Calculation returning 0.0 in Java

Question

This is a program for my Java class. My calculation for the weighted scores on the exams are 0.0. How do I stop it from calculating 0.0 and return the correct amount? I think it's an issue with double/int, but I don't know where the problem is. The method for the exams is at the bottom of my code.

Thanks

//This program calculates grades
import java.util.*;

public class Grades {
  public static Scanner console = new Scanner(System.in);
  public static int assignmentScore = 0;
  public static int assignmentMax = 0;


  public static void main (String[] args) {
  giveIntro();

  System.out.print("Homework and Exam 1 weights? ");
  int homeworkWeight = console.nextInt();
  int exam1Weight = console.nextInt();
  int exam2Weight = 100 - homeworkWeight - exam1Weight;
  System.out.print("Using weights of " + homeworkWeight + " " + exam1Weight + " " + exam2Weight);

  System.out.println();   
  System.out.println();
  System.out.println("Homework:");


  System.out.print("Number of assignments? ");
  int numberOfAssignments = console.nextInt();
  assignments(numberOfAssignments);

  System.out.print("Sections attended? ");
  int sectionsAttended = console.nextInt();
  double weightedHomeworkScore = homework(sectionsAttended, homeworkWeight);

  System.out.println();
  System.out.println("Exam 1:");
  double weightedExam1Score = exam(exam1Weight);
  System.out.println();

  System.out.println("Exam 2:");
  double weightedExam2Score = exam(exam2Weight);
  System.out.println();

  double courseGrade = (double)weightedHomeworkScore + weightedExam1Score + weightedExam2Score;
  System.out.println("Course grade = " + round2(courseGrade));
  }

   //Returns the given double value rounded to the nearest hundredth.
   public static double round2(double number) {
      return Math.round(number * 100.0) / 100.0;
      }

   //Outputs introduction
   public static void giveIntro () {
      System.out.println("This program accepts your homework scores and");
      System.out.println("scores from two exams as input and computes");
      System.out.println("your grade in the course.");
      System.out.println();
      }

   //Returns the weighted score
   public static double weightedScore(double i, double j, double k) {
      return (i / j) * k;
   }

   //Takes the number of assignments input and asks for the score and max of each assignment
   public static void assignments(int number) {
      for (int i = 1; i <= number; i++) {
         System.out.print("Assignment " + i + " score and max? ");
         assignmentScore = assignmentScore + console.nextInt();
         assignmentMax = assignmentMax + console.nextInt();
      }
   }

   //Takes the sections attended and homework weight, then returns the weighted homework score
   public static double homework(int i, int j) {
      int totalEarnedPoints = assignmentScore + (i * 4);
      int totalPoints = assignmentMax + 20;
      System.out.println("Total points = " + totalEarnedPoints + " / " + totalPoints);
      double weightedHomeworkScore = weightedScore(totalEarnedPoints, totalPoints, j);
      System.out.println("Weighted score = " + round2(weightedHomeworkScore));   
      return weightedHomeworkScore;
   }

   //Takes the exam weight, receives score and curve input, then returns the weighted scores for exams
   public static double exam(int examWeight) {
      double weightedExamScore = 0;
      System.out.print("Score? ");
      int examScore = console.nextInt();

      System.out.print("Curve? ");
      int examCurve = console.nextInt();
      int examCurvedPoints = Math.min(examScore + examCurve, 100);

      System.out.println("Total points = " + examCurvedPoints + " / 100");
      System.out.println("Weighted score = " + round2(weightedExamScore));
      return weightedExamScore = weightedScore(examCurvedPoints, 100, examWeight);
   }
}

Answer 1

First you do this:

  double weightedExamScore = 0;

Then you do this:

  System.out.println("Weighted score = " + round2(weightedExamScore));

And then you do this:

  return weightedExamScore = weightedScore(examCurvedPoints, 100, examWeight);

There is nothing that modifies weightedExamScore between its initialisation with zero and the line where you print it out.

It will be zero.

Are you sure you don't want to calculate weightedExamScore before you print it out?