ProgrammingTopic Summary
Knowledge Organiser: Operators
Part of Operators · GCSE GCSE Computer Science revision
This topic summary covers Knowledge Organiser: Operators within Operators for GCSE Computer Science. Revise Operators in Programming for GCSE Computer Science with 15 exam-style questions and 8 flashcards. This topic appears less often, but it can still be a useful differentiator on mixed-topic papers. It is section 7 of 7 in this topic. Use this topic summary to connect the idea to the wider topic before moving on to questions and flashcards.
Topic position
Section 7 of 7
Practice
15 questions
Recall
8 flashcards
Knowledge Organiser: Operators
Key Terms
- Arithmetic operator: Performs a mathematical calculation (+, -, *, /, DIV, MOD)
- Comparison operator: Compares two values and returns true or false (==, !=, <, >, <=, >=)
- Logical operator: Combines boolean conditions (AND, OR, NOT)
- DIV: Integer division — divides and discards the remainder (e.g. 17 DIV 5 = 3)
- MOD: Modulus — returns only the remainder (e.g. 17 MOD 5 = 2)
Must-Know Facts
- / gives a real result; DIV gives an integer result (no remainder)
- MOD is used to check if a number is even:
number MOD 2 == 0 - Use == for comparison; = is for assignment
- AND: both conditions must be true; OR: at least one must be true; NOT: inverts the value
- 5 DIV 2 = 2 and 5 MOD 2 = 1 (together they give the full division result)
Key Concepts
- Check even/odd:
if number MOD 2 == 0 then(even) - Get last digit of a number:
number MOD 10 - Cycle through 0–9:
counter MOD 10 - Combine conditions:
if age >= 18 AND hasID == true then
Common Mistakes
- Confusing DIV and MOD: DIV gives the whole number part of a division (quotient); MOD gives the remainder — 17 DIV 5 = 3, 17 MOD 5 = 2
- Using = instead of == in conditions: = is assignment (gives a value); == is comparison (tests if equal) — using the wrong one is one of the most frequent pseudocode errors
- Confusing / and DIV: / (division) can give a real/decimal result; DIV always gives an integer result by discarding the remainder
- Mixing up AND and OR: AND requires BOTH conditions to be true; OR requires at least ONE — confusing them produces logic that accepts or rejects the wrong values
- Forgetting NOT inverts a boolean:
NOT truegives false and vice versa — useful for toggling flags or reversing conditions
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