-sharpinclude <stdio.h>

struct test{
    int i;
    short c;
    char *p;
};
int main(void)
{
    struct test *pt = NULL;
    printf("%p\n", &(pt->i));
    printf("%p\n", &(pt->c));
    printf("%p\n", &(pt->p));
    printf("%lu\n", sizeof(struct test));
    return 0;
}

Windows 10x64, and it is found that size is 16 bytes

PS C:\Users\salamander\Desktop> ./test
0000000000000000
0000000000000004
0000000000000008
16

p become 00000000000008?
guess that 2 bytes are added after short, which is 4 bytes, and the pointer itself should be 8 bytes