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36b863 lisa 2026-08-12 09:10:36
Add C07 study pages; regenerate C06 via the shared port script sd/C07: home + Naming Conventions, Internal Documentation, Validation Techniques (21 skill codes), linked from the SD hub. sd/C06 pages regenerated by sat/port-reference-godot-to-wiki.py (marker update; C06-home now generated from the repo README like every other page). Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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<!-- Generated from applied-computing-au vic/unit3-4/sat/C06-2026/C06-Reference-Godot by port-reference-godot-to-wiki.py — do not hand-edit; re-run the port. -->
3aab9f lisa 2026-08-11 23:24:06
Add C06 skill-code study pages, linked from the SD hub Eleven pages ported from the applied-computing-au C06-Reference-Godot standard: home page with the 34-code lookup, per-topic pages with labelled GDScript examples, evidence standards, and Check Your Understanding fold blocks. Generated mirror — repo copy is canonical. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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# Instructions and Operators — GDScript
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**Skill codes on this page**
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| Code | Level | Skill |
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|---|---|---|
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| C611 | 1–2 | instructions |
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| C612 | 1–2 | arithmetic operators |
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| C623 | 3–4 | logical operators |
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| C624 | 3–4 | conditional operators |
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## C611 — Instructions
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**Definition.** A unit of code that can be executed by a compiler or interpreter.
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Label a short piece of code that *does something*: takes input, calculates, produces output.
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```gdscript
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trips_today += 1 # C611 — instruction: updates the trip counter
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```
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From a studied project:
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```gdscript
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# connect-go-dots — grid.gd
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Shared.photo = photo # C611 — instruction: stores the chosen photo
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```
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**Earns the tick:** any labelled statement that executes and has an effect. This is the floor of the ladder — every student should have it.
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## C612 — Arithmetic operators
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**Definition.** A symbol that performs basic mathematical operations such as addition, subtraction, multiplication and division.
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GDScript: `+` `-` `*` `/` `%` (remainder) and `**` (power).
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```gdscript
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# C612 — arithmetic operators
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var total: float = fare * trips + 0.50 # * multiply, + add
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var change: float = payment - total # - subtract
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var per_trip: float = total / trips # / divide
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var minutes_left: int = seconds % 60 # % remainder
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```
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**In tile-matching-game** (`game.gd`) — working out the board:
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```gdscript
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# tile-matching-game — game.gd
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var total_cards := rows * columns # C612 — * multiply
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if total_cards % 2 != 0: # C612 — % remainder: an odd board cannot hold pairs
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return
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pairs_to_find = total_cards / 2 # C612 — / divide (int ÷ int stays int)
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```
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**Watch:** integer division truncates — `7 / 2` is `3`, but `7.0 / 2` is `3.5`. Being able to say why is C629 territory.
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## C623 — Logical operators
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**Definition.** A Boolean operator used to combine expressions, such as AND, OR.
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GDScript uses the words `and`, `or`, `not` (the symbols `&&`, `||`, `!` also work — prefer the words).
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```gdscript
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# C623 — logical operators
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if is_concession and zone <= 2: # and: both must be true
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fare *= 0.5
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if not card_registered or balance < 0.0: # not, or
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show_warning()
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```
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**In tile-matching-game** (`game.gd`):
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```gdscript
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# tile-matching-game — game.gd
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if is_busy or card.is_face_up or card.is_matched: # C623 — or: any reason to ignore the click
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return
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if pairs_to_find > 0 and score >= pairs_to_find: # C623 — and: both needed to win
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message_label.text = "All pairs found in %d turns!" % turns
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```
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**Earns the tick:** a condition that *combines* expressions. A bare `if balance >= fare:` is C624 only — no logical operator in sight.
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## C624 — Conditional operators
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**Definition.** A symbol used to compare two values within a condition: equals `==`, not equals `!=`, greater than `>`, less than `<`, greater than or equal `>=`, less than or equal `<=`. Used inside selection and iteration conditions to decide whether a branch runs or a loop continues.
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```gdscript
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# C624 — conditional operators
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if balance >= fare: # >= at least enough money
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touch_on()
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elif balance == 0.0: # == exactly empty
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show_topup_prompt()
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```
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**In tile-matching-game** (`game.gd`) — the heart of the game is one comparison:
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```gdscript
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# tile-matching-game — game.gd
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if first_card.pair_id == second_card.pair_id: # C624 — ==: the cards match
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_handle_match()
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```
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**Not to be confused with** the ternary conditional *expression* (`0.5 if is_concession else 1.0` in GDScript) — that is shorthand for selection, not a comparison.
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**Watch:** `=` assigns, `==` compares. GDScript will refuse `if balance = 0.0:` — read the error, don't fight it.
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## Check Your Understanding
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1. In `if balance >= fare and is_concession:` — which two operator codes could you label, and on which symbols?
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>| ### Answer
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>| C624 on `>=` (conditional operator), C623 on `and` (logical operator).
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2. Why will `if balance = 0.0:` not run?
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>| ### Answer
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>| `=` assigns; comparing needs `==`. Godot reports a parse error.
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3. In `total_cards % 2 != 0` — what does `%` do, and which code is it?
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>| ### Answer
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>| `%` gives the remainder after division — C612 (arithmetic). The `!=` beside it is C624.