#include <iostream>

struct A
{
    int a;
};
 
struct D: A
{
    int c;
};
 
int main(int argc, char* argv[])
{
    std::cout << "D().a == " << D().a << std::endl;
    std::cout << "D().c == " << D().c << std::endl;
 
    return 0;
}

D().a == 0
D().c == 0