AP COMPUTER SCIENCE A UNIT 1 EXAM QUESTIONS AND ANSWERS ALREADY PASSED
7 views 0 purchase
Course
AP COMPUTER SCIENCE A
Institution
AP COMPUTER SCIENCE A
AP COMPUTER SCIENCE A UNIT 1
EXAM QUESTIONS AND ANSWERS
ALREADY PASSED
What are the main primitive data types in Java, and what are they used for?
The main primitive data types in Java are `int` (for integers), `double` (for floating-point
numbers), `boolean` (for true/false values), `c...
and `float`. These are used to store basic data values directly in memory.
Consider the following code segment:
```java
int x = 5;
int y = 2;
double result = x / y;
```
What is the value of `result`, and why?
1
, ✔✔ The value of `result` will be `2.0`. Since both `x` and `y` are integers, the division `x / y`
performs integer division, resulting in 2. The result is then implicitly cast to a double, but the
value remains 2.0.
How do you declare a constant in Java, and why is it useful?
✔✔ You declare a constant in Java using the `final` keyword, like so: `final int
CONSTANT_NAME = 10;`. Constants are useful because they make your code more readable
and maintainable, ensuring that the value cannot be changed once assigned.
What is the difference between `float` and `double` in Java?
✔✔ `float` is a 32-bit floating-point data type, while `double` is a 64-bit floating-point data type.
`double` provides more precision and is generally used when more accurate decimal values are
required.
Consider the following code segment:
```java
boolean isValid = (3 + 4 > 5) && (10 % 3 == 1);
2
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through EFT, credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying this summary from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller BrilliantScores. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy this summary for R184,66. You're not tied to anything after your purchase.
