PCEP Practice Question: Data Types, Variables, Basic I/O and Operators
This PCEP practice question tests your understanding of data types, variables, basic i/o and operators. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A junior developer writes: result = input("Enter first: ") + input("Enter second: ") and then prints result. When entering 5 and 3, the output is '53'. Which explanation is correct?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "first"
Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The input() function returns a string, so + performs string concatenation.
Option D is correct because the `input()` function in Python always returns a string, regardless of what the user types. When the `+` operator is used with two strings, it performs concatenation, not arithmetic addition. Thus, entering 5 and 3 results in the strings '5' and '3' being joined to produce '53'.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
The code uses the wrong operator; it should use the & operator for addition.
Why it's wrong here
The & operator is for bitwise AND, not addition.
✗
The input() function automatically selects the correct type, but the + operator is overloaded to concatenate.
Why it's wrong here
input() does not automatically select type; it always returns a string.
✗
Python automatically converts strings to numbers when using +, but only for integers.
Why it's wrong here
Python does not automatically convert strings to numbers.
✓
The input() function returns a string, so + performs string concatenation.
Why this is correct
input() always returns a string, so + concatenates.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may assume `input()` returns a numeric type when numbers are entered, or that Python's dynamic typing will automatically convert strings to numbers for addition, leading them to choose option B or C instead of recognizing the default string behavior.
Detailed technical explanation
How to think about this question
Under the hood, `input()` reads a line from standard input and returns it as a string object, with no implicit type conversion. The `+` operator is polymorphic: for numeric types it performs addition, but for strings it triggers the `__add__` method to concatenate. A real-world scenario where this matters is when processing user input for calculations; developers must explicitly convert with `int()` or `float()` to avoid unintended concatenation.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Data Types, Variables, Basic I/O and Operators — This question tests Data Types, Variables, Basic I/O and Operators — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The input() function returns a string, so + performs string concatenation. — Option D is correct because the `input()` function in Python always returns a string, regardless of what the user types. When the `+` operator is used with two strings, it performs concatenation, not arithmetic addition. Thus, entering 5 and 3 results in the strings '5' and '3' being joined to produce '53'.
What should I do if I get this PCEP question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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