C – strtok() function

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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:

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.

Output:

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

C String functions:

  • String.h header file supports all the string functions in C language. All the string functions are given below.
  • Click on each string function name below for detail description and example programs.
String functions
Description
strcat ( ) Concatenates str2 at the end of str1
strncat ( ) Appends a portion of string to another
strcpy ( ) Copies str2 into str1
strncpy ( ) Copies given number of characters of one string to another
strlen ( ) Gives the length of str1
strcmp ( ) Returns 0 if str1 is same as str2. Returns <0 if strl < str2. Returns >0 if str1 > str2
strcmpi ( ) Same as strcmp() function. But, this function negotiates case.  “A” and “a” are treated as same.
strchr ( ) Returns pointer to first occurrence of char in str1
strrchr ( ) last occurrence of given character in a string is found
strstr ( ) Returns pointer to first occurrence of str2 in str1
strrstr ( ) Returns pointer to last occurrence of str2 in str1
strdup ( ) Duplicates the string
strlwr ( ) Converts string to lowercase
strupr ( ) Converts string to uppercase
strrev ( ) Reverses the given string
strset ( ) Sets all character in a string to given character
strnset ( ) It sets the portion of characters in a string to given character
strtok ( ) Tokenizing given string using delimiter

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