Thread: Program due tomorrow. need some advice.

Can someone please help me through this program. It is due tomorrow and i am so lost.
Below is the Assignment itself.
Write a program called FindGrade.java that will perform the following actions:

1. Read lines from a text file in the instructor’s directory named Grades.dat (../instr/Grades.dat) that contains integer grade data for seven students. Each line contains the student number followed by 13 grades for that student. The first ten integers will be program grades; the next two will be test grades; and the thirteenth grade will be the final exam grade. For example, student number 100 might have a line that looked like this:
100 0 20 30 40 55 59 65 80 90 100 95 100 88
This would indicate that student number 100 didn’t submit the first program, made unsatisfactory grades (< 60) on the next five programs, and made grades ranging from 65 to 100 on the last four programs; the student made A’s on the two tests and an 88 on the final exam.

2. Store each line’s data as a row in a 2-D array. Calculate and display the letter grade due each student based on the following rules:

a. The average program grade counts 25%; the first test counts 20%; the second test counts 25%, and the final exam counts 30%.
b. If a student doesn’t complete at least five programs with a grade of 60 or above, his numeric course grade must be lowered by ten points.
c. A calculated course grade should be rounded up to the next integer if its fractional part is > = 0.5 (e.g., 89.5 rounds to 90.0, but 89.4 rounds to 89.0).
d. A course grade of 90 or above is an A, 80 to 89 is a B, 70 to 79 is a C, 60 to 69 is a D, and below 60 is an F.
e. CALCULATION MUST BE DONE IN A METHOD THAT IS CALLED IN YOUR PROGRAM. THE METHOD SHOULD RECEIVE THE GRADES FOR ONE STUDENT (i.e., one row of the table) AND RETURN THE LETTER GRADE FOR THAT STUDENT.

3. Your program should be written so that changing one line of code will allow it to work for a different number of students.
4. All displays should be done in the main, not in called methods. All of your output should be user-friendly, free of spelling errors, and easy to interpret.

I am sooooo lost on how to do this. Any help would be great.

i did start early im just confused on how to do it.

let me copy it and post it. im not trying to make anyone do it for me.

import java.io.*; 
import java.util.*; 
public class GradeCalculator {
 
  public static void main(String args[]) throws IOException
  {
    Scanner sf = new Scanner(new File("grades.dat"));
    int maxIndx = -1; 
    String text[] = new String[1000]; 
    while(sf.hasNext())
    {
      maxIndx++;
      text[maxIndx]=sf.nextLine();
    }
    sf.close();
    String answer="";
    int sum=0;
    double average=0;
    int n=0;
    String a="";
    for(int j=0;j<=maxIndx; j++)
    {
      Scanner sc=new Scanner(text[j]);
      sum=0;
      String s="";
      n=0;
      while(sc.hasNext())
      {
        int i=sc.nextInt();
        sum=sum+i;
        n=n+1;
      }
      average=sum/n;
      System.out.println(average);
    }
  }
}

i am having trouble with the calculating the average. it does calculate the average but it does not do it by the way my instructions say. i need it to take the first 10 and calculate the average for 25%, the next one for 20%, the next one for 25% and the last one as 30%. and then calculate the average.

Thats why i need help. I cant figure out the code to do that for me. arrays for me in general are horrible and are confusing enough.

It would really help to comment your code as well. It would not only help others to understand what you're trying to do with your code, it will help yourself to understand your objective.

I see an int "n" that isn't really doing anything in your code, it's answer will always be the same. Also, you have assigned random strings that aren't doing anything at all. Also, the way you are calculating your average is incorrect, as has already been mentioned.

Judging from the objective of the assignment, you have a pretty long way to go before you get this straightened out.

You know what a 2D array is supposed to look like, right? You are only creating 1 dimensional arrays, so you will never achieve the objective with the way your array is defined.

My advice would be to first figure out how to 2D arrays work, and figure out how to store each student id as a row, and the data for each student in a column. Once you have your array set up, it's just a matter of setting up a calculation for the average of 1 student, and then looping through each row until the end.

In all honesty though, seeing what yo have produced so far, you would need more than a day to wrap your head around this. Good luck.

--- Update ---

oops, I do see n will increase on each pass of the while loop. Still does not come close to calculating a weighted average as the instructor is asking.

Right, but the instructions ask for a 2D array.
"2. Store each line’s data as a row in a 2-D array. Calculate and display the letter grade due each student based on the following rules:"