AP CSA 1.3 Exercise 1: Five Operators

Unit 1: Using Objects and Methods · Lesson 1.3 · Exercise 1

Five Operators

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

Back to the Lesson 1.3 page All Unit 1 lessons

Why this one is worth doing

Integer division and the remainder operator are the two the exam tests hardest, because they are the two that do not behave the way arithmetic class taught you.

What to write

Read two integers, a and b. You may assume b is not zero.
Print a + b, then a - b, then a * b, then a / b, then a % b.
Each result goes on its own line, in that order.

Your program reads

Two integers on separate lines: a, then b.

Your program prints

Five lines: the sum, the difference, the product, the quotient and the remainder.

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

17
5

Example 1 output

Example 2 input

9
3

Example 2 output

Your answer

Main.java

import java.util.Scanner;

public class Main {
  public static void main(String[] args) {
    // Reading input is Lesson 1.4. It is written for you here.
    Scanner input = new Scanner(System.in);
    int a = input.nextInt();
    int b = input.nextInt();

    // Five lines, in the order given.
  }
}

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

int / int throws away the fraction rather than rounding. 7 / 2 is 3, and 4 / 9 is 0.

Hint 2

a % b is what is left over after the division. 4 % 9 is 4, because 9 goes into 4 zero times with 4 left.

Hint 3

When a is negative Java keeps the sign of a in the remainder, so -7 % 3 is -1.

Where to go next

Rework the Lesson 1.3 page Pick another Unit 1 lesson

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