AP CSA 1.11 Exercise 1: Distance and Damage

Unit 1: Using Objects and Methods · Lesson 1.11 · Exercise 1

Distance and Damage

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

Back to the Lesson 1.11 page All Unit 1 lessons

Why this one is worth doing

Four Math methods in one expression each. The trap is not the maths, it is remembering which ones hand you back a double whether you wanted one or not.

What to write

Read four integers: x1, y1, x2, y2, the coordinates of two points.
Print the horizontal distance using Math.abs.
Print the vertical distance using Math.abs.
Print the straight line distance using Math.sqrt and Math.pow.
Print the larger of the two coordinates x1 and y2 using Math.max, and then the smaller of x2 and y1 using Math.min, on separate lines.

Your program reads

Four integers on separate lines: x1, y1, x2, y2.

Your program prints

Five lines: the horizontal distance, the vertical distance, the straight line distance, the max and the min.

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

Example 1 output

Example 2 input

Example 2 output

Your answer

Main.java

import java.util.Scanner;

public class Main {
  public static void main(String[] args) {
    Scanner input = new Scanner(System.in);
    int x1 = input.nextInt();
    int y1 = input.nextInt();
    int x2 = input.nextInt();
    int y2 = input.nextInt();

    // Five lines.
  }
}

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

Math.abs(int) gives you an int back, so the first two lines have no decimal point.

Hint 2

Math.sqrt always returns a double, so the third line always shows one. A distance of 5 prints as 5.0.

Hint 3

Math.pow(dx, 2) works, and so does dx * dx. The exam accepts either, and dx * dx stays an int.

Where to go next

Rework the Lesson 1.11 page Pick another Unit 1 lesson

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