#include <stdio.h>

struct mblock {
    struct mblock *next;
    size_t size;
    char mem_area[];
};

struct mblock_without_fam {
    struct mblock *next;
    size_t size;
};

int main() {
    struct mblock mblock;
    printf("sizeof(mblock_without_fam) = %zu\n", sizeof(struct mblock_without_fam));
    printf("sizeof(mblock) = %zu\n", sizeof(mblock));
    printf("sizeof(mblock.next) = %zu\n", sizeof(mblock.next));
    printf("sizeof(mblock.size) = %zu\n\n", sizeof(mblock.size));

    // Compiler error:
    // invalid application of 'sizeof' to an incomplete type 'char[]'
    //printf("sizeof(mblock.mem_area): %zu\n", sizeof(mblock.mem_area));

    printf("&mblock = %p\n", &mblock);
    printf("&mblock.next = %p\n", &mblock.next);
    printf("&mblock.size = %p\n", &mblock.size);
    printf("&mblock.mem_area = %p\n", &mblock.mem_area);

    printf("&mblock + 1 = %p\n", &mblock + 1);
}