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Beginner having a problem with classes


Beginner having a problem with classes

By : Wallace
Date : November 19 2020, 07:01 PM
will help you I'm working through O'Reilly's "Learning Python" and having a problem with classes. I think I understand the concept, but in practice have stumbled upon this problem. Fron page 88-89: , David, you've mis-typed __init__
The correct spelling is this:
code :


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c# beginner problem

c# beginner problem


By : user1903279
Date : March 29 2020, 07:55 AM
like below fixes the issue I am trying to learn C# and I have a problem with the following code:
code :
if(myInt = 10)
if(myInt == 10)
C++ Beginner - Trouble using classes inside of classes

C++ Beginner - Trouble using classes inside of classes


By : Krishna
Date : March 29 2020, 07:55 AM
wish of those help You've got a circular inclusion problem - relatively easy to fix in this case.
Remove the #include "Player.h" from Score.h.
organizing classes - help for an OOP beginner

organizing classes - help for an OOP beginner


By : user3552225
Date : March 29 2020, 07:55 AM
hop of those help? You could google composition over inheritance and is-a vs has-a.
In your design sketch, you mix up a bunch of stuff as you noticed. The easiest example to dissect would be class category{} extends product. One category is not a product, but it has/contains several products. This would be more suitable:
code :
class product {
        public $title; // for simplicity
        public $price; // for simplicity
}
class category {
        private $name;
        private $products;
        public function __construct($name) {
                $this->name = $name;
                $this->products = array();
        }   
        public function addProduct(product $p) {
                $this->products[] = $p; 
        }   
        public function printProducts() {
                $product_names = array_map(function($product) {
                        return $product->title;
                }, $this->products);
                echo implode(', ', $product_names);
        }   
}

$c = new category('fruits');
$apple = new product;
$apple->title = 'apple';
$orange = new product;
$orange->title = 'orange';
$banana = new product;
$banana->title = 'banana';

$c->addProduct($apple);
$c->addProduct($orange);
$c->addProduct($banana);

$c->printProducts();
class category_factory {
  public function __construct(PDO $pdo) { $this->pdo = $pdo; }
  public function getCategories() {
    $rows = $this->pdo->query("SELECT * FROM categories")->fetchAll();
    $categories = array();
    foreach($rows as $row) {
      $categories[] = new category($row['name']);
    }
    return $categories;
  }
}
classes in Python for a beginner

classes in Python for a beginner


By : DasLampe
Date : March 29 2020, 07:55 AM
it fixes the issue Could you please help me to find the problem? Python code that works:
code :
def __init__(self, parent, b):
    self = wx.Frame(parent = parent, id=-1, title="Parameters")
    self.a = b
class ParamWindow(wx.Frame):
    def __init__(self, parent, b):
        # Initialize the superclass (wx.Frame).
        super(ParamWindow, self).__init__(parent=parent, id=-1, title="Parameters")
        self.a = b
        print self.a
Using classes in Java (beginner)

Using classes in Java (beginner)


By : Leandro Eiró
Date : March 29 2020, 07:55 AM
I wish did fix the issue. I am currently trying to create a class that prints out a rectangle with a height and width 1. I have the program set up (there is a template we are supposed to use) and I incorporated all of the steps. However there is one problem with the return statement on the line "SimpleRectangle(){" it says it is missing a return statement but no matter what I return it still comes up with an error. , This looks like a constructor for a class called SimpleRectange
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