AP CSA 1.6 Exercise 1: Score Multiplier

Unit 1: Using Objects and Methods · Lesson 1.6 · Exercise 1

Score Multiplier

Compound Assignment Operators. Write real Java, run it, and submit it to be graded against hidden test cases.

Back to the Lesson 1.6 page All Unit 1 lessons

Why this one is worth doing

Every compound operator rewrites the variable it is applied to. Print after each one and the sequence stops being something you have to hold in your head.

What to write

Read one integer as the starting score.
Apply these four operators to it, in this order: += 10, then *= 3, then -= 4, then %= 7.
Print the score after each one, so four lines in total.

Your program reads

A single integer.

Your program prints

Four lines: the score after each of the four compound assignments.

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 score = input.nextInt();

    // Four operators, four printed lines, in order.
  }
}

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

score += 10 is short for score = score + 10. It changes score, it does not just compute a value.

Hint 2

Each operator works on the result of the one before it, so the order matters more than the arithmetic does.

Hint 3

A negative starting score can leave a negative remainder at the end. That is correct Java, not a bug in your code.

Where to go next

Rework the Lesson 1.6 page Pick another Unit 1 lesson

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