sizeof

#include <iostream>

using namespace std;

struct A
{
    long a1;
    short a2;
    int a3;
    int *a4;
};

int main()
{
    A temp;
    cout << sizeof(temp) << endl;
    cout << sizeof(temp.a1) << endl;
    cout << sizeof(temp.a2) << endl;
    cout << sizeof(temp.a3) << endl;
    cout << sizeof(temp.a4) << endl;

    return 0;
}