1,089 Topics
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| | I am having a problem to understand how class inhertance works in Java.. Now I want to get information from a class to another and let's say we have class A and class B class A contains a string an int and a byte class B contains a String and …  |
 | We cannot use constructors if we want that whenever a pointer is declared, it should be NULL. Am I right Sir? if I declare student *head, *tail, where student is a class, can I make my pointers automatically make NULL using default constructor?  |
| | it have 3 classes. main class = run every thing player class = create player and create his moves level class = render map and player when i run this code below it render a map and two players. 1st player in redering in main when can move. if user … |
 | Hey guys it's been a long time i've wrote here. I decided to take a course in JS OOP, my problem is the program doesn't do the difference between objects. Exemple the program work only if i pop 1 object, if i pop a second one, it screws my functions. … |
| | For example let's say we have the property called Customer that returns a value of name String name; <== Global Variable public String getName() { return name; } public String setName(holdingName) { name=holdingName; } and a constructor called Match public FullName(String realName) { holdingName = realName; } Can I do … |
| | So I am working on a program and it has two seperate classes.. One of them contain the forum layout and the other contain some calculations and totals.. The problem is that the class with the calculations contain a constructor and other functions that I need to pass from this …  |
 | Hi all! I just have a quick question about the execution of a copy constructor. This is the code i'm testing my work with as I'm busy learning for a test. Class file: Clock :: Clock (int h, int m, int s) { hr = h; min = m; sec … |
| | Hi can someone guide me how to write these code in oop? <script type="text/javascript"> return answer; var rslt=0; var answer= ""; var a,b,c; var fill = new Array(50); function Random(min,max) {return Math.floor(Math.random() * (max - min + 1)) + min;} function myTwoDArray(){ var string=""; var myArray= new Array (20); var … |
| | Hi people, I would like to learn how to create database applications which store the data entered by multiple users, process the data, and provide the data as requested by the user. Is it possible to write such an application by using Microsoft SQL Server and Microsoft Visual C#? I'm … |
 | Upon aiding a friend - I have decided to post the example used here. The following is a snippet that shows basic class inheritance. The source file as well as a test case can be found attached. You can test these classes with the following code: Dim cNew As New … |
 | Hi! I am supposed to write a programm for making a window.First of all, I must make a window with some given default values. Below is the code that I have been given as a template public class Window { private String name; private int height; private int width; private … |
| | I have 2 classes. AddressBook and SingleAddress. AddressBook is supposed to contain SingleAddress. I'm omitting the #include and some of the extra functions. Here's SingleAddress.h class SingleAddress { private: string lastName,firstName,strAdd,city,country,email; int postCode,homeNum,mobileNum; public: SingleAddress( string s1,string s2,string s3, string s4,string s5,string s6, int i1,int i2,int i3); string toString(); }; …  |
| | Please bear with me, this is my first post So, I have this superclass called A. And I've 2 subclasses A1 and A2. A has attribute name. A has function toString(). A1 inherits name, and has attribute hair. A1 has a method toString() which goes: string A1::toString(){ string stringA= A::toString(); …  |
| | I have this weird problem. If my constructor is [header] class Book { private: vector<string>Entry; public: Book(); [cpp] Book::Book(){ Entry.push_back("0"); Entry.push_back("1"); Entry.push_back("2"); The weird thing is that it does not update when I do more .push_back. I use: void Book::addItem(vector<string>newItem) { for(int f=0; f<Entry.size(); f++) { Entry.push_back(newItem[f]); cout<<Entry[f]; } } …  |
 | Hello all, I have not tested the code I'm posting here to see if it compiles, but I have an issue in a large codebase and I believe that this should be the simplest program to demonstrate the issue; class base { public: shared_ptr<base> clone()=0; }; typedef shared_ptr<base> baseptr; class … |
| | Hi everyone! So I have this code to modify. I need to write a code inside the **int main** field, that would cause 37 launches of the constructor called M_48(). I have no idea how to solve this. Any ideas?  |
