AP CSA 1.2 Exercise 1: Snack Bar Order

Unit 1: Using Objects and Methods · Lesson 1.2 · Exercise 1

Snack Bar Order

Variables and Data Types. Write real Java, run it, and submit it to be graded against hidden test cases.

Back to the Lesson 1.2 page All Unit 1 lessons

Why this one is worth doing

Three types, three jobs. Picking int where you needed double is the single most common way a correct-looking program prints the wrong number.

What to write

Read a snack name (one word), then a whole number of them, then the price of one as a decimal.
Store each in a variable of the right type: String, int, double.
Print the name, then the count, then the unit price, each on its own line.
Print the total cost on the fourth line.

Your program reads

A word, then an integer, then a decimal number, each on its own line.

Your program prints

Four lines: the snack name, the count, the unit price, and the total cost.

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

pretzel
3
2.5

Example 1 output

pretzel
3
2.5
7.5

Example 2 input

water
1
1.25

Example 2 output

water
1
1.25
1.25

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);
    String snack = input.next();
    int count = input.nextInt();
    double price = input.nextDouble();

    // Print the four lines. Think about which type the total has to be.
  }
}

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

A count of items is a whole number, so it is an int. A price is not, so it is a double.

Hint 2

An int times a double is a double in Java. Store the total in a double or you will lose the cents.

Hint 3

Printing a double always shows a decimal point: 6 prints as 6, but 6.0 prints as 6.0.

Where to go next

Rework the Lesson 1.2 page Pick another Unit 1 lesson

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