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Northern IrelandSoftware Systems Development

AS 2 Event Driven Programming

5 dot points across 5 inquiry questions. Click any dot point for a focused answer with worked past exam questions where available.

How are arrays, lists and records used to hold an application's data, and how are linear and binary search and a simple sort carried out?

Storing application data in arrays, lists and records, and the standard algorithms - linear search, binary search and a simple sort such as bubble sort.
A CCEA A-Level Software Systems Development answer on storing application data in arrays, lists and records, and the standard algorithms: linear search, binary search and a simple sort such as bubble sort, with their requirements and trade-offs.
13 min answer →

What is event driven programming, and how do events, event handlers and the event loop drive an application?

The event driven paradigm - events, event handlers, the event loop, event-driven versus procedural programming, and the roles of the operating system and the program.
A CCEA A-Level Software Systems Development answer on the event driven paradigm: what events and event handlers are, how the event loop dispatches them, and how event-driven programming differs from procedural programming.
12 min answer →

How does an application read from and write to text files so that data persists between runs?

Reading from and writing to text and sequential files - opening, reading, writing, appending and closing files, processing records, and handling file errors.
A CCEA A-Level Software Systems Development answer on file handling: opening, reading, writing, appending and closing text and sequential files so data persists between runs, processing records line by line, and handling file errors.
12 min answer →

How are forms and GUI controls used to build a usable interface, and what HCI principles guide good design?

Forms and common GUI controls, their properties, events and methods, wiring controls to handlers, and the human-computer interaction principles of good interface design.
A CCEA A-Level Software Systems Development answer on forms and GUI controls: common controls and their properties, events and methods, wiring controls to handlers, and the human-computer interaction principles behind good interface design.
12 min answer →

How is an event driven application tested and debugged, and how does exception handling stop run-time errors from crashing it?

Testing strategies for applications, debugging tools (breakpoints, stepping, watches), exception handling with try and catch, and producing robust software.
A CCEA A-Level Software Systems Development answer on testing and debugging event driven applications: test strategies, debugging tools such as breakpoints, stepping and watches, and exception handling with try and catch for robust software.
12 min answer →