AP Computer Science A

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Void

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AP Computer Science A

Definition

Void is a keyword used in method declarations to indicate that the method does not return any value. It is used when a method performs an action but does not produce a result.

"Void" also found in:

Subjects (5)

Practice Questions (12)

Consider the following method: public void printFibonacci(int n) { int a = 0; int b = 1; System.out.print(a + " " + b + " "); for (int i = 2; i < n; i++) { int sum = a + b; System.out.print(sum + " "); a = b; b = sum; } } Assume that the method printFibonacci(6) appears in a method in the same class. What is printed as a result of the method call?
Consider the following method: public void printEvenNumbers(int n) { for (int i = 2; i <= n; i += 2) { System.out.print(i + " "); } } Assume that the method printEvenNumbers(8) appears in a method in the same class. What is printed as a result of the method call?
Consider the following method: public void printPowersOfTwo(int n) { for (int i = 0; i <= n; i++) { int power = (int) Math.pow(2, i); System.out.print(power + " "); } } Assume that the method printPowersOfTwo(5) appears in a method in the same class. What is printed as a result of the method call?
Consider the following method: public void printReverse(String str) { for (int i = str.length() - 1; i >= 0; i--) { System.out.print(str.charAt(i)); } } Assume that the method printReverse("Hello") appears in a method in the same class. What is printed as a result of the method call?
Consider the following method: public void printVowels(String str) { str = str.toLowerCase(); for (int i = 0; i < str.length(); i++) { char ch = str.charAt(i); if (ch == 'a' || ch == 'e' || ch == 'i' || ch == 'o' || ch == 'u') { System.out.print(ch + " "); } } } Assume that the method printVowels("OpenAI") appears in a method in the same class. What is printed as a result of the method call?
Consider the following method: public void printFactors(int n) { for (int i = 1; i <= n; i++) { if (n % i == 0) { System.out.print(i + " "); } } } Assume that the method printFactors(24) appears in a method in the same class. What is printed as a result of the method call?
Consider the following method: public void printPrimeNumbers(int n) { for (int i = 2; i <= n; i++) { boolean isPrime = true; for (int j = 2; j <= Math.sqrt(i); j++) { if (i % j == 0) { isPrime = false; break; } } if (isPrime) { System.out.print(i + " "); } } } Assume that the method printPrimeNumbers(20) 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 will the following code print out? public class NamePrinter { public void printName(String name) { System.out.println("Your name is: " + name); } public void printAge(int age) { System.out.println("Your age is: " + age); } public static void main(String[] args) { NamePrinter np = new NamePrinter(); np.printName("John"); np.printAge(32); } }
What will be the output when the following code is executed? ``` public class A { public void print() { System.out.println("A"); } } public class B extends A { public void print() { System.out.println("B"); } } public class C extends B { public void print() { System.out.println("C"); } } public class Main { public static void main(String[] args) { A obj = new C(); obj.print(); } } ```
Given the block of code below, answer the following question: ```java class Animal { // constructor not shown } class Dog extends Animal { // constructor not shown public void makeSound() { System.out.println("Woof! Woof!"); } } ``` Question: Consider the code above. If we create an object of the `Dog` class and call the `makeSound()` method on that object, what will be outputted?
In the following code block, what is the scope of the variable "name"? public void printGreeting(String name) { System.out.println("Hi " + name); }

Additional resources (1)

AP Computer Science A - Unit 1 Overview: Primitive Types

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Void

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AP Computer Science A

Definition

"Void" also found in:

Subjects (5)

Practice Questions (12)

Additional resources (1)

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Void

from class:

AP Computer Science A

Definition

Related terms

"Void" also found in:

Subjects (5)

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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