Mainline

Term

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Definition

The main algorithm that controls the program by calling subroutines in order. Good mainlines are clear and uncluttered.

Example: Put calls to your subroutines in the mainline, and call functions after they are defined (2025 Q19 marker note).

Found in: syllabus, course specifications, school notes.

Where you'll use it in the test

Syllabus area: Y11 Programming Fundamentals.

Question types it can appear in

Pseudocode: Write mainline then subroutines (exam process)
Python: Write or complete it in the online Python tool.
Multiple choice: Pick the option that matches the definition or example.

Where it has appeared in the paper

Secure Software Architecture (Part A); The Software Engineering Project (Part B). Part letters follow each paper’s own layout.

How to use it

A model sentence

General advice, built from the definition and example above

“The main algorithm that controls the program by calling subroutines in order.” Then apply it: Put calls to your subroutines in the mainline, and call functions after they are defined (2025 Q19 marker note).

In a short answer, give the definition in your own words first, then tie it to the situation in the question. Do not copy the example above unless it fits the scenario.

Official worked answer

2025 HSC Q19 (3 marks): Developing secure code (Python) (3 marks): official criteria and sample answer

Criteria

3: Correct code for the problem. 2: Partially correct code that includes a correct selection structure OR password creation. 1: Some understanding of the scenario and Python.

Sample answer

uName = input('What is your username?') password = input('What is your password?') passwordP1 = uName[:3] passwordP1= passwordP1 + '123' if passwordP1 == password: print ('Welcome!') else: print ('Incorrect password entered')

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Go deeper

Flashcard: Mainline in Programming Fundamentals (Year 11) · study that set
Memorise: Software development steps and algorithm design
Notes: Pseudocode rules (Pseudocode, flowcharts and diagram rules)
Notes: Modelling tools: DFD, structure charts, storyboards, flowcharts, class diagrams (The Software Engineering Project (Year 12))
Notes: Maintenance, version control, stubs and drivers, optimisation (The Software Engineering Project (Year 12))
Notes: Object-oriented concepts (Year 11 content (Programming fundamentals, OOP, Mechatronics))
Full term page: every question, note and marking comment for Mainline

Check yourself

Explain “Mainline” in one sentence, give an example, and name a question type that could test it.

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