Thread: Understading how strtok works...

I've found some strtok example on the net, which is this: http://www.phim.unibe.ch/comp_doc/c_...MPLES/strtok.c

I can easly understand the code and I've already adapted it to my own code, however, there's something I don't understand, which is this line (more exactly the thing in bold):

while ( (sub_string=strtok(NULL, " ")) != NULL)

How come strtok() will get the other strings out of test_string if only I have there in the function parameter is NULL? Where does he get the data from?

Just want to understand that...

>>Not to mention that strtok() also modifies the string in the process, which comes as a shock to the average newbie.

[rant]It shouldn't be shocking if people would learn to read the manual (RTFM)! or read their text books. But some newbes prefer to shoot from the hip and toss together a program using functions they have no clue what they do.[/rant]

lol... actually, after playing with it and seeing that example I think I got how it work and as I said before, my program woks pretty good with it, the way I code it. I only didn't understand that little thing that you have now clarified for me

Thank won't change anything in my app cause I wasn't having any trouble, I just wanted to know how it was getting the string.

thanks