#include <iostream>

// declaration and definition
static int w;

struct tester
{
    int x;
    static int y;
    static int z;
};

// definition
int tester::z = 3;

int main(int argc, char** argv)
{
    // 4 bytes, no allocation for the static var
    std::cout << "sizeof tester " << sizeof(tester) << std::endl;

    // this will not compile. 
    // y has been declared but not defined
    // std::cout << "tester::y = " << tester::y << std::endl;

    std::cout << "tester::z = " << tester::z << std::endl;

    std::cout << "w = " << w << std::endl;

    return 0;
}