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	59
Average score	60.0%
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1. Which of the following is a reference data type?

double ✓

String ✓

int ✓

boolean ✓

2. Which of the following describes a void method?

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 ✓

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

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

Scanner maybeTheWrongAnswer = new Scanner(System.in); ✓

Scanner correctAnswer = new Scanner(System.in) ✓

Scanner definitelyTheWrongAnswer = new System.in(Scanner) ✓

Scanner maybeTheCorrectAnswer = 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 numUser = numUser.nextDouble(smartyPants); ✓

boolean userVerification = nextInt.smartyPants(); ✓

double userDoub = smartyPants.nextDouble(); ✓

int userNum = smartyPants.nextDouble(); ✓

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

Math.round ✓

Math.pow ✓

Math.abs ✓

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?

1,3 ✓

Sup ✓

Super ✓

upe ✓

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. ✓

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. ✓

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

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

jetPunk() ✓

jetPunk(); ✓

start jetPunk(); ✓

calledMethod = jetPunk() ✓

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

int ✓

char ✓