| | Hi! I have a super class called character, subclass player. when i compile, i get this error: constructor Room in class Room cannot be applied to given types; from this bit of code in Character: public Character(Room room, String name) this.name=name; currentRoom = room; Room currentRoom = new Room(); // … |
| | i'd like to change my code from procedural to OOP and i've got a problem when it comes to naming methods. can somebody explain to me what's wrong with this - sort.java:36: ';' expected public static int sortAscending () { - i understand that semicolon is not needed sort.java:36: illegal …  |
| | So this is basically what's supposed to be the outcome of my code: > 69:hw/05/src> javac WordOccurrenceCounter.java 70:hw/05/src> java WordOccurrenceCounter Reading the book... Getting counts from a TreeMap... Enter a string ('q' to quit): wealth wealth occurred 7 times. Enter a string ('q' to quit): poverty poverty occurred 10 times. … |
| | Hey, I'm developing a program in which there are two classes. The purpose of one of them is to create vectors that change dinamically (class A) and the other is a bunch of methods to operate on these vectors (class B). The question is: I don't see any need to … |
| | The human body has many organs (heart, lungs, brain, and kidney, to name a few). We could think of the human body as complex object made up of simpler objects (organ). a) Create classes for heart and brain. Think about what the functions of the heart and brain are in …  |
| | Hello, I am working on a homework problem that has to do with inheritance, I thought that as long as the class interface and implementation files for the base classes the derived would work with the include statement: #include "salariedemployee.h" and the line class administrator : public salaried employee. I … |
| | I'm newbie in C++ programming and I want to declare a constructor from following code in my main however I'm completely confused about it. Here is the code: #include <vector> using namespace std; template <typename HashedObj> class HashTable { public: explicit HashTable( const HashedObj & notFound, int size = 101 … |
| | package hospitalclient; public class Person { static int idnumber= 1500; private String name; private String telephoneno; private char gender; private String nationality; //No Parameter constructor public Person() { name="unassigned"; telephoneno = ""; gender = 'M'; nationality = "Saudi"; } public int getid() { return idnumber; } // Accessor Methods public …  |
 | **Hi Team Daniweb,** Explain perlOOP concepts (basics and a bit advanced) with simple examples to understand what is OOP and how can we use this concepts in PERL. **Thanks!** Anil A Kumar |
| | I'm sort of a begginer in classes. I must implement a simple problem: chosing a phone. I thought that I should make a program in which a user can select some conditions, like must have wifi or not, android or other, etc. and return a list with the phones that … |
| | i Always getting : **mysql_fetch_array(): supplied argument is not a valid MySQL result resource in C:\wamp\www\class\function.php on line 28** please give the suggestion friends config.php <?php define('DB_SERVER', 'localhost'); define('DB_USERNAME', 'root'); define('DB_PASSWORD', '12345'); define('DB_DATABASE', 'class'); class db_class { function db_constractor() { $connection = mysql_connect(DB_SERVER, DB_USERNAME, DB_PASSWORD) or die('Oops connection error -> … |
 | I knew that I can use variable variables instead of reflection in PHP but I have never gone that way because my OOP background stated that this is not a clean way. Recently I made a test using both methods and the results made me rethink it. Using variable variables … |
| | Hello, I am taking my first basic computer programming course. We are learning how to use C# in Visual Studio. Recently we started learning about classes and how they work in OOP. I get the idea of what they are and what they do. I am having a problem writing …  |
| | I have to write a program that accepts data for a class and then ouputs it in the main. so far i have this. #include<iostream> #include<string> #include<fstream> using namespace std; ifstream infile; class animal { string species; string family; string phylum; string desc; static int count; public: bool readIN(const string …  |
| | Hi all, A problem asks me to create a point class,line class composing two points, a triangle class composing three lines.Also a right angle triangle and an equilateral triangle class both inherit triangle class.I did this. public class Point{ private int x; private int y; public Point(int x,int y){ //error … |
| | can anyone help me? i got problem count the monthly installment. //class class vehicle { public: char model[20], color[20], brand[20]; float price, deposit, rate, monthly_installment, newprice; int term; public: void calculate_installment(); }; class car:public vehicle { private: float installment, newprice; public: void calculate_installment(); }; //main program #include <iostream> #include <string.h> …  |
