1,089 Topics
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 | HI,..i've been working on this simple project that i need to submit it tomorrow. I really in rushing a little bit. But while i working on this oop project, my program give the strange little fatal error about my query which is this [B]Fatal error: Call to a member function … |
 | [B]Beginner's Guide to C++0x: The Big Five - Implementing a Resource-holding RAII Class[/B] This tutorial will show how to implement a [I]resource-holding class[/I] showing practical use of [I]C++0x features[/I]. A resource-holding class is any class which holds, with its data members, a resource which could include: [LIST] [*]dynamically allocated memory … |
| | this is a piece of my header file that is a template and my implementtion file that is using it.I keep getting errors and dont know why,any help would be appreciated. [CODE]template<class T> class List { public: private: T *list; int size; int numElements; bool isValid(int location) const; }; [/CODE] … |
| | I have been tasked with building an application that maintains a simple Student DB to store and process marks of students of 5 departments with 4 batches of students in each dept. I first thought of developing a UI-dataAccess style application. But Was unable to process because of various complexities … |
| | I am a graduate in comp sci & technology.[FRESHER] I want to apply for job in IT companies, but they emphasize on knowing JAVA. I know C/C++, & I am well-verse with OOP concepts. But I dont like Java that much. I must learn this Prog. lang for getting a … |
| | I am writing some application for Android. Here my app receives sms and as soon as it receives, it launches another activity,say a browser with some url supplied. So here, I need two classes, broadcastReceiver( to receive sms) and Activity. But in java i can inherit only 2 classes. Since …  |
| | Hi, I've seen a program called guessing game in a book. There are basically 3 players in the game. The program generates a random number and the players guess for that number. I wrote my own code for it and need your advice on how to improve the Object Oriented … |
| | hey all, I know this might seem like a basic question but we haven't really been taught it at university and I was getting curious. Once you've created your program and have all your relevant java classes/package and it has been compiled where do you find the .exe and how … |
 | So i haven't figured out what the point of constructors are i am just learning C++ and am seriously having trouble with it, i do not get why...well i kind of get default constructors because it initializes the variables but what about a constructor with arguments and the member function  |
| | I am experiencing unexpected performance degradation when using vectors with classes. I have a csv_File class that reads in a csv file and stores the contents in a 2D vector. There's a member function that allows access, e.g. [CODE] csv_File file("file.csv"); file.access(2,2);[/CODE] To access the 2,2 element. Then, I have … |
| | Hi! I've been making a rather large (but not huge, by any means) program and it needs, or so I think, a couple of classes and I want them to use inheritance to make my life easier. However, when I try to include all of my files in the main … |
| | Hi, I am trying to make a bank application that has two interfaces.One is the employee interface that lets employees to create an account and assign a IDnumber to each account(lets say the bank only accepts 100 accounts) and a balance for each account. The employee can also close an …  |
| | Hello, this is my first post on DaniWeb so I hope you'll go easy on me ,and my english.I'm working on a implementation of the AES algorithm in python;my app is supposed to encrypt the contents of files, and it does, yet it is kind of slow.I've optimized the code … |
| | Hello I am student of BSCS 4th Semester. we studied basics of java in OOP subject i want to make a 3D Paint in java simple free hand diagrams by using sphere.. drawing on different coordinates.. [CODE]/** * * @author MuDi */ import com.sun.j3d.utils.geometry.*; import com.sun.j3d.utils.universe.*; import java.util.Scanner; import javax.media.j3d.*; … |
| | Hi Can someone please let me know which classes, objects, etc I should use into to convert an image file (.png, probably) to a printable string in Java? The image will be around 100px square and I presume I could scan 1px lines into arrays, etc? I'm hoping Java has … |
| | I've been scratching my head for quite some time with the following compilation error and I was hoping somebody could shed some light... I have the following in my header (.h) file: [CODE] //the mem_data class======================================// class mem_data : public reader, public date { //multiple inheritance public: mem_data(int,int,std::string); ~mem_data(); private: …  |
| | Hey there, I was wondering if anyone had the time to look over my code and give me some tips or tweaks to help me get it running. The program is all about inheritance, where i have the derived class using the base class clockType (with using strings) to add … |
