CS 163/164, Spring 2019

Programming Assignment - P2

Strange Formulas

Due Monday, Feb. 4th at 6:00pm

Late - Tuesday, Feb. 5th at 8:00am

Objectives of this Assignment

1. To write a Java program to implement formulas,
2. to learn how to read input from the user via the console,
3. to declare variables and use them in expressions, and
4. to learn about printing formatted output to the console.
5. to learn that you can implement a formula that you are not familiar with.

Instructions

Write a Java program file called P2.java with a class name P2, an example of the code is shown below. All of the Java code you write should be contained in the main method. For this assignment, you must follow the directions below exactly:

• Create a project in Eclipse called P2.
• Create a class in the project called P2.
• Let Eclipse create a main method in P2.java.
• Copy the comment block below and personalize it
All variables and code should reside in the main method!
• Declare variables named alphaAcid, ounces, weight, lovibond, and volume of type double.
• Create a Scanner object to read console input, as shown in the code below.
• Prompt the user for an Alpha Acid %, by printing "Alpha Acid? " using System.out.print().
• Read the number entered by the user into the alphaAcid variable using the Scanner method nextDouble().
• Prompt the user for a weight in ounces, by printing "Ounces? " using System.out.print().
• Read the number entered by the user into the ounces variable using the Scanner method nextDouble().
• Compute the HBUs based on the following formula: HBUs = alphaAcid * ounces.
• Print the HBUs to the console using System.out.printf(), with 2 digits after the decimal point.
• As before, prompt the user for a values for the remaining 3 variables using System.out.print() (see below for exact prompts to use!).
• Read the numbers entered by the user into the appropriate variables using the Scanner method nextDouble().
• Compute the SRM using Mosher's formula:

• SRM = (0.3 * weight * lovibond / volume) + 4.7

• Remember to use the volume variable here and not the ounces variable from before!
• Print the SRM value to the console using System.out.printf(), with 4 digits after the decimal point.
• The sample output below shows the desired format.

Program Structure

// P2 Assignment Solution
// Author: Ms. White
// Date:   8/27/2018
// Class:  CS163/164
// Email:  white@colostate.edu

import java.util.Scanner;

public class P2 {

    public static void main(String[] args) {

        // Declare variables for mysterious formulas

        // Instantiate scanner
        Scanner keyboard = new Scanner(System.in);

        // Prompt and read alphaAcid from keyboard
        
        // Prompt and read ounces from keyboard
        
        // Calculate HBUs

        // Print HBUs to console

        // Prompt and read remaining variables
        
        // Compute the SRM value using the formula
        
        // Print SRM to console

        // Close scanner
        keyboard.close();
    }
}

Sample Output

Your program should print 7 lines, as below. The user input is shown in blue.

Alpha Acid? 5.0
Ounces? 2.0
The HBUs are 10.00.
Weight? 1.0
Lovibond? 80.0
Volume? 5.0
The SRM value is 9.5000.

Specifications

• Work on your own, as always.
• The name of the source code file must be exactly

   P2.java 

• Name the file exactly - upper and lower case matters!
• Comments at the top as shown above.
• Assignments should be implemented using Eclipse.
• Assignments should be implemented using Java, version 1.8.
• Make sure your code runs on machines in the CSB 120 lab.
• Turn in through the Checkin tab.
• Read the syllabus for the late policy.
• We will be checking programs for plagiarism, so please don't copy from anyone else.

Grading Criteria

• 100 points for perfect submission.
• 0 points for no submission, will not compile, submitted class file, etc.
• Preliminary Tests
  Preliminary tests use the values above for all inputs.
  • testCompile: checks that program compiles. (0 points)
  • test1: checks first line of output with the prompt and Alpha Acid % entered by user. (10 points)
  • test2: checks second line of output with the prompt and Ounces entered by user. (10 points)
  • test3: checks third line of output with the HBUs. (10 points)
  • test4: checks fourth line of output with the prompt and Weight entered by user. (10 points)
  • test5: checks fifth line of output with the prompt and Lovibond entered by user. (10 points)
  • test6: checks sixth line of output with the prompt and Volume entered by user. (10 points)
  • test7: checks seventh line of output with the SRM value. (10 points)
• Final Tests
  Final tests use arbitrary values for all inputs.
  • test6: checks third line of output with the HBUs. (10 points)
  • test7: checks Last line of output with the SRM value. (10 points)
  • test8: checks third line of output with the HBUs for different input. (5 points)
  • test9: checks Last line of output with the SRM value for different input. (5 points)
  • Final grading includes the preliminary tests.

---