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Questions and Answers
What is a key characteristic of a module in programming?
Which statement accurately describes procedures in programming?
What best describes the purpose of programming libraries?
Which of the following is an advantage of event-driven programming?
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Which programming language is commonly associated with event-driven programming?
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What determines the flow of execution in event-driven programming?
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Which best describes what an event handler does?
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What is a primary feature of event-driven programming?
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How do trigger functions function in event-driven programming?
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In what type of applications is event-driven programming most commonly applied?
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What does the term 'blocking' refer to in the context of event-driven programming?
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What is an example of a time-driven event in event-driven programming?
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Which of the following defines 'service-oriented' in the context of event-driven programming?
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What triggers events within a program?
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Which of the following correctly describes a local variable?
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How does Java handle global variables in comparison to other programming languages?
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Which parameter passing method creates a duplicate copy of the variable?
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What is the function of predefined functions in programming languages like C#?
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Which of the following refers to the accessibility of global variables?
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Which parameter passing method allows for variable changes made in a function to affect the original variable?
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What is the most significant downside of using global variables?
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What keyword is required to identify parameters passed by reference?
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Which statement correctly describes the output parameters?
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What is a defining characteristic of the 'params' keyword?
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How are reference parameters initialized compared to output parameters?
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What allows for modularity in a program?
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What does the 'ref' keyword facilitate in terms of parameter passing?
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Why might modularity increase development time?
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Which of the following is true about 'params' parameters?
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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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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.
