#pragma pack test

pack.cpp

#include <iostream>

#pragma pack(4)
struct name
{
    short a;
    char b;
    short c;
    int d;
    short e;
    double f;
    char g;
};

int main()
{
    name ee;
    std::cout << sizeof(name) << std::endl;
    std::cout << (char *)&ee.b-(char *)&ee.a << std::endl;
    std::cout << (char *)&ee.c-(char *)&ee.b << std::endl;
    std::cout << (char *)&ee.d-(char *)&ee.c << std::endl;
    std::cout << (char *)&ee.e-(char *)&ee.d << std::endl;
    std::cout << (char *)&ee.f-(char *)&ee.e << std::endl;
    std::cout << (char *)&ee.g-(char *)&ee.f << std::endl;
    std::cout << sizeof(name) - ((char *)&ee.g - (char *)&ee.a) << std::endl;
}