Lesson Notes By Weeks and Term v4 - SHS 2
APP DEVELOPMENT
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APP DEVELOPMENT
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Subject: Computing
Class: SHS 2
Term: 2nd Term
Week: 10
Grade code: 2.2.2.LI.2
Strand code: 2
Sub-strand code: 2
Content standard code: 2.2.2.CS.1
Indicator code: 2.2.2.LI.2
Theme: COMPUTATIONAL THINKING (PROGRAMMING LOGIC)
Subtheme: APP DEVELOPMENT
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Good morning, class. Every day, many of you use apps on your phones—WhatsApp, TikTok, the MTN Mobile Money app, or even the Bolt app to order a ride. Have you ever wondered how these apps work? They are not magic. They are built using a set of clear, step-by-step instructions that tell the computer or phone exactly what to do. Today, we are taking our very first step into the world of app development. We will learn how to create these instructions, which are the foundation of every single app, game, and website you use. Understanding this logic is the key to creating our own simple applications to solve problems right here in our communities.
Concept 1: Algorithms - The Recipe for Your App
An algorithm is simply a finite, step-by-step set of instructions designed to perform a specific task or solve a problem. Think of it like a recipe for cooking Jollof rice. The Recipe (Algorithm): It has a list of ingredients (Inputs) and a set of clear steps to follow (Process). If you follow the steps correctly, you get a delicious pot of Jollof (Output). A Computer Program: It has data (Inputs) and an algorithm (Process) that tells the computer how to use that data to produce a result (Output).
Characteristics of a Good Algorithm: Unambiguous: Each step must be clear and have only one meaning. Input: It must have zero or more well-defined inputs. Output: It must have one or more well-defined outputs. Finiteness: It must end after a finite number of steps.
We will write our algorithms using pseudocode. "Pseudo" means 'fake', so pseudocode is a fake, simplified code written in plain English. It helps us plan our program logic without worrying about the strict rules of a real programming language like Python or Java.