Initializing unsized arrays

/* 1207.c: Initializing unsized arrays */
#include <stdio.h>

main()
{
    char array_ch[] = {'C', ' ' ,
    'i', 's', ' ' ,
    'p', 'o', 'w', 'e', 'r',
    'f', 'u', 'l', '!', '\0'};
    int list_int[][3] = {
    1, 1, 1,
    2, 2, 8,
    3, 9, 27,
    4, 16, 64,
    5, 25, 125,
    6, 36, 216,
    7, 49, 343};

    printf("The size of array_ch[] is %d bytes.\n", sizeof (array_ch));
    printf("The size of list_int[][3] is %d bytes.\n", sizeof (list_int));
    return 0;
}