Quick Answer
The answer is double. For storing a currency value with two decimal places, double is the most appropriate primitive type because it is a 64-bit IEEE 754 floating-point type offering 15-16 significant digits of precision, which comfortably handles typical monetary amounts without the rounding errors that can accumulate with the 32-bit float. On the Oracle Java Foundations 1Z0-811 exam, this question tests your understanding of primitive data types and their precision limits; a common trap is choosing float for its smaller memory footprint, but the exam expects double as the default for decimal literals and the safer choice for currency calculations. Remember that double gives you double the precision of float, making it the standard for financial values in Java. A helpful memory tip: think of double as the “default decimal” type—when in doubt, double your precision.
This 1Z0-811 practice question tests your understanding of primitives, strings and operators. Compare every option against the stated constraints before choosing — the best answer satisfies all requirements, not just the most obvious one. 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 needs to store a currency value with two decimal places. Which primitive type is most appropriate?
float
Why wrong: Less precision than double, but still floating-point; double is more common.
double
Commonly used for currency with two decimal places, though BigDecimal is more accurate.
long
Why wrong: Integer type.
int
Why wrong: Cannot represent 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
double
Option B (double) is the most appropriate primitive type for storing a currency value with two decimal places because double is a 64-bit IEEE 754 floating-point type that can represent fractional values with sufficient precision for typical monetary amounts. While float (32-bit) could also store decimals, double provides higher precision (15-16 significant digits) and is the default type for decimal literals in Java, making it the standard choice for currency calculations in the exam context.
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
Less precision than double, but still floating-point; double is more common.
double
Why this is correct
Commonly used for currency with two decimal places, though BigDecimal is more accurate.
Related concept
Read the scenario before looking for a memorised answer.
long
Why it's wrong here
Integer type.
int
Why it's wrong here
Cannot represent decimals.
Common exam traps
The trap here is that candidates often choose float thinking it is sufficient for decimal values, but they overlook that double is the default type for decimal literals in Java and provides greater precision, which is critical for currency to avoid rounding errors in calculations.
Detailed technical explanation
Under the hood, double uses 1 sign bit, 11 exponent bits, and 52 mantissa bits, allowing it to represent values like 0.01 exactly in binary? Actually, 0.01 cannot be represented exactly in binary floating-point (it's a repeating fraction), which is why for precise financial calculations, BigDecimal is recommended over double. However, for the 1Z0-811 exam, double is considered the appropriate primitive for currency with two decimal places because it is the only primitive type among the options that can store fractional values with sufficient precision for basic use cases.
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 1Z0-811 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
Primitives, Strings and Operators — This question tests Primitives, Strings and Operators — Read the scenario before looking for a memorised answer..
The correct answer is: double — Option B (double) is the most appropriate primitive type for storing a currency value with two decimal places because double is a 64-bit IEEE 754 floating-point type that can represent fractional values with sufficient precision for typical monetary amounts. While float (32-bit) could also store decimals, double provides higher precision (15-16 significant digits) and is the default type for decimal literals in Java, making it the standard choice for currency calculations in the exam context.
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 1Z0-811 practice question is part of Courseiva's free Oracle 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 1Z0-811 exam.
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