Thread: Problem with a weigted average code

I am doing a program that has a weighted average calculation and everything compiles and runs. It is just that my weighted average seems to be calculating incorrectly.

This is the type of output I should see:

Homework:
Number of assignments? 3
Assignment 1 score and max? 14 15
Assignment 2 score and max? 16 20
Assignment 3 score and max? 19 25
Sections attended? 4
Total points = 65 / 80
Weighted score = 40.63
Exam 1:
Score? 81
Curve? 0
Total points = 81 / 100
Weighted score = 16.2
Exam 2:
Score? 95
Curve? 10
Total points = 100 / 100
Weighted score = 30.0
Course grade = 86.83

Below is my code and I think even after getting up this morning and looking at it, I have an error in the calculations, but I can;t pinpoint it. Any useful suggestions would be helpful.

//This program is supposed to receive input from user, and calculated the grades of a
//student with a weighted average
 
import java.util.Scanner;
 
public class Grades{
	private double weightExam;
	private double score;
	private double curveAmount;
	private double scoreTotal;
	private double scoreWeighted;
	private double weightHomeWork; 
	private int section;
	private int sections;
	private double sumScore;
	private double number;
	private double assignMax;
	private double assignScore;
	private int sumMax;
 
	Scanner console = new Scanner(System.in);
 
	public Grades() {
		intro();
		exam();
		homework();
	}
	public void intro() {
		System.out.println("This program accepts scores from two exams and");
		System.out.println("scores from your homework as input and computes");
		System.out.println("your grade in the course.");
		System.out.println();
	}
	public void exam() {
		for (int i = 0; i < 2; i++) { // 2 exams
			System.out.print("What is the weight of exam " + i + " (0-100)?");
			weightExam = console.nextInt();
			System.out.print("Score earned?");
			score = console.nextInt();
			System.out.print("Was there a curve (1=yes, 2=no)?");
			int curve = console.nextInt();
			if (curve == 1) {
				System.out.print("How much was the curve?");
				curveAmount = console.nextInt();
			} 
			else {
				curveAmount = 0;
			}
			totalScore();
			weightedScore();
 
			System.out.println("Total points = " + scoreTotal + "/" + "100");
			System.out.println("Weighted score = " + scoreWeighted + "/" + weightExam);
		}
	}
	public void totalScore() {
		scoreTotal = Math.min(score + curveAmount, 100);
	}
	public void weightedScore() {
		scoreWeighted = (score + curveAmount)/200 * weightExam;
	}
	public void homework() {
		System.out.print("What is the Homework weight (0-100)?");
		weightHomeWork = console.nextInt();
		System.out.print("Number of assignments?");
		number = console.nextInt();
 
		for (int i = 0; i < number; i++) {
			System.out.println("Assignment " + i+1 + " score and max?");
			assignScore = console.nextInt();
			assignMax = console.nextInt();
			sumScore += assignScore; 
			sumMax += assignMax; 
		}
		System.out.print("How many sections attended?");
		section = console.nextInt();
		sections = Math.min(3 * section, 20);
		System.out.println("Section points = " + sections);
 
		weightedHomework();
 
		System.out.println("Total points = " + (sections + sumScore) + "/"
				+ sumMax);
		System.out.println("Weighted score = " + scoreWeighted + "/" + weightHomeWork);
	}
	public void weightedHomework() {
		scoreWeighted = ((sections + sumScore)/sumMax)*weightHomeWork;
	}
	public static void main(String[] args) {
		new Grades();
	}
}

We need to understand what you think is wrong or specifically what indications you have that the output is incorrect before we can help.

I apologize, I had it highlighted to copy and paste, then forgot to add it to the post.

Output from the program:


This program accepts scores from two exams and
scores from your homework as input and computes
your grade in the course.

What is the weight of exam 0 (0-100)?20
Score earned?98
Was there a curve (1=yes, 2=no)?1
How much was the curve?5
Total points = 100.0/100
Weighted score = 10.3/20.0
What is the weight of exam 1 (0-100)?30
Score earned?88
Was there a curve (1=yes, 2=no)?1
How much was the curve?10
Total points = 98.0/100
Weighted score = 14.7/30.0
What is the Homework weight (0-100)?50
Number of assignments?3
Assignment 01 score and max?
15 15
Assignment 11 score and max?
19 20
Assignment 21 score and max?
21 25
How many sections attended?
5
Section points = 15
Total points = 70.0/60
Weighted score = 58.333333333333336/50.0

The mathematical formula should be:
((15+19+21+(5x4))/(15+20+25+20))x50 + ((98/100)x20) + ((97/100)x30)

The first parenthetical x 50 is the sum of the actual grades/the max grades for homework x 50% of the total grade. The second and third parenthetical are each and exam and the x20 and x30 is the percentage of the total grade for those exams.

I am afraid I know the mathematical but not the coding replacement for those formulas.

Thank you! I will go back through it and try to restructure the formulas.