AP CSA 1.2 FRQ Practice: Concert Inventory

Unit 1: Using Objects and Methods · Lesson 1.2 · FRQ Practice

Concert Inventory

A free response question in the shape the exam uses: a stated contract, four rubric parts, and no main method handed to you. Worth 4 points.

Back to the Lesson 1.2 pageAll Unit 1 lessons

Why this question is worth four points

The exam does not ask you to name a data type. It asks you to compute something, and then scores whether the type you chose held the answer. An int that should have been a double loses the fraction silently, and a boolean printed as text is the only way to show a yes or no answer before selection is taught.

What you are given

Three variables are declared and assigned for you: int seats, int sold and double price.

The question

  1. (a) Print the number of seats still unsold, as an int.
  2. (b) Print the total revenue from the seats sold, as a double.
  3. (c) Print the revenue that the remaining seats would add if they all sold.
  4. (d) Print a boolean: true when the show is completely sold out.

What the reader is looking for

  1. Write a code segment that prints four lines in rubric order.
  2. Part (b) and part (c) are money. They must print with a decimal point, which means the expression has to be a double and not an int.
  3. Part (d) has no if statement. A comparison IS a boolean value, so you can print the comparison itself.

Worked examples

These show what a correct answer prints. There are more cases you cannot see, and they use different values, so an answer built around just these numbers will fail.

Example 1 is given
int seats = 200;
int sold = 150;
double price = 12.5;
Example 1 output
50
1875.0
625.0
false
Example 2 is given
int seats = 80;
int sold = 80;
double price = 30.0;
Example 2 output
0
2400.0
0.0
true

Your answer

Main.java

Input for the Run button

How this is scored: your answer runs against every test case, and the fraction it passes becomes your score out of 4. That is not how a human AP reader marks a rubric, so treat the score as a check on whether your code works, and the rubric above as the thing you are actually practising.


  

  
Stuck?

    
Hint 1
An int times a double is a double, so sold * price already prints with a decimal point. You do not need a cast and you should not store it in an int.

    
Hint 2
Part (d) does not need an if. System.out.println(unsold == 0) prints the words true or false, which is what the question asks for.

    
Hint 3
Compute unsold once. Parts (a), (c) and (d) all depend on it, and three separate subtractions is three chances to write one of them backwards.



  
Where to go next

  

    Rework the Lesson 1.2 page
    Try the from-scratch exercise for this lesson
    Try the debugging exercise for this lesson
  


  
  






  

















  
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