c - strtok program crashing

Question

the program for strtok given on http://www.opengroup.org/onlinepubs/000095399/functions/strtok.html crashes everytime..

#include <string.h>
...
char *token;
char *line = "LINE TO BE SEPARATED";
char *search = " ";


/* Token will point to "LINE". */
token = strtok(line, search);


/* Token will point to "TO". */
token = strtok(NULL, search);

If I use a char array for variable 'line', it works. i.e. char line[] = "LINE TO BE SEPARATED" works.

Kindly explain.

Answer 1

strtok modifies the input string line.

char *line = "LINE TO BE SEPARATED";

In this case line points to the read-only memory. Hence, cannot be modified. You need to pass char array for strtok.