← IGCSE Computer Science Paper 2

Pseudocode assignment, INPUT and OUTPUT in Python

Python for INPUT Age: = replaces the arrow, input() reads text, and int() turns that text into a whole number. OUTPUT Age becomes print(Age); use float() for decimals.

Part of: IGCSE Computer Science 0478 — 7c Pseudocode and Flowcharts — Module 62

Understanding Pseudocode assignment, INPUT and OUTPUT in Python in IGCSE Computer Science Paper 2

What it does: In Python, = is the assignment operator, so it replaces the pseudocode arrow ←. input() returns text, so float() converts it into a decimal number. INPUT Price would only store text without it. INPUT Name becomes Name = input(). The value typed in is stored in the variable on the left of the =. OUTPUT becomes print() in Python. The value to show goes inside the brackets. Both Pascal case and Python style names are valid in Python. Just use the same spelling every time in your program.

Common mistakes: input is a function, so it needs brackets to be called. INPUT Age becomes Age = int(input()), with input() ending in (). The arrow ← is pseudocode only. Python uses = for assignment, so the line should be Total = Count * 2.

Class: _____________________ · Name: _____________________ · Date: _________

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Learning

Duo

Which Python line matches the pseudocode: Score ← 10

Score = 10Score ← 10

Matches

Age = input() Next = Age + 1

↓

Age is still text because int() was not used, so adding 1 to it causes an error. It should be Age = int(input()).

Applying

Meanings

Term

Age = int(input())

Meaning

Python for INPUT Age: = replaces the arrow, input() reads text, and int() turns that text into a whole number. OUTPUT Age becomes print(Age); use float() for decimals.

Practice

Age = int(input())

Testing

Gaps

Name = ()

Check Answer

Spots

1Name = input()

2Age = int(input)

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Quick Questions

1. Which Python line matches the pseudocode: Score ← 10

A. Score = 10 ✓

B. Score ← 10

Python has no arrow. The assignment arrow ← becomes a single equals sign =.

2. Which Python line matches the pseudocode: INPUT Name

A. Name = input() ✓

B. input Name

INPUT Name becomes Name = input(). The value typed in is stored in the variable on the left of the =.

3. Which Python line matches the pseudocode: OUTPUT Total

A. print(Total) ✓

B. output(Total)

OUTPUT becomes print() in Python. The value to show goes inside the brackets.

4. The pseudocode is INPUT Age and Age will be used in a sum. Which Python line is better?

A. Age = input()

B. Age = int(input()) ✓

input() always returns text. Wrap it in int() to get a whole number you can do arithmetic with.

5. The pseudocode is INPUT Price where Price can be 2.50. Which Python line is better?

A. Price = int(input())

B. Price = float(input()) ✓

int() only handles whole numbers, so typing 2.50 would cause an error. Use float() for decimals.

Match the Pairs

Age = int(input()) → Python for INPUT Age: reads what the user types and turns the text into a whole number

print(Name, Score) → Python for OUTPUT Name, Score: shows both values on one line

Python has no ← arrow, so the pseudocode Total ← 0 is written with a plain = sign → Total = 0

To read a decimal number such as a price, wrap input() in float() so the text becomes a real number → Price = float(input())

Age = input() Next = Age + 1 → Age is still text because int() was not used, so adding 1 to it causes an error. It should be Age = int(input()).

Total ← 5 OUTPUT Total → Pseudocode was left unchanged: Python needs Total = 5 and print(Total) instead of the arrow and OUTPUT.

Key Term

Age = int(input())

Python for INPUT Age: = replaces the arrow, input() reads text, and int() turns that text into a whole number. OUTPUT Age becomes print(Age); use float() for decimals.

Fill in the Blanks

1. Name = input()

Hint: Type the function that reads text typed by the user.

2. Age = int(input())

Hint: Type the function that turns the text into a whole number.

3. Price = float(input())

Hint: Type the function that turns the text into a decimal number.

4. Total = 7 + 3 print("Total:", Total)

Hint: Type the function that replaces OUTPUT and shows values on screen.

5. Score = int(input())

Hint: Type the Python symbol that replaces the pseudocode assignment arrow.

Spot the Error

Question 1

A Name = input()

B Age = int(input)

C print(Name, Age)

Line B — input is a function, so it needs brackets to be called. INPUT Age becomes Age = int(input()), with input() ending in ().

Question 2

A Count = int(input())

B Total ← Count * 2

C print(Total)

Line B — The arrow ← is pseudocode only. Python uses = for assignment, so the line should be Total = Count * 2.

Question 3

A Name = input()

B Score = int(input())

C Bonus = 5

D print(Name + Score + Bonus)

Line D — Name is text and Score is a number, so + cannot join them and gives a TypeError. Separate the values with commas: print(Name, Score + Bonus).

Question 4

A Length = float(input())

B Width = input()

C Area = Length * Width

D print(Area)

Line B — input() returns text, so multiplying Length by Width causes an error. A number must be read with float(input()).

Question 5

A Age == int(input())

B Next = Age + 1

C print(Next)

Line A — A double == compares values, it does not assign. Use a single = to store the input in Age: Age = int(input()).

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