
Unit 1: Primitive Types - AP Computer Science A
Authored by Arasaka Teacher
Computers
9th - 12th Grade

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33 questions
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1.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
If your code has a syntax error, what kind of error will you see on the console?
compile-time error
ArithmeticException
logic error
NullPointerException
IndexOutOfBoundsException
2.
DRAG AND DROP QUESTION
3 mins • 1 pt
(a) means to tell the computer that you want to use a variable and give it a name.
(b) means to give that variable its first value.
3.
FILL IN THE BLANK QUESTION
45 sec • 1 pt
The word c_____e means to change source code (like Java) into machine code or bytecode (e.g. 0s and 1s).
4.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
You need to create a variable for the number of cars owned. Which variable initialization is best?
int carsOwned;
double carsOwned;
int num_cars;
double numberOfCarsOwned;
int numberOfCarsOwned;
Answer explanation
You can't have half a car or 0.5 cars, so we should create an "int" variable.
Good variable names are easy to understand, short, and written in camelCase.
5.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
You need to create a variable for the number of computers in the school lab. Which variable initialization is best?
int computersInLab;
double computersInLab;
int num_computers_in_lab;
double numberOfComputersInLab;
int numberOfComputersInLab;
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Why is it important to choose good variable names when creating variables in Java?
Good variable names improve code readability and maintainability, making it easier to cooperate with others..
7.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
You need to create a variable for the price of a sandwich. Which variable initialization is best?
int sandwichPrice;
double sandwichPrice;
int sandwich_price;
double priceOfASandwich;
int priceOfASandwich;
Answer explanation
Prices are usually written in decimal form (e.g. $xx.xx), so it's best to use a "double" variable.
Good variable names are easy to understand, short, and written in camelCase.
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