This FC0-U61 practice question tests your understanding of it concepts and terminology. 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 developer is writing a program that processes whole numbers only. Which data type should be used?
Float
Why wrong: Floats store numbers with decimal points.
String
Why wrong: Strings are for text, not numeric calculations.
Boolean
Why wrong: Booleans represent true/false, not numbers.
Integer
Integers store whole numbers without decimals.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Integer
The correct answer is D (Integer) because the program processes whole numbers only, and the integer data type is specifically designed to store non-fractional numeric values without decimal points. In most programming languages, integers are stored as 32-bit or 64-bit binary values, making them efficient for arithmetic operations on whole numbers.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Float
Why it's wrong here
Floats store numbers with decimal points.
String
Why it's wrong here
Strings are for text, not numeric calculations.
Boolean
Why it's wrong here
Booleans represent true/false, not numbers.
Integer
Why this is correct
Integers store whole numbers without decimals.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
The trap here is that candidates often confuse 'whole numbers' with 'numbers that might have decimals' and choose Float, not realizing that integer types are the correct and efficient choice for non-fractional data.
Detailed technical explanation
Under the hood, integers are stored in two's complement format for signed values, allowing direct binary arithmetic without the mantissa and exponent overhead of floating-point types. A real-world scenario is a banking application counting transactions: using float could cause cumulative rounding errors (e.g., 0.1 + 0.2 != 0.3 in binary), while integer types guarantee exact representation for whole numbers up to 2^31-1 (32-bit) or 2^63-1 (64-bit).
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the FC0-U61 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
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FAQ
IT Concepts and Terminology — This question tests IT Concepts and Terminology — Read the scenario before looking for a memorised answer..
The correct answer is: Integer — The correct answer is D (Integer) because the program processes whole numbers only, and the integer data type is specifically designed to store non-fractional numeric values without decimal points. In most programming languages, integers are stored as 32-bit or 64-bit binary values, making them efficient for arithmetic operations on whole numbers.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 25, 2026
This FC0-U61 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the FC0-U61 exam.
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