IGCSE Computer Science Paper 2 Definitions Worksheet: 8.1b Sequence, Selection and Iteration (Modules 358–368)
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Key terms
Write what each term means, in your own words.
1
INPUT and OUTPUT
2
//
3
sequence
4
DIV and MOD
5
= and <>
6
< <= > >=
7
AND
8
OR
9
NOT
10
(A OR B) AND C
Answer Key
IGCSE Computer Science Paper 2 · Modules 358–368 · Student wording will vary for definitions
1INPUT and OUTPUT — INPUT stores a value the user types into a variable. OUTPUT displays a message or value on screen. Show several items by separating them with commas.
2// — Starts a comment in Cambridge pseudocode. Statements inside a loop or IF are indented four spaces, and ELSE lines up with its IF, so the structure is easy to read.
3sequence — A program made of statements like DECLARE, <-, INPUT and OUTPUT that run one after another from top to bottom, with no selection or iteration. Changing the order changes the result.
4DIV and MOD — Arithmetic operators beside + - * /. DIV gives the whole-number quotient (17 DIV 5 = 3). MOD gives the remainder (17 MOD 5 = 2). Number MOD 2 = 0 tests for even. Brackets set the order.
5= and <> — = tests whether two values are equal and <> tests whether they are not equal. Each gives TRUE or FALSE. Assignment uses <- instead, not =.
6< <= > >= — Relational operators that compare the size of two values and give TRUE or FALSE. < and > leave out the boundary value; <= and >= include it, so 50 >= 50 is TRUE but 50 > 50 is FALSE.
7AND — AND joins two conditions and is TRUE only when both are TRUE, e.g. Age >= 13 AND Age <= 19. If either condition is FALSE, the whole condition is FALSE.
8OR — Joins two conditions. The result is TRUE when at least one condition is TRUE, e.g. Day = "Sat" OR Day = "Sun". It is only FALSE when both conditions are FALSE.
9NOT — A logical operator that reverses a condition: NOT TRUE is FALSE and NOT FALSE is TRUE. For example, NOT (Score >= 50) is TRUE only when Score is below 50.
10(A OR B) AND C — Brackets are worked out first. Without them NOT is done first, then AND, then OR. So A OR B AND C means A OR (B AND C), and brackets change that order.