How to Write Pseudocode
💻 Lecture 3: Pseudocode | Edexcel IGCSE Computer Science
Welcome back to our IGCSE Computer Science masterclass series! In our previous sessions, we explored how to map out algorithms using structured written text and visual flowcharts. Today, we are taking a massive step closer to actual programming by diving into Pseudocode.
Pseudocode is a text-based way to design algorithms without worrying about the strict syntax rules of specific programming languages like Python or Java. In this lecture, we lay down the absolute fundamental building blocks of data manipulation, variable storage, and structures.
🔢 Using Constants
If a value should never change while a program is running (such as mathematically evaluating a circle's circumference or area using pi), use an unalterable constant identifier block:
CONST REAL PI
SET PI TO 3.14159
📊 1D & 2D Data Arrays
Arrays allow us to store collections of identical data types under a single identifier name using zero-based index numbering:
(1) 1D Array Example:
Storing a 2-times table sequence or school rosters:
SET arrayTable TO [2, 4, 6, 8, 10, 12, 14, 16, 18, 20]
Accessing the first element: arrayTable[0] = 2
(2) 2D Array Matrix:
Organizing complex relational information into rows and columns:
info = [["Lina", "99"], ["Mina", "97"]] where specific coordinate lookups retrieve exact data intersections.
🔠 Valid Identifier Rules
When creating names for variables, or constants, avoid invalid formats. Ensure names use standard camelCase or alphanumeric spacing rules (e.g., myValue or counter). Avoid spaces or unapproved dashes (my-value).
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