← IGCSE Computer Science Paper 2

Pseudocode as a design method

A structured, code-like way of writing an algorithm that follows set rules but does not need to run on a computer. It shows the logic of a design, not exact programming syntax.

Part of: IGCSE Computer Science 0478 — 7a Program Development Life Cycle — Module 19

Understanding Pseudocode as a design method in IGCSE Computer Science Paper 2

What it does: The decision logic (if the score is at least 50, output Pass) is clear without language-specific syntax, so it could be coded in Python, VB or Java. The arrow ← for assignment and the Pascal case identifiers are part of the set rules for exam pseudocode. Pseudocode is a design method. It shows the logic of an algorithm and does not have to run on a computer. Pseudocode focuses on the logic. Exact programming syntax is only needed when you write real code. Logic matters more than syntax in a design. Even so, you should still try to follow the Cambridge keyword style.

Common mistakes: Cambridge pseudocode uses the assignment arrow ← to store a value in a variable. The = sign is used for comparisons. It should be Total ← Total + Mark. Text to be displayed must be written as a string in double quotes. Without quotes, Allowed looks like a variable. It should be OUTPUT "Allowed".

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This module's key terms are also in a printable crossword (Modules 17–26) and word search (Modules 1–26).

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Learning

Duo

Which statement about pseudocode is correct?

It must be compiled before a computer can run itIt follows set rules but does not need to run on a computer

Matches

print("Hello") // thinking this is pseudocode

↓

print() is Python syntax, so it is a programming language, not Cambridge pseudocode. Pseudocode should use OUTPUT "Hello" instead.

Applying

Meanings

Term

pseudocode

Meaning

A structured, code-like way of writing an algorithm that follows set rules but does not need to run on a computer. It shows the logic of a design, not exact programming syntax.

Practice

// Check a test mark

Testing

Gaps

Num

Check Answer

Spots

3INPUT Mark

4Total = Total + Mark

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Quick Questions

1. Which statement about pseudocode is correct?

A. It follows set rules but does not need to run on a computer ✓

B. It must be compiled before a computer can run it

Pseudocode is a design method. It shows the logic of an algorithm and does not have to run on a computer.

2. What does pseudocode mainly show?

A. The logic of the design ✓

B. The exact syntax of one programming language

Pseudocode focuses on the logic. Exact programming syntax is only needed when you write real code.

3. Which is a difference between pseudocode and a programming language?

A. Pseudocode must follow exact syntax so a computer can run it

B. A programming language must follow exact syntax so a computer can run it ✓

A programming language is run by a computer, so its syntax must be exact. Pseudocode is written for people to read.

4. A student writes pseudocode that has the right logic but a small spelling slip in a keyword. Which matters more?

A. The exact spelling of every keyword

B. The logic of the algorithm ✓

Logic matters more than syntax in a design. Even so, you should still try to follow the Cambridge keyword style.

5. In a Cambridge 0478 exam, which line is written in the expected pseudocode style?

A. OUTPUT "Hello" ✓

B. print("Hello")

Cambridge pseudocode uses capital-letter keywords such as OUTPUT. print() is Python syntax.

Match the Pairs

pseudocode → A structured, code-like way of writing an algorithm that follows set rules but does not need to run on a computer

OUTPUT "Hello" → A Cambridge-style pseudocode line that shows a message to the user, written with a capital-letter keyword

Pseudocode shows the logic of a design, so the same idea can later be written in any programming language → IF Score >= 50 THEN OUTPUT "Pass" ENDIF

Pseudocode follows Cambridge 0478 style rules, such as capital-letter keywords and the arrow for assignment → Total ← Price * Quantity

print("Hello") // thinking this is pseudocode → print() is Python syntax, so it is a programming language, not Cambridge pseudocode. Pseudocode should use OUTPUT "Hello" instead.

Pseudocode must be typed into a compiler and run without errors → Pseudocode does not need to run on a computer. It is for planning the logic of an algorithm, so small syntax slips matter less than clear logic.

Key Term

pseudocode

A structured, code-like way of writing an algorithm that follows set rules but does not need to run on a computer. It shows the logic of a design, not exact programming syntax.

Fill in the Blanks

1. OUTPUT "Enter a number" INPUT Num OUTPUT Num * 2

Hint: Type the keyword that reads a value from the user into a variable.

2. IF Score >= 50 THEN OUTPUT "Pass" ENDIF

Hint: Type the keyword that follows the condition in an IF statement.

3. INPUT Price Total ← Price * 3 OUTPUT Total

Hint: Type the pseudocode assignment symbol (typed as <- on a keyboard).

4. FOR Count ← 1 TO 5 OUTPUT Count NEXT Count

Hint: Type the keyword that links the start value to the end value of the loop.

5. // Calculate the area of a rectangle Area ← Length * Width OUTPUT Area

Hint: Type the symbol that starts a comment line in Cambridge pseudocode.

Spot the Error

Question 1

A DECLARE Total : INTEGER

B Total ← 0

C INPUT Mark

D Total = Total + Mark

E OUTPUT Total

Line D — Cambridge pseudocode uses the assignment arrow ← to store a value in a variable. The = sign is used for comparisons. It should be Total ← Total + Mark.

Question 2

A INPUT Age

B IF Age >= 16 THEN

C OUTPUT Allowed

D ENDIF

Line C — Text to be displayed must be written as a string in double quotes. Without quotes, Allowed looks like a variable. It should be OUTPUT "Allowed".

Question 3

A DECLARE Score : NUMBER

B INPUT Score

C OUTPUT Score * 2

Line A — Cambridge pseudocode only uses the data types INTEGER, REAL, CHAR, STRING and BOOLEAN. NUMBER is not one of them. It should be DECLARE Score : INTEGER.

Question 4

A INPUT Count

B Total ← 0

C FOR i ← 1 UNTIL Count

D INPUT Num

E Total ← Total + Num

F NEXT i

Line C — A count-controlled loop in pseudocode uses the keyword TO between the start and end values. UNTIL belongs to REPEAT loops. It should be FOR i ← 1 TO Count.

Question 5

A WHILE Password <> "abc"

B INPUT Password

C ENDWHILE

Line A — A WHILE loop header must end with the keyword DO so the structure is complete. It should be WHILE Password <> "abc" DO.

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