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I have not known that, but now. Thank you.
AndiPersti thank you for interesting links.

Do you have same example? For I don't understand how it works.
That the point I do not understand. It receives a source string and returns tokens terminated by '\0'.
But it doesn't alter the...

Thank you for your help.
strtok() works now as I will, although the program is not ready yet.
Here the code.

#include <stdio.h>
#include <string.h>
#include <stdlib.h>

void get_string(char...

What is wrong in my code?

#include <stdio.h>
#include <string.h>
#include <stdlib.h>

int main(void)
{
char *pos1, *pos2;
char string[256];

I have to find out, whether some word is contained more than one time in the string.

Hallo!
How can I reset strtoc()?
After I have caled it twice "strtok(string, " ") ",
it works not fine "strtok(NULL, " ")".
Is there a solution?

#include <stdio.h>
#include <string.h>...