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Thread: HELP! Confused at why I'm not getting output

  1. #1
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    Question HELP! Confused at why I'm not getting output

    I'm fairly new to the java language but I can't seem to get my code to work. It is supposed to read an input file with names and 10 quiz scores for each person, then do a bubble sort until we have the top 8 scores, then create an average of those scores and give it a letter grade. The final output for each person is supposed to look like this:

    Name: blah - Grade: B

    The input file looks like this

    Bill Brasky
    81
    82
    98
    74
    76
    91
    88
    82
    92
    87
    next name
    and so on

    Here's what my code looks like:



    import java.io.*;
     
    public class StudentGrades
    {
    	public static void main(String args[]) throws Exception
    	{
    		String LETTER;
    		final int SIZE = 10;		// Number of quizzes
    		double score[] = new double[SIZE];   // Array used to store 10 quiz scores.
    		String stuName;			// Used to store name.
    		int x;
    		x = 0;
    		final int LIMIT = SIZE;
    		String stuScoreString;		// used to store what is read before changing to integer.
    		int stuScore = 0; 
    		int pairsToCompare;
    		double gradeAvg;
    		gradeAvg = 0;
    		boolean switchOccurred;
    		boolean done;
    		double temp;
    		double totalGrade;
    		totalGrade = 0;
    		int y;
    		y = 0;
    		System.out.println("Student Grade Report by Russ Penning");
     
    		// Start the input read.
    		FileReader fr = new FileReader("scores.dat");
    		BufferedReader br = new BufferedReader(fr);
     
    		// This is the work done in the fillArray() method
    		while((stuName = br.readLine()) != null)  // Use to read only the first line of the array before change to integer.
    		{
    			x = 0;
    			done = false;
    			while(x < LIMIT)   
    			{		
    			// Place value in array.
    			stuScoreString = br.readLine();
    			// Convert String to integer.
    			stuScore = Integer.parseInt(stuScoreString);		
    			score[x] = stuScore;
    			x++;    // Get ready for next input item.
     
    			}  // End of input loop.
    			stuScore = x - 2;
    			pairsToCompare = stuScore - 1;
     
    			// This is the work done in the sortArray() method
    			switchOccurred = true; // set flag to true
     
    			while(switchOccurred == true)
    			{
    			x = 0;
    			switchOccurred = false;
    				while(x < pairsToCompare)
    				{
    					if(score[x] > score[x + 1])
    					{
    					temp = score[x + 1];
    					score[x+1] = score[x];
    					score[x] = temp;
    					switchOccurred = true;
    				}
    				x++;	
    				}
    				pairsToCompare--;
    				}
    				while(x < stuScore)
    				{
    			        totalGrade = (score[x+2] + totalGrade);
    				x++;
    				}
    				gradeAvg = totalGrade / 8;
     
    				// Call calculateGrades method here		
    				LETTER = calculateGrades(gradeAvg);
    		}	
    		x = 0;
    		while(x < y)
    		{
    		LETTER = "";
    		System.out.println("Name: " + stuName + " -  Grade: " + LETTER);
    		x++;
    		}	
     
    		br.close();
    		System.exit(0);
     
    	} // End of main() method.
     
    	// Write calculateGrades method here.
    	public static String calculateGrades(double gradeAvg)
    	{
     
    		String LETTER;
     
    		if(gradeAvg >= 90)
    			LETTER = "A";
    		else if (gradeAvg >= 80)
    			LETTER = "B";
    		else if (gradeAvg >= 70)
    			LETTER = "C";
    		else if (gradeAvg >= 60)
    			LETTER = "D";
    		else
    			LETTER = "F";
     
    		return LETTER;
    	}
     
    } // End of StudentGrades class.

    Please let me know if anyone can think of anything. I am confused about it.


  2. #2
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    Default Re: HELP! Confused at why I'm not getting output

    Hi, what are you confusing about? Aren't you the owner of the code?

    java exception
    Last edited by hns1984; January 11th, 2012 at 06:56 PM.

  3. #3
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    Default Re: HELP! Confused at why I'm not getting output

    Most of the code is taken from a previous program I worked on that worked perfectly fine. The only addition was calculating the average and creating a letter grade. There shouldn't be an issue with getting the correct output, but for some reason the only thing I'm getting on the report is the title.

