Summer 2015 part2 Day3 quiz2, about reentrancy

quiz2.c

#include <stdio.h>
#include <string.h>
int main(void)
{
char test[80], blah[80];
     char *sep = "\\/:;=-";
     char *word, *phrase, *brkt, *brkb;

     strcpy(test, "This;is.a:test:of=the/string\\tokenizer-function.");
     //Note strtok is obsoleted and not reentrant 
     for (word = strtok(test, sep);
          word;
          word = strtok(NULL, sep))//strtok: a function that stores the "state" of the parameter passed to it.
     {
         strcpy(blah, "blah:blat:blab:blag");

          //strtok_r is reentrant for it stores the last state in '&brkb'
          //char* strtok_r(char *restrict str, const char *restrict sep, char **restrict lasts);
         for (phrase = strtok_r(blah, sep, &brkb);
              phrase;
              phrase = strtok_r(NULL, sep, &brkb))
         {
             printf("So far we're at %s:%s,  brkb:%s\n", word, phrase,brkb);
         }
     }
     return 0;
}

execution result
So far we're at This:blah, brkb:blat:blab:blag
So far we're at This:blat, brkb:blab:blag
So far we're at This:blab, brkb:blag
So far we're at This:blag, brkb:(null)
So far we're at is.a:blah, brkb:blat:blab:blag
So far we're at is.a:blat, brkb:blab:blag
So far we're at is.a:blab, brkb:blag
So far we're at is.a:blag, brkb:(null)
So far we're at test:blah, brkb:blat:blab:blag
So far we're at test:blat, brkb:blab:blag
So far we're at test:blab, brkb:blag
So far we're at test:blag, brkb:(null)
So far we're at of:blah, brkb:blat:blab:blag
So far we're at of:blat, brkb:blab:blag
So far we're at of:blab, brkb:blag
So far we're at of:blag, brkb:(null)
So far we're at the:blah, brkb:blat:blab:blag
So far we're at the:blat, brkb:blab:blag
So far we're at the:blab, brkb:blag
So far we're at the:blag, brkb:(null)
So far we're at string:blah, brkb:blat:blab:blag
So far we're at string:blat, brkb:blab:blag
So far we're at string:blab, brkb:blag
So far we're at string:blag, brkb:(null)
So far we're at tokenizer:blah, brkb:blat:blab:blag
So far we're at tokenizer:blat, brkb:blab:blag
So far we're at tokenizer:blab, brkb:blag
So far we're at tokenizer:blag, brkb:(null)
So far we're at function.:blah, brkb:blat:blab:blag
So far we're at function.:blat, brkb:blab:blag
So far we're at function.:blab, brkb:blag
So far we're at function.:blag, brkb:(null)