It may be at early binding, since polymorphism is used while coding to assign a reference variable to other variable of a a superclass or interface of itself. solved When does polymorphism occur [closed]
You don’t have to define seperate interfaces for this. You can also use a baseclass to achieve polymorphism. For more info check this page: Polymorphism – C# programming Example of using polymorphism in C#: using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace Animals { class Program { static void Main(string[] args) { … Read more
So, if this is just a thought-experiment, then the answer is “You can’t do that”. If you actually want a hierarchy where your derived classes have different types, you could do something like this: class Base { public: virtual void bar() = 0; }; class A: public Base { public: void bar() { … do … Read more
The two additional setting are printed by B‘s constructor. B‘s constructor calls A‘s constructor which then calls B‘s overridden SetNumber Function which prints setting. B‘s constructor is called twice and SetNumber is called directly twice leading to four Settings. solved Hello!!!. So in a quiz que were given the following classes and we were asked … Read more
It seems that you want to change the database type, from: std::vector <Employee> *EmployeeDB; this is a pointer to a vector, holding Employee instances. This means that the vector contains copies of employees, probably not what you want. To: std::vector <Employee*> EmployeeDB; This is a vector instance, holding pointers to Employees. You also should take … Read more
There’s 3 ways that I can think of that would work for you: Create a non-generic base class holding the shared field(s) Create a non-generic separate class holding the shared field(s) Create a non-generic type that holds these shared values, and reuse this inside your generic ones For the third one, since you say you … Read more
What is illegal is: Employee is an abstract base class. This line: Employee joe; is illegal on its own, it is creating an instance of your abstract class. joe = HourlyEmployee(); is a bad idea even if the classes were both complete as it would slice. joe is an object, not a reference. If HourlyEmployee … Read more
What this means is that the Manager class extends or implements the Employee class. The second part of your question is a little unclear to me. But an example of having to cast emp is if the Manager class has a specific method which the Employee class does not. You’d need to cast emp in … Read more
Your PrintDetails() method is printing the array without any kind of formatting (hence it’s just printing the array type) use string.Join to print the array delimenated by commas public override void PrintDetails() { Console.WriteLine(“Hi my name is ” + _name + ” and I am studying ” + string.Join(“,”, _subjects)); } ought to do it. … Read more
Shoe roshe = new Nike(“roshe”, 11, “black”, “fashion”, 129.0, false) String literals should be enclosed in double quotes. As for your change in size type, pass int array instead of int int s[] = {11,12,13}; Shoe roshe = new Nike(“roshe”, s, “black”, “fashion”, 129.0, false) or Shoe roshe = new Nike(“roshe”,new int[]{11, 12, 13} , … Read more
Since this is clearly a homework exercise, it is not appropriate for me to provide an answer directly. Instead, I have written a little program for you to demonstrate what the question means, and running it will provide an answer. You can try this out for yourself: public class Main { class A {} class … Read more
Your MessageRouter is missing default processing. Add DefWindowProc as shown LRESULT CALLBACK AbstractWindow::MessageRouter ( HWND hwnd, UINT message, WPARAM w_param, LPARAM l_param ) { AbstractWindow* abstract_window = 0; if ( message == WM_NCCREATE ) { abstract_window = ( AbstractWindow* ) ( ( LPCREATESTRUCT ( l_param ) )->lpCreateParams ); SetWindowLong ( hwnd, GWL_USERDATA, long ( abstract_window … Read more
yes, a PVF can have parameters. virtual void playCard(Player enemyPlayer) = 0; here = 0 (is not assigning), Simply we are informing to compiler that function will be pure and does not having any body(where its declared, in that class), but it can have parameter. From the n4659 C++ standard A pure virtual function need … Read more
The problem is that the compiler doesn’t know where the Dog or Cat class is. Here are the steps to telling the compiler how to create a new Dog or new Cat Make sure that you have a Dog.java and a Cat.java file in your project. Even if they are in the same folder as … Read more
For many reasons – code maintainability, extensibility, concision, reliability, minimising the amount of code that needs to be recompiled/redistributed to pick up changes in some library code it uses – you should almost always use virtual functions rather that writing your own switching mechanisms. If you need to ask about it on stackoverflow, I’d go … Read more