Programming Language Data Types Explained
Introduction to Data Types
A data type defines a collection of values and operations on those values. A descriptor is a set of attributes of a variable. An object is an instance of an abstract data type (user-defined or built-in). A key design issue for all data types is: What operations are provided for variables, and how are they specified?
Primitive Data Types Explained
- Primitive types are not defined in terms of other types.
- They often mirror hardware data types for performance and compatibility.
PHP OOP Essentials: Classes, Objects, and Core Concepts
PHP Object Basics
Defining and Using Instances
- Define Instance
$student1 = new Student;- Set Value to Property
$student1->firstName = "ex";- Calling Object Function
$student1->getName();- Refer to the Instance (inside the class)
$this->name;
Visibility Modifiers
- public
- Accessed from anywhere. Example:
public $property_name;(orvar $property_name;for older PHP versions) - protected
- Accessed only from this class and its subclasses. Example:
protected $property_name; - private
- Accessed from inside the class only.
Data Structure Fundamentals
Array Implementation of List
An array implementation of a list involves using a contiguous block of memory to store elements, allowing for efficient access and manipulation. Here’s a breakdown of the key aspects of this implementation:
Structure
- An array is a fixed-size data structure that holds elements of the same type. In the context of a list, an array can be used to store the list elements in sequential memory locations.
- The size of the array is typically defined at the time of creation, which
Introduction to Digital Technologies and Concepts
Desktop Publishing (DTP)
DTP refers to the use of computers to design and publish books, brochures, and other documents. It is a combination of several different processes including word processing, graphic design, information design, etc.
Page layout program is used to import text created in a word processing program, charts and graphs from a spreadsheet program, and drawings and illustrations created in CAD.
Font (high-quality scalable) gives you control over typographic features such as Kerning
Read MoreModel-View-Controller (MVC) Pattern Explained
Understanding the MVC Pattern
Model-View-Controller (MVC) is a software architectural style that separates application data, user interface (UI), and control logic into three distinct components. The MVC pattern is frequently used in web applications, where the View is often the HTML page and associated code rendering dynamic data, the Model encompasses the data management system (like a database) and business logic, and the Controller handles user input events received from the View.
Component Descriptions
Model
This
Read MoreDatabase Fundamentals and Access Basics
Database Components
What Are Databases Made Of?
- Fields and records
What Is a Table?
Tables are the most basic object of a database; they store data in categories.
What Is a Field?
The basic unit of a database. The names of fields cannot start with a space or special characters. They cannot include periods, exclamation marks, or brackets. However, they may contain spaces in the middle. The field description allows you to clarify the information contained in the field name. The field type allows you to
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