ShreeSanaviAcademy.

Standard Library String Functions

The C compiler has a large set of valuable string handling library functions. Following table most commonly used functions along with their use.

Function	Use
strlen	Determines the string's length
strlwr	Converts a string to lowercase
strupr	Converts a string to uppercase
strcat	Appends one string at the end of another string
strncat	Appends first n characters of a string at the end of another
strcpy	Copies a string into another
strncpy	Copies first n characters of one string into another
strcmp	Compares two strings
strncmp	Compares first n characters of two strings
strcmpi	Compares two strings without regard to case ("i" denotes that this function ignores case)
stricmp	Compares two strings without regard to case (identical to strcmpi)
strnicmp	Compares first n characters of two strings without regard to case
strdup	Duplicates a string
strchr	Finds first occurrence of a given character in a string
strrchr	Finds last occurrence of a given character in a string
strstr	Finds first occurrence of a given string in another string
strset	Sets all characters of string to a given character

---

strcpy( )

This function copies the contents of one string into another. The base addresses of the source and target strings should be lacking to this function.

Example:

#include<stdio.h>
#include<string.h>
int main( )
{
char one[ ] = "shreesanaviacademy" ;
char two[20] ;
strcpy ( two, one ) ;
printf ( "\n First string = %s", one ) ;
printf ( "\n Second string = %s", two ) ;
return 0;
}

Output: 

 First string = shreesanaviacademy
 Second string = shreesanaviacademy
--------------------------------
Process exited after 2.442 seconds with return value 0
Press any key to continue . . .

---

strlen( )

This strlen( )  function counts a total number of characters present in a string.

Example:

#include<stdio.h>
#include<string.h>
int main( )
{
char arr[ ] = "shreesanavi" ;
int l1, l2 ;
l1 = strlen ( arr ) ;
l2 = strlen ( "shreesanaviacademy" ) ;
printf ( "\nstring = %s length = %d", arr, l1 ) ;
printf ( "\nstring = %s length = %d", "shreesanaviacademy", l2 ) ;
return 0;
}

Output: 

string = shreesanavi length = 11
string = shreesanaviacademy length = 18
--------------------------------
Process exited after 1.155 seconds with return value 0
Press any key to continue . . .