C++ 查看类的内存大小

#include <iostream>

using namespace std;

class Demo
{
private:
int x;
double y;
};

int main()
{
cout << sizeof(Demo) << endl;
cout << sizeof(char) << endl;
cout << sizeof(int) << endl;
cout << sizeof(double) << endl;

cout << sizeof(Demo*) << endl;
cout << sizeof(char*) << endl;
cout << sizeof(int*) << endl;
cout << sizeof(double*) << endl;
return 0;
}