How to Design Program Logic Like a Pro

It’s time to connect the dots. In our last video, we learned that Modularisation is about breaking code into smaller pieces. But how do those pieces talk to each other? In Part 2 of Unit 4, we dive into the "pipes" of our program: Parameters and Return values. We also tackle a common student headache—Variable Scope. Key Highlights of this Lesson: • Data Transmission: How the "Main Module" passes specific data to a "Sub-module" using parameters. • The 'Return' Statement: Understanding how a function finishes its job and hands the result back to the caller. • Local vs. Global Scope: Why a variable created in your calculateTax() module might be "invisible" to your printReceipt() module. • The Modular Flowchart Deep Dive: A step-by-step look at the "Double-Line Rectangle" in action within a complex system. • Hierarchy Charts (Structure Charts): How to map out a massive program before you write a single line of pseudocode