[C++] struct memory allocation

　　　　　　　　Four-byte alignment

 1 typedef struct user  USER;
 2 typedef struct employee E;
 3 struct user{
 4
 5     char name[10];  //take 12 bytes
 6     int age; //take 4 bytes
 7     short sex;//take 4 bytes
 8     char blood;//take 1 bytes but in  the 4 bytes of sex
 9 };
10 struct employee{
11
12     char name[5];  //take 8 bytes
13     int age; //take 4 bytes
14     char blood;//take 4 bytes
15 };
16 int main(){
17
18     printf("%d\n", sizeof(USER));// 12+4+4
19     printf("%d\n", sizeof(E));// 8+4+4
20     system("pause");
21 }