Static members of the class do not occupy the number of bytes of the class object
1. The number of bytes occupied by an empty class is 1;
2. The number of bytes occupied by the int integer variable is 4;
class Person
{
int m_A; //非静态成员变量，属于类的对象上
static int m_B; //静态成员变量，不属于类的对象上
void func(){
} // 非静态成员函数，不属于类的对象上
static void func1(){
} //静态成员函数，不属于类的对象上
};
3. Test code
Person p1;
cout << "size of p1=" <<sizeof(p1)<< endl;
4. Test results
size of p1=4
请按任意键继续. . .
In summary, the conclusions are as follows:
static member variables and functions, on objects that do not belong to the class;
non-static member variables, on objects that belong to the class;
non-static member functions, on objects that do not belong to the class;