strtok() manipulation function is used to split a string into tokens. It returns a pointer to next token in the "str1", the characters of "str2" are the delimiters for the token. Function returns a NULL pointer if there are no tokens to return. When this function is called for the first time, "str1" point to string being tokenized and then a NULL pointer is used for "str1". Different delimiters can be used every time the strok() is called.

    char *strtok (char *str1, const char *str2);

   #include <stdio.h>
   #include <cstring.h>
   int main ()
    {
      char str1[] = "Its* time*have* fun";
      char str2[] = "*";
      char * pnt;
      pnt=strtok( str1, str2 );
      while( pnt!= NULL ) 
       {
         printf( "Tokenized string using *  is:: %s\n", pnt );
         pnt = strtok( NULL, str2 );
       }
     }

   Tokenized string using *  is:: Its
   Tokenized string using *  is:: time
   Tokenized string using *  is:: have
   Tokenized string using *  is:: fun

In the above example, "strtok()" manipulation function is used tokenize based on the delimiter "*". It splits it into tokens by the delimiters everytime it is called.