Event Driven Programming Principles
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Questions and Answers

What is a key characteristic of a module in programming?

  • A module should contain all code for a program.
  • A module must remain fully visible to all components.
  • A module requires no dependencies.
  • A module may encapsulate its components for secrecy. (correct)

    • Which statement accurately describes procedures in programming?

  • Procedures can only carry out one task at a time.
  • Procedures are not reusable and must be rewritten each time.
  • Procedures help to avoid code repetition by encapsulating tasks. (correct)
  • Procedures can only execute in a sequential manner.

    • What best describes the purpose of programming libraries?

  • They consist of pre-compiled routines and templates for use. (correct)
  • They serve only as documentation for coding languages.
  • They restrict the range of programming languages available.
  • They are solely for debugging code during development.

    • Which of the following is an advantage of event-driven programming?

    <p>It simplifies the user interface design process.</p> Signup and view all the answers

    Which programming language is commonly associated with event-driven programming?

    <p>Java</p> Signup and view all the answers

    What determines the flow of execution in event-driven programming?

    <p>User inputs and system-generated events</p> Signup and view all the answers

    Which best describes what an event handler does?

    <p>It executes code in response to an event being triggered.</p> Signup and view all the answers

    What is a primary feature of event-driven programming?

    <p>Constant polling for new events</p> Signup and view all the answers

    How do trigger functions function in event-driven programming?

    <p>They define which type of event handlers will run for which event.</p> Signup and view all the answers

    In what type of applications is event-driven programming most commonly applied?

    <p>Graphical user interfaces and web applications</p> Signup and view all the answers

    What does the term 'blocking' refer to in the context of event-driven programming?

    <p>The inability to access event handlers until a certain condition is met</p> Signup and view all the answers

    What is an example of a time-driven event in event-driven programming?

    <p>Code executing at specific intervals, like weekly uploads</p> Signup and view all the answers

    Which of the following defines 'service-oriented' in the context of event-driven programming?

    <p>Writing programs specifically designed for automated services</p> Signup and view all the answers

    What triggers events within a program?

    <p>User interaction with objects</p> Signup and view all the answers

    Which of the following correctly describes a local variable?

    <p>Declared within a method and limited to that method's scope</p> Signup and view all the answers

    How does Java handle global variables in comparison to other programming languages?

    <p>It does not utilize global variables to maintain control and manageability</p> Signup and view all the answers

    Which parameter passing method creates a duplicate copy of the variable?

    <p>Value</p> Signup and view all the answers

    What is the function of predefined functions in programming languages like C#?

    <p>To simplify coding by providing built-in methods and functionalities</p> Signup and view all the answers

    Which of the following refers to the accessibility of global variables?

    <p>Accessible from any method or class within the namespace</p> Signup and view all the answers

    Which parameter passing method allows for variable changes made in a function to affect the original variable?

    <p>Ref</p> Signup and view all the answers

    What is the most significant downside of using global variables?

    <p>They complicate variable management and control</p> Signup and view all the answers

    What keyword is required to identify parameters passed by reference?

    <p>ref</p> Signup and view all the answers

    Which statement correctly describes the output parameters?

    <p>They are unidirectional; no value is supplied initially.</p> Signup and view all the answers

    What is a defining characteristic of the 'params' keyword?

    <p>Must precede other parameters in a method declaration.</p> Signup and view all the answers

    How are reference parameters initialized compared to output parameters?

    <p>Only reference parameters must be initialized.</p> Signup and view all the answers

    What allows for modularity in a program?

    <p>Modules are spread out into distinct parts.</p> Signup and view all the answers

    What does the 'ref' keyword facilitate in terms of parameter passing?

    <p>Bidirectional communication.</p> Signup and view all the answers

    Why might modularity increase development time?

    <p>It requires separate testing for each module.</p> Signup and view all the answers

    Which of the following is true about 'params' parameters?

    <p>They must be of the same data type.</p> Signup and view all the answers

    Study Notes

    Event Driven Programming

    • Event-driven programming is a programming paradigm where the flow of execution is governed by events, like user interactions or system-generated events.
    • Events are handled by event handlers or event callbacks, which are functions designed to respond to specific events.
    • This paradigm is prevalent in modern software engineering, particularly in graphical user interfaces (GUIs) and applications that react to user input.
    • Event-driven programming relies on events as the foundation for software development.

    Principles of Event-Driven Programming

    • Event handlers: Functions that handle events; these can be blocking (halt execution until the event is processed) or non-blocking (continue execution while handling the event).
    • Event binding: A mechanism connecting registered event handlers to specific events.
    • Main loop: Continuously polls for new events and calls the appropriate event handler(s) when a registered event is received.

    Features of Event-Driven Programs

    • Service-oriented: Programs designed to provide services.
    • Time-driven: Code that executes based on a time trigger (e.g., running weekly or upon program launch).
    • Event handlers: Functions triggered upon the occurrence of a specific event.
    • Trigger functions: Determine the code that runs when a specific event occurs, selecting the appropriate event handlers for the event.

    Events and Triggers

    • Events are triggered by user interactions with objects, such as clicking a button or typing on the keyboard, or by system events.
    • Events can involve mouse actions (clicks, movement, scrolling), keyboard inputs, or user interface elements.

    Pre-defined Functions, Variables, and Parameter Passing

    • Pre-defined Functions: Functions built into the programming language (e.g., Main() in C#) provide basic functionalities.
    • Local Variables: Variables declared within a method, accessible only within that method.
    • Global Variables: Variables accessible from any part of the program.
    • Parameter Passing: Allows values to be passed to functions, enabling various tasks, including setting alarms or finding specific characters.
    • Four parameter passing methods in C#:
      • Value: Creates a duplicate copy of the variable, so changes in the called function do not impact the original variable.
      • Ref (reference): Passes the address of the variable, allowing changes in the called function to affect the original variable.
      • Out (reference): Similar to ref, but the variable doesn't need to be initialized before being passed.
      • Params (parameter arrays): Used for passing a variable number of arguments as an array to a function.

    Modularity

    • Modularity: Breaking down a program into independent modules, each responsible for specific tasks. This simplifies program development and maintenance.
    • Modules: Units of code with:
      • Interfaces: Define the module's public components.
      • Encapsulation: Hide internal implementation details.
    • Modules depend on interfaces, promoting independence and maintainability.

    Procedures and Programming Libraries

    • Procedures: Small programs (sub-programs) used to avoid code repetition and carry out specific tasks.
    • Programming Libraries: Collections of pre-compiled routines, data files, scripts, templates, and other resources. These libraries simplify development by providing reusable components.

    Advantages of Event-driven Programming

    • Ease of programming and development: Event-driven programming is often more intuitive and visually driven, making it easier to develop user interfaces.

    Examples of Event-driven Programming Languages

    • Visual Basic
    • Java
    • C#

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    Related Documents

    M1_Lesson-2.pdf

    Description

    This quiz covers the fundamentals of event-driven programming, a key paradigm in modern software development. Participants will explore concepts such as event handlers, event binding, and the main loop mechanism that drives responsive applications. Test your understanding of how events govern software execution and user interactions.

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