All members are static. Of course they are, because if you can’t instantiate an object from that class, why would there be any non-static members? solved Can I have a non-static data member in a static class?
static int a; This declares the static variable. That tells the compiler that this field exists and would be of type int. This is useful information for compiling the code. But the variable still needs to be defined. That is some translation unit(and exactly one translation unit) needs to allocate the memory for this variable. … Read more