/* The same letters in two different homes.
 *
 * The array holds its own cells, so you may write to them. The pointer holds an
 * address, and the letters it points at are stored where writing is not allowed.
 * Build with -DWRITE_THROUGH_LITERAL to watch the second case fail on purpose.
 */
#include <stdio.h>

int main(void) {
    char copy[] = "quiet";   /* your own cells, filled from the letters */
    char *literal = "quiet"; /* one pointer, aimed at read-only storage */

    copy[0] = 'Q';
    printf("copy:    %s\n", copy);

#ifdef WRITE_THROUGH_LITERAL
    literal[0] = 'Q'; /* undefined behaviour: there is nothing to write to */
#endif

    literal = "loud"; /* moving the pointer is fine; it is only an address */
    printf("literal: %s\n", literal);
    return 0;
}