AP Computer Science A #1

This AP Course series is based on computers, and all the answers are based on Java, just to clarify, because some parts of Java share features with other coding languages. One more thing: This quiz is heavily based off of Units 1 and 2, know those well. Good luck!

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Last updated: October 8, 2023

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First submitted	October 2, 2023
Times taken	182
Average score	60.0%
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1. Which of the following is a reference data type?

boolean

int

String

double

2. Which of the following describes a void method?

A method that doesn't print/return any data type

A method that prints a data type but doesn't return it

A method that both prints and returns data types

A method that returns a data type but doesn't print it

3. Which of the following is a proper way to declare a scanner?

Scanner correctAnswer = new Scanner(System.in)

Scanner maybeTheCorrectAnswer = new.Scanner(System.in);

Scanner definitelyTheWrongAnswer = new System.in(Scanner)

Scanner maybeTheWrongAnswer = new Scanner(System.in);

4. Which of the following is a proper way to collect user input through a scanner variable by the name of smartyPants?

int userNum = smartyPants.nextDouble();

int numUser = numUser.nextDouble(smartyPants);

boolean userVerification = nextInt.smartyPants();

double userDoub = smartyPants.nextDouble();

5. Which of the following isn't a function in the math class?

Math.round

Math.abs

Math.pow

Math.int

6. I have declared a string variable called word that is initialized as "Super". If I were to use the substring function and enter the parameters 1 and 3 respectively, what would be the output if printed?

Super

upe

1,3

Sup

7. I worked really hard on a program to compute the area of a square using user input, but it just WON'T WORK OUT! Here is my code: Scanner newDim = new Scanner(System.in); System.out.println("Enter a side of your square."); side = newDim.nextDouble(); area = Math.pow(side,2.0); System.out.println("Area:" + area); PLEASE HELP ME SOLVE THIS IM FREAKING OUT. MY THERAPIST IS SAYING THERE IS MORE THAN ONE ERROR SELECT THE OPTION THAT PINPOINTS BOTH ERRORS.

You haven't stated what data type area and side are. They should be doubles.

You can't declare your scanner variable a name of your choice. It must be called input.

nextDouble isn't a real statement in Java. You must find another way to store the input.

You can't print a string and a double together. Convert the double into a string.

8. Which of the following successfully calls a method by the name of jetPunk?

jetPunk();

start jetPunk();

jetPunk()

calledMethod = jetPunk()

9. Which of the following variables can store a value of 3.6?

int

char