| | I think I can learn a lot from any answer to the two questions in this post. OK, I’ve got a large object. That object has attributes and does things. Those attributes also do things. MOST of what they do is sit there like a list, int, or np.array and … |
| | I'm using a "simple" script that I downloaded for an image galery, since it was a free script there is no support and although the script works great I need a simple modification so people can edit the information they provided with the picture they uploaded. I manage to add … |
| | Hello, I am working on a project and I am completely stuck. I basically need to read in text data from a file that is formatted like so: 4 numbers per line separated by a comma (there is no hard set of how many rows, this program should be able …  |
| | /*I'm having trouble creating a constructor for degree and *coeffs as well as properly creating the dynamic arrays for the coefficients of the 2 polynomials a and b. I'm just concerned about getting the correct values. My textbook only gives us eamples of constructos for eamples not well related to … |
| | **Write a single Program in Java that illustrates the use of following Object Oriented Programming (OOP) features Classes Objects Inheritance Methods State** |
 | Hello!!! mmm am learning OOP in Java ... and now I'm facing a prob in reading/writing .txt file here's my code: import java.util.Scanner; import java.util.Formatter; import java.io.File; import java.io.FileNotFoundException; public class Tester { public static void main(String[] args) { Scanner scan = null; Formatter formatter = null; File fileI; File … |
| | Hi so I have a practice lab I am working on where I am asked to fill in the code. The program is supposed to take in two 3D points (x,y,z) and compute the distance between them. I have almosty all of the program finished im just stuck on how …  |
| | Hi, I'm having issue with understanding how this array works in `OOP`. I want to sort this from `ABC` or by `123`. I'm reading about it but I don't know how to run this code. I created the array but making it work is something new to me. //This is … |
| | I'm in the basics of learning to code in OOP. So far I've tried simple input/output and succeeded but am now trying to move onto something still rather basic but a step up from previous attempts. Anyway, I'm writing a login script connecting to a PDO database. I've tested all … |
| | Hello all, I have been searching for some time to find the most appropriate enviroment to draw lines and simple tri's / quads in three dimensional space. I have recently experiemented with the floatcanvas class in wxpython and I really like it for 2D work, but extending it into the … |
| | I'm working on a website: http://tinyurl.com/9sdq3eo (I've used tinyurl as I don't want you to think I'm promoting, the website isn't even finished yet. Free2Read.co.uk for those not wanting to view on tinyurl Anyway I'm trying to learn OOP with PHP before I delve into frameworks but I'm having excruciating …  |
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| | hi all, In the book "Programming Languages-Pragmatics" second edition by Michael l. Scott and Morgan Kaufmann, there is a sentence while explaining about copy constructor: "In recognition of this intent, a single-argument constructor in C++ is called a copy constructor." This is about the constructor of the form foo::foo(const foo& …  |
| | Hi all, I came to know that in Java or c++, constructor is executed only after the allocation of space.... Then what does an implicit default constructor(in c++) or default constructor in Java does....? If we explicitly define our constructor then the initialization will be done according to our needs! … |
| | Hey there, Just hit a road block in my assignment. I won't concern you too much with the assignment itself but it's basically a number input operated menu with option's like "Display employee details" & "Input pay details." I'm up to a part where I need to get the section … |
| | <? super Animal> means animal or it's superclass only. Then why inside the method it's allowing to add Dog object even though it's a subclass of Animal? This program compiles and runs! import java.util.*; class Cat {} class Animal{Animal() {System.out.println("Animal constructor");}} class Dog extends Animal{Dog() {System.out.println("Dog constructor");}} public class GenericDemo5 … |
| | Ok So I have two classes that share the same instance variables, the variables have been declared in 'Dog', however I cannot seem to get the instances to work within my other class 'DogChorus'. Therefore what must I do to get the instances to work within 'DogChorus' constructors? The variables … |
| | hi how do i create a contaer class for a processors in C#? |
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