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Chapter 15: Problem 4

What is an event-driven program?

Short Answer

Expert verified
Answer: The main components of an event-driven program include the event source, which generates events like user input or system events; event listener, a part of the code that listens for specific events; and event handler, the code executed in response to a particular event. The main characteristics are the event loop, which constantly listens for new events, asynchrony, enabling events to be handled at any time, and reusability, providing greater code sharing across events. Advantages include improved user experience due to real-time feedback, resource efficiency as the program executes only necessary code, and easy integration with other systems, such as databases and user interfaces.

Step by step solution

01

Introduction- Event-driven programming

Event-driven programming is a programming paradigm where the execution flow of a program is determined by external events, such as user actions (e.g., mouse clicks, keyboard press), sensor outputs, or messages from other programs or threads.
02

Components of an Event-driven program

An event-driven program typically consists of three components: 1. Event Source: Generates the events, such as user input or system events. 2. Event Listener: A portion of the code that listens for specific events and reacts to them. 3. Event Handler: The code executed in response to a particular event.
03

Characteristics of an Event-driven program

The main characteristics of an event-driven program are: 1. Event loop: The program runs a loop that constantly listens for new events and dispatches them to the appropriate event handlers. 2. Asynchrony: Events can occur at any time, and the program must be able to handle them asynchronously. 3. Reusability: Event-driven programming allows for greater code reusability, as event handlers can be used for multiple events.
04

Advantages of Event-driven programming

The advantages of event-driven programming include: 1. Improved user experience: Event-driven programs can quickly respond to user actions and provide real-time feedback. 2. Resource efficiency: Event-driven programs can automatically manage resources, as the program only executes the necessary code when an event happens. 3. Easy to integrate: Event-driven programs can easily integrate with other systems, like databases, APIs, and user interfaces.

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Most popular questions from this chapter

Look at the following pseudocode and then answer the questions that follow it: Module showValuesButton_Click() statement statement etc. End Module a. What event does this module respond to? b. What is the name of the component that generates the event?

What is a user interface flow diagram?

Why must components be assigned names?

What is an event handler?

When the user runs a program in a text-based environment, such as the command line, what determines the order in which things happen?
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