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Double

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AP Computer Science A

Definition

In Java, Double is both a wrapper class for primitive type double and also represents real numbers with decimal points. It provides useful methods for performing mathematical operations on these numbers.

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Practice Questions (12)

What is the result of 'double b = 10.0 / 4'?
What is the correct way to cast an integer to a double?
What is the value of _a_ in _double a = 3 + 2;_?
What is the value of _z_ in _double z = 7 / 2;_?
Consider the following method: public void calculatePower(double base, int exponent) { double result = Math.pow(base, exponent); printPower(base, exponent, result); } public void printPower(double base, int exponent, double result) { System.out.print(base + "^" + exponent + " = " + result); } Assume that the method calculatePower(2, 3) appears in a method in the same class. What is printed as a result of the method call?
Consider the following method: public void calculateSquareRoot(double n) { double squareRoot = Math.sqrt(n); printSquareRoot(n, squareRoot); } public void printSquareRoot(double n, double squareRoot) { System.out.print("Square root of " + n + " = " + squareRoot); } Assume that the method calculateSquareRoot(16) appears in a method in the same class. What is printed as a result of the method call?
What is the result of the following code? public class Shapes { public double calculateCircleArea(double radius) { return Math.PI * Math.pow(radius, 2); } public double calculateRectangleArea(double length, double width) { return length * width; } public static void main(String[] args) { Shapes shapes = new Shapes(); System.out.println(shapes.calculateCircleArea(5) + shapes.calculateRectangleArea(10, 2)); } }
Consider the following class definition. public class Animal { private String species; private int age; private double weight; public Animal(String animalSpecies, int animalAge, double animalWeight) { species = animalSpecies; age = animalAge; weight = animalWeight; } public void eat() { weight += 5; } public double getWeight() { return weight; } } Assume that the following code segment appears in a class other than Animal. java Copy code Animal dog = new Animal("Dog", 3, 15); dog.eat(); System.out.println(dog.getWeight()); What is printed as a result of executing the code segment?
What is the result of the following code?<br>Double d = 3.14;<br>System.out.println(d);
Which of the following is a correct way to convert a double to a Double object?
How many parameters does the method with header "public void doSomething (double a, double b, int c, boolean flag, String text)" have?
Which statement correctly initializes an array of type `double` with 5 elements?

Additional resources (1)

AP Computer Science A - Unit 1 Overview: Primitive Types

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Double

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AP Computer Science A

Definition

"Double" also found in:

Practice Questions (12)

Additional resources (1)

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Double

from class:

AP Computer Science A

Definition

Related terms

"Double" also found in:

Practice Questions (12)

Additional resources (1)

© 2024 Fiveable Inc. All rights reserved.

AP® and SAT® are trademarks registered by the College Board, which is not affiliated with, and does not endorse this website.

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