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char const *p;
void dont_do_this(void) {
    char const str[] = "This will change";
    p = str; /* dangerous */
    /* ... */
}

void innocuous(void) {
    char const str[] = "Surprise, surprise";
}
/* ... */
dont_do_this();
innocuous();
/* now,p itmight is likely that p is be pointing to "Surprise, surprise" */

void this_is_OK(void) {
    char const str[] = "Everything OK";
    char const *p = str;
    /* ... */
}
/* pointer p is now inaccessible outside the scope of string str */