Скачать или смотреть Full IGCSE (0478) | O Level Computer Science (2210)October/November 2024 /21 Paper 2 | Solved paper

0:00 Exam tips
1:36 1 MCQ
4:19 2 MCQ
5:27 3 Operator
7:32 4 PDLC
8:17 5 Design stage
9:55 6 Pseudocode
16:29 7 Logic circuit
19:40 8 Flowchart
29:00 9 Error detection, trace table
38:44 10 Database

Hey everyone! Hope you're all doing well and making progress with your exam prep. Today, we’re tackling another past paper—IGCSE Computer Science Paper 2 (0478/21) from Oct/Nov 2024. It’s a 1-hour 45-minute paper, and you must answer on the question paper using a black or dark blue pen (pencil only for diagrams). No calculators or correction fluid allowed!

Let’s start with Q1—checking verification methods. The correct answer is *visual check* because length, range, and type checks are validation. Moving on, Boolean expressions use *truth tables* to show inputs and outputs.

Next, operator types—logical (=), Boolean (AND), and arithmetic (DIV, +). Got it? Now, stages of the program development life cycle: **analysis, design, and testing**. For designing solutions, we use **structure diagrams, flowcharts or pseudocode**.

On to coding—completing a pseudocode algorithm for counting zeros in an array. We initialize `T=0`, check if `A[C]=0`, and update `T` or `I`. Next, writing pseudocode to display results with meaningful messages: `OUTPUT "Number of zeros: ", T` and `OUTPUT "Total non-zero elements: ", I`. For meaningful identifiers, we use *"myArray"* instead of `A`, *"counter"* for `T`, and *"index"* for `C`.

Now, logic circuits—writing expressions and completing a truth table. *Not X OR (Y OR Z)* gives the correct result. Finally, we move to a password validation program: check for *at least 8 characters* and ensure it **differs from the stored password**.

I’m explaining a simple temperature-checking algorithm. The program asks for a *temperature input* and categorizes it as *too high, too low, or normal* based on a defined range. It continues looping *until* the temperature input is **999**, which terminates the loop.

During review, we identified *four errors* in the algorithm:
1️⃣ *Line 3:* "temp" should be "temperature."
2️⃣ *Line 4:* "=" should be "≠" (not equal to).
3️⃣ *Line 14:* "or" should be "and" to avoid incorrect classification.
4️⃣ *Line 19:* "while" should be "until" to correctly end the loop.

The corrected algorithm now follows the logic properly. The valid *temperature range* is *35.0 to 38.0**—anything outside is abnormal. A **trace table* confirms how different inputs are processed, with **999 ending the loop**.

Understanding *tricks* in the question, like ignoring *misleading values**, ensures full marks. **Attention to detail* is key.

Next, move to *database question* about a **cheese shop's inventory**:
The *table has 19 records* (not 31)
*Primary key:* "CH HNO" (unique identifier)
*SQL query output:* Extracted data for *supplier ABC* by selecting *CH HNO and weight KG* correctly.

For *further learning**, I recommend reviewing **database video tutorials**. Stay focused & **keep practicing* to excel in exams! 🚀

That’s it! You’re doing great—keep practicing, and you’ll ace the exam! 🚀
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IGCSE | O Level Solved Papers - Computer Systems | Algorithms, Programming and Logic
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