AP CSA 2.4 Exercise 1: Ticket Window

Unit 2: Selection and Iteration · Lesson 2.4 · Exercise 1

Ticket Window

Nested if Statements. Write real Java, run it, and submit it to be graded against hidden test cases.

Back to the Lesson 2.4 page All Unit 2 lessons

Why this one is worth doing

Nesting is for decisions that only make sense once an earlier one has been settled. The discount here does not exist for adults at all, so testing for it at the top level would be answering a question nobody asked.

What to write

Read an age as an integer, then a day number where 1 means a weekday and 2 means a weekend.
Under 13 is a child ticket at 8. 13 to 64 is an adult ticket at 14. 65 and over is a senior ticket at 9.
Inside the child case only, a weekend adds 2 to the price.
Inside the senior case only, a weekday takes 3 off the price.
Print the ticket type on the first line and the final price on the second.

Your program reads

Two integers on separate lines: age, then 1 for a weekday or 2 for a weekend.

Your program prints

Two lines: CHILD, ADULT or SENIOR, then the price.

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

10
2

Example 1 output

CHILD
10

Example 2 input

30
1

Example 2 output

ADULT
14

Your answer

Main.java

import java.util.Scanner;

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

    // Decide the type first, then adjust the price inside that branch.
  }
}

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

The day adjustment belongs INSIDE the child branch and INSIDE the senior branch, never beside them. An adult price never moves.

Hint 2

Once you are in the else if, age < 13 is already known to be false, so age < 65 is the whole adult test.

Hint 3

Declaring String type; and int price; before the chain lets every branch assign them and one print at the end read them.

Where to go next

Rework the Lesson 2.4 page Pick another Unit 2 lesson

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