strtok() function in C Lanaguage

• strtok( ) function in C tokenizes/parses the given string using delimiter. Syntax for strtok( ) function is given below.

char * strtok ( char * str, const char * delimiters );

Example program for strtok() function in C Language:

• In this program, input string “Test,string1,Test,string2:Test:string3″ is parsed using strtok() function. Delimiter comma (,) is used to separate each sub strings from input string.

C

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#include <stdio.h> #include <string.h> int main () {   char string[50] ="Test,string1,Test,string2:Test:string3";   char *p;   printf ("String  \"%s\" is split into tokens:\n",string);   p = strtok (string,",:");   while (p!= NULL)   {     printf ("%s\n",p);     p = strtok (NULL, ",:");   }   return 0; }

Output:

String “Test,string1,Test,string2:Test:string3″ is split into tokens: Test string1 Test string2 Test string3

Other String functions in C Language:

• String.h header file supports all the string functions in C language. All the string functions are given below.

S.no	String functions	Description
1	strcat ( )	Concatenates str2 at the end of str1.
2	strncat ( )	appends a portion of string to another
3	strcpy ( )	Copies str2 into str1
4	strncpy ( )	copies given number of characters of one string to another
5	strlen ( )	gives the length of str1.
6	strcmp ( )	Returns 0 if str1 is same as str2. Returns <0 if strl < str2. Returns >0 if str1 > str2.
7	strcmpi ( )	Same as strcmp() function. But, this function negotiates case.  “A” and “a” are treated as same.
8	strchr ( )	Returns pointer to first occurrence of char in str1.
9	strrchr ( )	last occurrence of given character in a string is found
10	strstr ( )	Returns pointer to first occurrence of str2 in str1.
11	strrstr ( )	Returns pointer to last occurrence of str2 in str1.
12	strdup ( )	duplicates the string
13	strlwr ( )	converts string to lowercase
14	strupr ( )	converts string to uppercase
15	strrev ( )	reverses the given string
16	strset ( )	sets all character in a string to given character
17	strnset ( )	It sets the portion of characters in a string to given character
18	strtok ( )	tokenizing given string using delimiter

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