Скачать или смотреть Full IGCSE Computer Science 0478 February /March 2025 /22 Paper 2 | Solved paper

0:00 Exam tips
1:26 1 MCQ
2:02 2 MCQ
3:41 3 PDLC
6:20 4 Validation
12:28 5 Test data
15:10 6 Error detection
25:23 7 Flowchart
36:18 8 Database
42:09 9 Logic gates

Hey everyone! Hope you're doing great. Today we tackled *0478 Paper 22 (Feb/March 2025)* for Computer Science — covering *algorithms, programming, and logic* in 1 hour 45 minutes for 75 marks. Remember: use a black or dark blue pen (pencil for diagrams only), no erasable ink, no correction fluid, and no brand names.

We started with **multiple-choice**:
*Q1**: Data search in array — chose **Linear Search (C)*
*Q2**: Save hotel name — correct answer: **WriteFile hotels.txt, name (B)*

Then move to **Software Development Life Cycle**:
**Testing**: Check if it works
**Analysis**: Understand the problem
**Coding**: Write the program
**Design**: Use flowcharts or pseudocode

**Validation checks**:
**Presence Check**: Field isn’t blank
**Type Check**: Input must be integer

Wrote a *loop* to re-enter input until it’s a whole number using `mod number, 1`.

**Test data types**:
**Abnormal**: "ABC" — too short
**Boundary**: 9 characters
**Normal**: More than 9 characters
**Pseudocode debugging**:

We fixed 5 key issues in a loop handling 1000 inputs:
1. `highest` was a string — should be an integer
2. Wrong initial value for `highest`
3. Added `count` instead of `numbers[count]`
4. Compared with `total` instead of `highest`
5. Incorrect average calculation
Fixed average output with:
pseudo
OUTPUT "Average is ", ROUND(total / 1000, 2)

*Part C: Add Smallest Number Tracking*
To also find the **smallest number**, I would:
1. *Declare* a new variable `smallest`
2. *Initialize* it with a large number like 1500
3. *Compare* each input — if it’s smaller, update `smallest`
4. *Output* the `smallest` after the loop
That’s it! Solid revision session — let’s keep it up 💪
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Let me know if you want a video script version or notes-style version too!
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