gistfile1.cpp

#include <stdio.h>
#include <atomic>

int main(int argc, char** argv)
{

    volatile std::atomic<int> x;

    volatile int i;
    for (i=0; i<100000000; i++)
    {
        x.store(i);
    }

    printf("%d %d\n", x.load(), sizeof(x));
}


#include <stdio.h>

int main(int argc, char** argv)
{

    volatile int x;

    volatile int i;
    for (i=0; i<100000000; i++)
    {
        x=i;
    }

    printf("%d %d\n", x, sizeof(x));
}