AP CSA 1.4 Exercise 1: Locker Assignment

Unit 1: Using Objects and Methods · Lesson 1.4 · Exercise 1

Locker Assignment

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

Back to the Lesson 1.4 page All Unit 1 lessons

Why this one is worth doing

This is the first exercise where you write the Scanner yourself. The order you call next, nextInt and nextDouble in has to match the order the values arrive in, and nothing warns you when it does not.

What to write

Create a Scanner that reads from System.in.
Read a student first name (one word), then a locker number as an int, then a shelf height in metres as a double.
Print the name, then the locker number, then the height, each on its own line.
Print the locker number again on the fourth line, this time plus 100, which is what the second floor uses.

Your program reads

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

Your program prints

Four lines: the name, the locker number, the shelf height and the second floor locker number.

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

Maya
214
1.5

Example 1 output

Maya
214
1.5
314

Example 2 input

Devon
7
0.75

Example 2 output

Devon
7
0.75
107

Your answer

Main.java

import java.util.Scanner;

public class Main {
  public static void main(String[] args) {
    // Create the Scanner, read the three values, print the four lines.
  }
}

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 import is already at the top. You still need Scanner input = new Scanner(System.in);

Hint 2

next() reads one word, nextInt() reads a whole number, nextDouble() reads a decimal. Call them in the order the values arrive.

Hint 3

Calling nextInt() when the next value is a word throws InputMismatchException. If you see that, your reads are out of order.

Where to go next

Rework the Lesson 1.4 page Pick another Unit 1 lesson

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