C语言结构体的字节对齐

#include <iostream>
#include <cstring>

using namespace std;

struct A{
int a;
short b;
char d;
char e[10];
};

struct B{
int a;
short b;
char *c;
char d;
char e[10];
};

int main(){

cout<<sizeof(A)<<endl;
cout<<sizeof(B)<<endl;
cout<<"short "<<sizeof(short)<<endl;
cout<<"int "<<sizeof(int)<<endl;
cout<<"long "<<sizeof(long)<<endl;
cout<<"char* "<<sizeof(char*)<<endl;

return 0;

}

20
32
short 2
int 4
long 8
char* 8