[abstract] Forum Topics

Hello good day. Here is my problem: I have retrieved some a couple sets of data from my sql database and saved them in ArrayLists of (custom)types <Student> and <Subject>. I am using a single Table. I want to create a custom AbstractDataModel that displays the data from the ArrayList<Student>. …

I have an abstract class CArticle and two derived classes CBook and CMagazine. I also have a class CLibrary where i want to add articles. Its members are an int variable to count the articles and a double pointer of CArticle. I have the following main function: int main() { …

Currently I have something like this: class FileWritter{ ofstream file; public: FileWritter(string filename,A_Class a){//A_Class is class which has defined the >> and the << operators file.open(filename.c_str()); file<<a; } ~FileWritter(){ file.close(); } }; what I want is to have something like this: template <class AbstractClass> class FileWritter{ ofstream file; public: FileWritter(string …

So I have been working on this project for quite some time and I can't figure out why I keep getting an "Illegal Start of Expression" error. I tried moving the variables above the main method and that only returned the same error but instead of the error occuring at …

Hi all, this is a homework assignment that I'm not sure how to begin with. We are given all the code and I just need to finish a function to convert digits to words. For example, the string "1, 2, and 3." becomes "One, Two, and Three." The String "10" …

Hello! I'm doing my first homework assignment with abstract classes and interfaces. I have a few questions: (1) I know that a class must be saved on the computer as, for example, Class.java. Is this the same for abstract classes? How are interfaces supposed to be saved? Do they need …

I'm working on a program for an intro to java class and am supposed to use the following interface: [CODE]public Interface Animal{ //The animal is first supposed to "speak" and then it gets to eat //As long as the food supply lasts public void feed(); //The animal eats public void …

Hello, I need to update my older Autodesk plug-in. And I am having troubles get it through. (They changed one function) This is a new definition which I cannot change: [CODE] CoreExport virtual void EnumAuxFiles(AssetEnumCallback& assetEnum, DWORD flags);[/CODE] And here is my code: [CODE] class CheckFileNames: public AssetEnumCallback { public: …

I'm getting into some territory I have never treaded before.... What I have is an Abstract class "Person" with an abstract class "Employee" that extends "Person" and then three concrete classes within "Employee" named: Agent, Accountant, and WebDesigner. sudo: [CODE]abstract class Person{ abstract class Employee extends Person implements myInterface{ class …

Hi I want to make an abstract method. But I always get the error " cannot declare a body because it is marked abstract." When I delete the return then I get the error than I need a return. can someone help me please [CODE] public abstract Graphics drawRectangle(Graphics drawarea) …

Hi :) i am new in C# and i am a little confused with the abstruct, virtual and override terms in C#... why they are good for? i tried to google it but i got more confused... for example - i am making a chess program and i made a …

Hey all:) I'm learning Java and I'm having a little trouble on a polymorphic write-to-file function. Let me quickly explain my project: I have an abstract class Mammal, with non-abstract children Horse, Cow etc. I have a Main program that creates a couple Horses and Cows, and store these in …

Ok it's all about to create 4 class Class a , class b derived from a and c derived from b and test class Speed is an instance variable in class b and c. The method are : Start() -a method of all class to print the message"hee" override the …

As all textbooks on C# will tell you, you cannot instantiate an abstract class. I believe the keyword [B]abstract [/B]was intended for that purpose. So can anyone tell me why I can do something like this: [CODE=c#]abstract class TwoDShape { // some code here } class test { static void …