Trace Tables & Dry Running Code Explained | IGCSE Edexcel Computer Science Ep.03

🔍 Trace Tables & Dry Running Code Explained | IGCSE Edexcel Computer Science Ep.03 Trace tables are one of the most tested topics in your 4CP0 exam — and one of the most misunderstood. In this episode we fix that completely. You will learn exactly how to dry run code, complete a trace table step by step, and avoid the mistakes that cost students marks every year. By the end of this episode, trace table questions will be free marks for you. ✅ What you'll learn: What dry running means and why it matters How to set up a trace table — variables, columns, output The two rules every student must know: one row per iteration, and only fill a cell when a variable changes Tracing IF/ELSE selection — step by step Tracing a WHILE loop through every iteration The most common mistakes examiners report every year Full exam-style question with complete mark scheme 🗂️ TIMESTAMPS 00:00 – Hook 01:00 – What is dry running? 02:30 – How to build a trace table 05:00 – Tracing IF/ELSE selection 07:30 – Tracing a WHILE loop 10:30 – Common mistakes to avoid 12:00 – Exam practice question 13:00 – Summary & outro 📌 Exam board: Pearson Edexcel | Spec: 4CP0 | Papers: 01 & 02 🔔 Subscribe and hit the bell — new episode every week. 👉 Previous episode: Ep.02 — Algorithms, Flowcharts & Pseudocode 👉 Next episode: Ep.04 — Search Algorithms: Linear & Binary Search This channel is for students sitting the Pearson Edexcel International GCSE Computer Science (4CP0) — Year 10, Year 11, or exam revision. Every episode follows the official specification and uses exact Pearson pseudocode syntax. #IGCSEComputerScience #EdexcelIGCSE #4CP0 #TraceTable #DryRun #IGCSERevision #ComputerScienceRevision #PearsonEdexcel #Algorithms #IGCSE2025 #IGCSE2026 #CSWithLamyaa