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Boolean

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AP Computer Science A

Definition

A boolean is a data type that can only have two possible values: true or false. It is often used in programming to make decisions and control the flow of a program.

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"Boolean" also found in:

Subjects (5)

Practice Questions (9)

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 boolean isValidEmail(String email) { /* implementation not shown */ } Which of the following lines of code, if located in a method in the same class as isValidEmail, will compile without an error?
Consider the following method: public static boolean isPalindrome(String word) { int length = word.length(); for (int i = 0; i < length / 2; i++) { if (word.charAt(i) != word.charAt(length - 1 - i)) { return false; } } return true; } Assume that the following code segment appears in a class: boolean result = isPalindrome("racecar"); System.out.println("Is 'racecar' a palindrome? " + result); What is printed as a result of executing the code segment?
Consider the following method: public static boolean isEven(int number) { return number % 2 == 0; } Assume that the following code segment appears in a class: boolean result = isEven(7); System.out.println("Is 7 an even number? " + result); What is printed as a result of executing the code segment?
How many parameters does the method with header "public void doSomething (double a, double b, int c, boolean flag, String text)" have?
What does the following code do? public static boolean codeBlock(int[] array) { for (int i = 0; i < array.length - 1; i++) { for (int j = i + 1; j < array.length; j++) { if (array[j] == array[i]) { return true; } } } return false; }
What does the following code do? public static boolean codeBlock(int[] array) { for (int i: array) { if (i >= 25) { return false; } } return true; }
What does the following code do? public static boolean codeBlock(ArrayList<Integer> array) { for (int i: array) { if (i % 3 == 1 || i % 3 == 2) { return false; } } return true; }
Which statement correctly initializes an array of type `boolean` named `flags` with the elements `true`, `false`, and `true` in that order?

Additional resources (1)

AP Computer Science A - Unit 1 Overview: Primitive Types

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Boolean

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AP Computer Science A

Definition

"Boolean" also found in:

Subjects (5)

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Additional resources (1)

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Boolean

from class:

AP Computer Science A

Definition

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"Boolean" also found in:

Subjects (5)

Practice Questions (9)

Additional resources (1)

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