i'm learnign c++ (i know, it's old, but i need it!)
i'm confused about abstract classes and polymorphism. It's not clear for me how to use abstract classes and pointers to have polyphormism, because if i use normal classes declaration, without abstract i can have something similar to abstract+pointers but with less code. In fact when i use abstract classes, for every function (or method) of a child class i need to declare an abstract, i don't understand this, because, if i hae understood right, every time i change the child class with a function, i have to change the parent class with an abstract. What i miss?