The difference of Overload,override,overwrite in C + + the detailed analysis _c language

overload (Overload): in a C + + program, you can represent several functions that are semantically and functionally similar to the same name, but the parameters or return values are different, including type, order, or function overload.
(1) The same range (in the same class);
(2) The function name is the same;
(3) different parameters;
(4) virtual keyword is optional.

Override (overwrite): refers to a derived class function that overrides a base class function, characterized by:
(1) different ranges (in derived classes and base classes, respectively);
(2) The function name is the same;
(3) the same parameter;
(4) The base class function must have the virtual keyword.

Overwrite (overriding): refers to the function of a derived class that masks a base class function with the same name as the following rule:
(1) If the function of the derived class has the same name as the function of the base class, but the parameters are different. At this point, the function of the base class is hidden, regardless of the virtual keyword (Note that you are not confused with overloading).

(2) If the function of the derived class has the same name as the function of the base class, and the parameters are the same, the base class function does not have the virtual keyword. At this point, the functions of the base class are hidden (note that you are confused with overrides).