to our slides  

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|Let us summarize,  

|Let us summarize,  

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|In this tutorial we learned,  

|In this tutorial we learned,  

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|String library functions  

|String library functions  

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|strlen()  

|strlen()  

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|strcpy()  

|strcpy()  

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|strcmp()  

|strcmp()  

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|strncpy()  

|strncpy()  

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|and strncmp()  

|and strncmp()  

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|As an assignemnt,  

|As an assignemnt,  

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

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

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

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

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|Also explore the other functions in string library.  

|Also explore the other functions in string library.  

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|Watch the video available at the link shown below

|Watch the video available at the link shown below

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|It summarizes the Spoken Tutorial project  

|It summarizes the Spoken Tutorial project  

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|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  

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|The Spoken Tutorial Project Team  

|The Spoken Tutorial Project Team  

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|Conducts workshops using spoken tutorials  

|Conducts workshops using spoken tutorials  

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|Gives certificates to those who pass an online test  

|Gives certificates to those who pass an online test  

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

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

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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  

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|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

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

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

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|This is Ashwini Patil  from IIT Bombay signing of.  

|This is Ashwini Patil  from IIT Bombay signing of.  

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|Thank you for joining.

|Thank you for joining.