| | Hello, Im trying to make a simple equation solver with tkinter. Originally i built it without using classes and it worked fine however I am now trying to use a class. [CODE]from tkinter import * import math class RootFinder(Frame): def __init__(self, master=None): Frame.__init__(self, master) self.grid() self.create_widgets() def create_widgets(self): self.root1lbl=Label(self.outputframe, text='') …  |
| | Hi all I think that I should start this by saying that I am fairly new to C++. Currently, I can only write basic OOP programs. However, I have been given a task at work to compile and link some old code that we have (roughly 10 years old) to … |
| | Hey everyone can I get some help please. I read through a few threads with the same problem as me but i can't seem to get the answer i'm looking for. I'm doing a school project and I need to save a Access DataBase that I have created in C#! … |
| | 1. when declare array, what the thing needed. 2. know how to build/use 2D array. 3. how the pointer relate to array. 4. give string manipulation function and describe it. 5. what is the key element for OOP. 6. define structure. 7. how destructor works. 8. define class. |
| | I am reading a Python book for Pyton 2.5 (But I am doing Python 3). I am at the chapter classes and I got this part; "You can check whenever the function attribute was callable." [CODE]callable(tc,'talk',None)[/CODE] In Python3 we do not have callable anymore, so I checked on the internet, … |
| | Dear all I am making a program which adds lots of jlabels to a frame (the idea, eventually, is that each jlabel will link to a different program on my dekstop) The trimmed down code below shows that I have a script which creates an array of multiple jlabels which … |
| | Hello forum. I cant figure out how to overload the '+' operator or maybe theres another error? Im posting from phone so excuse the slopyness. Thanks! [CODE]#include <iostream> #include <string.h> #include <ctype.h> using namespace std; class Ferma { public: static int nr_rate; static int nr_gaini; static int nr_porci; static int … |
| | Write a program that emulates the DOS COPY command. That is, it should copy the contents of a text file (such as any file) to another file. Invoke the program with two CPP command-line arguments—the source file and the destination file—like this: C>ocopy srcfile.cpp destfile.cpp In the program, check that …  |
| | Hey guys I've been asked to create an array of objects on the heap for my assignment but I cant seem to find any examples that explain it well enough on the web. So what I got is: [CODE]//Heabder File class Wheel{ public: Wheel() : pressure(32) { ptrSize = new … |
 | Hiya, I've got a small problem. I have an interface called "event", which represents a networking event. I have classes implementing this interface. Now, when my server app receives a new event, it checks the class of the event and acts accordingly. This works nicely when the implementing classes are … |
| | Hi guys, I am a bit new to OOP in general, and I was just wondering if I am going around what I want to do in the right way. I am making a small game to try to learn OOP and in this game I have several classes for …  |
| | Hello all. I am trying to write a short little game, mainly to boost my knowledge of classes and objects, and of course I am starting to encounter problems. I have several classes for different types of creatures in this game. Most of them take the form of: [CODE] class … |
| | 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 … |
 | Hi, i have some issues with class inheritance and i do not know how to solve it, maybe someone could help me with that ? [CODE] //pentathlete.h #include <iostream> using namespace std; template < class T > class pentathlete { protected : T comp_res [ 5 ] ; /*private: int … |
| | Hi everyone! I'm creating a class for a mortgage payment. I pretty much have most of the code finished but when I compile the code I receive multiple errors saying "Cannot find symbol". This error occurs about 9 times and I am also having some problems with the compareTo method. … |
| | I am supposed to read in data from a file and store it. I know how to read from a file and display it, in main, what i don't understand is how to do that with classes and objects. This is the part im having a little trouble with and … |
| | Im trying to read from a file using classes and objects. i keep getting this error [CODE]main.cpp:16: error: no matching function for call to ‘Game::fillGame()’ Game.h:41: note: candidates are: bool Game::fillGame(std::ifstream&)[/CODE] here is code that goes with the error [CODE] //Game.h bool fillGame(ifstream & din); [/CODE] [CODE] //Game.cpp #include<iostream> #include …  |
| | Hello, I'm a little confused about something.. Is association the same as Interfaces in C#? Thanks :) |
| | [COLOR="Red"][B]//This is the main file[/B][/COLOR] [CODE]#include<iostream> #include<fstream> #include<string> #include "Books.h" #include"account.h" using namespace std; int main() { cout << "\tWelcome\t" <<endl; cout << "1-Login" <<endl; cout << "2-Register" <<endl; cout << "3-exit" <<endl; cout << "Please enter a choice: "; cin >> choice; switch (choice){ case 1: system ("cls"); cout … |
