AP CSA 2.2 Exercise 1: True or False, Printed

Unit 2: Selection and Iteration · Lesson 2.2 · Exercise 1

True or False, Printed

Boolean Expressions. Write real Java, run it, and submit it to be graded against hidden test cases.

Back to the Lesson 2.2 page All Unit 2 lessons

Why this one is worth doing

A boolean expression is a value, not a question. Printing one directly is the fastest way to stop thinking of comparisons as something that only lives inside an if.

What to write

Read two integers, a and b.
Print the value of a > b.
Print the value of a == b.
Print the value of a != b.
Print the value of a <= b.
Store a >= b in a boolean variable and print that variable on the last line.

Your program reads

Two integers on separate lines: a, then b.

Your program prints

Five lines, each true or false.

Worked examples

These are the cases you can see. There are more you cannot, and they use different values, so an answer that prints these numbers as constants will fail.

Example 1 input

5
3

Example 1 output

true
false
true
false
true

Example 2 input

4
4

Example 2 output

false
true
false
true
true

Your answer

Main.java

import java.util.Scanner;

public class Main {
  public static void main(String[] args) {
    Scanner input = new Scanner(System.in);
    int a = input.nextInt();
    int b = input.nextInt();

    // Five lines of true or false. No if statement is needed or wanted.
  }
}

Input for the Run button

Run sends whatever is in the input box below. Submitting runs your program against every test case, including hidden ones with different input.

Stuck?

Hint 1

System.out.println(a > b) prints the word true or the word false. You do not need an if to produce them.

Hint 2

= assigns and == compares. boolean atLeast = a >= b; uses both in one line, and they mean different things.

Hint 3

a != b is always the opposite of a == b, so those two lines can never match.

Where to go next

Rework the Lesson 2.2 page Pick another Unit 2 lesson

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