  4. #4
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    Default Re: HELP! Confused at why I'm not getting output

    I have got it to give some sort of output, but now all it does it print the first name 1 time, second name 2 times and so on.

    Student Grade Report by Russ Penning

    Name: Billy Bob - Grade:
    Name: Ma Reynolds - Grade:
    Name: Ma Reynolds - Grade:
    Name: Pa Reynolds - Grade:
    Name: Pa Reynolds - Grade:
    Name: Pa Reynolds - Grade:
    Name: Sue Anne - Grade:
    Name: Sue Anne - Grade:
    Name: Sue Anne - Grade:
    Name: Sue Anne - Grade:
    Name: Uncle Mortimer - Grade:
    Name: Uncle Mortimer - Grade:
    Name: Uncle Mortimer - Grade:
    Name: Uncle Mortimer - Grade:
    Name: Uncle Mortimer - Grade:

    I'm still not getting anything back from the called method. Updated code:

    import java.io.*;
     
    public class StudentGrades
    {
    	public static void main(String args[]) throws Exception
    	{
    		String LETTER;
    		final int SIZE = 10;		// Number of quizzes
    		double score[] = new double[SIZE];   // Array used to store 10 quiz scores.
    		String stuName;			// Used to store name.
    		int x;
    		x = 0;
    		final int LIMIT = SIZE;
    		String stuScoreString;		// used to store what is read before changing to integer.
    		int stuScore = 0; 
    		int pairsToCompare;
    		boolean switchOccurred;
    		boolean done;
    		double temp;
    		double totalGrade;
    		totalGrade = 0;
    		int y;
    		y = 0;
    		System.out.println("Student Grade Report by Russ Penning");
    		System.out.println();
     
    		// Start the input read.
    		FileReader fr = new FileReader("scores.dat");
    		BufferedReader br = new BufferedReader(fr);
     
    		// This is the work done in the fillArray() method
    		while((stuName = br.readLine()) != null)  // Use to read only the first line of the array before change to integer.
    		{
    				y++;
    				x = 0;
    				done = false;
    				while(x < LIMIT)   
    				{		
    					// Place value in array.
    					stuScoreString = br.readLine();
    					// Convert String to integer.
    					stuScore = Integer.parseInt(stuScoreString);		
    					score[x] = stuScore;
    					x++;    // Get ready for next input item.
     
    				}  // End of input loop.
    				stuScore = x - 2;
    				pairsToCompare = stuScore - 1;
     
    				// This is the work done in the sortArray() method
    				switchOccurred = true; // set flag to true
     
    				while(switchOccurred == true)
    				{
    					x = 0;
    					switchOccurred = false;
    						while(x < pairsToCompare)
    						{
    							if(score[x] > score[x + 1])
    							{
    								temp = score[x + 1];
    								score[x+1] = score[x];
    								score[x] = temp;
    								switchOccurred = true;
    							}
    							x++;	
    						}
    						pairsToCompare--;
    					}
     
    				while(x < 8)
    				{
    					totalGrade = (score[x] + totalGrade);
    					x++;
    				}
     
    		// Call calculateGrades method here		
    		LETTER = calculateGrades(totalGrade);
     
    		x = 0;
    		while(x < y)
    		{
    			LETTER = "";
    			System.out.println("Name: " + stuName + " - Grade: " + LETTER);
    			x++;
    		}	
    		}
    		br.close();
    		System.exit(0);
     
    	} // End of main() method.
     
    	// Write calculateGrades method here.
    	public static String calculateGrades(double totalGrade)
    	{
     
    		String letterGrade;		
    		double gradeAvg;
    		gradeAvg = (totalGrade/8);
     
     
    		if(gradeAvg >= 90)
    			letterGrade = "A";
    		else if (gradeAvg >= 80)
    			letterGrade = "B";
    		else if (gradeAvg >= 70)
    			letterGrade = "C";
    		else if (gradeAvg >= 60)
    			letterGrade = "D";
    		else
    			letterGrade = "F";
     
    		return letterGrade;

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