C/C++中对结构体进行引用和指针定义所占用的内存大小

#include<iostream>
using namespace std;
struct Test
{
   int a[5];
   int *b;
   //double &b;
   //char &b;
};

int main()
{

   Test test = {};
   cout << "引用结构体对象占用的内存空间字节大小为：" << sizeof(test) << endl;
   Test *test1;
   cout << "指针结构体对象占用的内存空间字节大小为：" << sizeof(test1) << endl;

return 0;
}