| | I have the following error on line 71 and I'm not sure whats wrong with that statment any explanation would be greatly appreciated. C:\Users\peter\Desktop\CSC 111\welch_lab4\welch_lab4.java:71: cannot find symbol symbol : method equalsIgnorCase(java.lang.String) location: class java.lang.String while (!(response.equalsIgnorCase(FLAG))) ^ 1 error Tool completed with exit code 1 This is the details … |
 | Does anyone feel that Cake is worth the trouble it takes getting used to it? I don't mind putting the time into learning it as long as it pays off in the end. They claim you are up and running faster and spend less time re-inventing the wheel and while … |
 | This works with Python 2.7 [code]class B: def __init__(self, arg): print(arg) class C(B): def __init___(self, arg): super(C, self).__init__(arg) c = C('abc') # abc [/code]Here super() gives a TypeError: must be type, not classobj [code]from math import pi class Circle: """with Python3 object is inherited automagically""" def __init__(self, r): self.r = … |
| | I dont know what the problem...seems the button didnt work at all..~ help me find the problem plss... [CODE]import javax.swing.*; import java.awt.*; import java.awt.event.*; public class listOfMovies extends JFrame implements ActionListener { private JLabel jlbWelcome, jlbPick; private JButton jbtBatman, jbtAngels, jbtDue, jbtFaster, jbtFour, jbtHuman, jbtWarrior, jbtWater, jbtHarry; public listOfMovies () … |
| | I have this error --------------------Configuration: <Default>-------------------- Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException at java.awt.Container.addImpl(Container.java:1041) at java.awt.Container.add(Container.java:959) at javax.swing.JFrame.addImpl(JFrame.java:540) at java.awt.Container.add(Container.java:365) at ticketReservation.<init>(ticketReservation.java:114) at bookAngels.actionPerformed(bookAngels.java:163) at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995) at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318) at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387) at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242) at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236) at java.awt.Component.processMouseEvent(Component.java:6267) at javax.swing.JComponent.processMouseEvent(JComponent.java:3267) at java.awt.Component.processEvent(Component.java:6032) at java.awt.Container.processEvent(Container.java:2041) at java.awt.Component.dispatchEventImpl(Component.java:4630) at java.awt.Container.dispatchEventImpl(Container.java:2099) at java.awt.Component.dispatchEvent(Component.java:4460) at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4577) at …  |
| | Hi I'm trying to create a program that gathers data from some ADC connected and do some averaging on the data. It's build up around classes containing systeminterface and sensors making a datamodel. The program is pretty big, but has worked intil implemention of pthreads I wanted to create a … |
| | Hye guys...im trying to create ScrollBar Horizontal on whole frame, i keep trying and do some research but still fail...Please help me...What should i add. This is the code. [CODE]import javax.swing.*; import java.awt.*; import java.awt.event.*; public class listOfMovies extends JFrame implements ActionListener { private JButton jbtBatman, jbtAngels, jbtFaster, jbtDueDate, jbtHuman, … |
| | I have a question in Inheritance(Python): Write a class named Person with data attributes for a person's name, address, and telephone number. Next write a class named Customer that is a subclass of the person class. The Customer class should have a data attribute for a customer number and a …  |
| | Hi guys, Im pretty dam stuck at the moment on an assignment Im meant to do. Its my last question so everything is pretty laid out, but the question (to me is not useful) so if you could just help me out it'd be much appreciated Ok so what i … |
| | Hi, I have gone over and over the subject and still confused. I currently develop in PHP 5.2.x along with MySQL. (awaiting host to upgrade to 5.3.x, hopefully not to long although on local i develop using php 5.3.5) Currently i use the standard MySQL functions in PHP like: [B]mysql_connect()[/B],[B] … |
| | Hi, I'm new to php oop. In our system when creating a new user, user's role can be assigned by selecting from the role dropdown list. Here, there are two classes, one is user class, another is role class. and user class use role class which is composition relationship. I …  |
| | Hey fellows, I've created a fairly large math suite for my spectrometer research, which is basically a set of programs that does several math operations, generates plots etc... It's beginning to get pretty bulky, and seems like it would benefit from a nice class; wherein, I could store all the … |
| | Hello. I'm currently making a program that deals with a priorityQueue and inheritence/polymorphism. Student -> undergrad -> coop_student or student -> grad Now, the queue takes in the data and just puts it in a linked list and gives it a priority. That way, there are 3 queues and we … |
| | [CODE]class manage { private $entryId; function __construct($entryId) { $this->entryId = $entryId; } function deleteEntry() { //delete $this->entryId from database } } $m = new manage(23); $m->deleteEntry(); [/CODE] how this method delete entry from db deleteEntry(); how sql query works with this please help to understand |
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