C - ポインタ変数に対するconst宣言２

const2.c

#include <stdio.h>

int main(int argc, const char *argv[])
{
    const char *p[] = { "foo", "bar", "baz" };
    char * const q[] = { "foo", "bar", "baz" };
    const char * const r[] = { "foo", "bar", "baz" };

    /**** const type *var ****/

    puts("");
    printf("p = { \"%s\", \"%s\", \"%s\" }\n", p[0], p[1], p[2]);

    /* error */
    /* p[0][0] = '\0'; */

    /* allowed */
    p[0] = "hoge";
    printf("p = { \"%s\", \"%s\", \"%s\" }\n", p[0], p[1], p[2]);

    /**** type * const var ****/

    puts("");
    printf("q = { \"%s\", \"%s\", \"%s\" }\n", q[0], q[1], q[2]);

    /* allowed but segv */
    /* q[0][0] = '\0'; */

    /* error */
    /* q[0] = "hoge"; */

    /**** const type * const var ****/

    puts("");
    printf("r = { \"%s\", \"%s\", \"%s\" }\n", r[0], r[1], r[2]);

    /* error */
    /* r[0][0] = '\0'; */

    /* error */
    /* r[0] = "hoge"; */

    return 0;
}