结构体大小问题

1 #include <stdio.h>
2 #include <string.h>
3
4 struct sss{
5     //int c;
6     long long s;
7     char k;
8 };
9
10 struct aaa{
11     char a;
12     struct sss b;
13     int s;
14     char k;
15 };
16
17 int main()
18 {
19     printf("%d\n", sizeof(struct sss));
20     printf("%d\n", sizeof(struct aaa));
21
22     return 0;
23 }