Java Array Problem PLEASE Help!

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  • SCOTT DELIBAC
    #1

    Java Array Problem PLEASE Help!

    Can Anyone Help??
    I have this program which is listed below. I want to take the grades that the students have assigned to them, and assign the letter grades a numeric value so that I can calculate their GPA. I just have no idea how I am supposed to do that?? Can anyone HELP!!!

    import javax.swing.*;
    import java.util.*;

    public class GradePoint
    {
    public static void main(String[] args)
    {

    String tempGrades;
    String[][] names = new String[10][6];
    String outputGrades = new String();
    float gpa;
    double A = 4;
    double a = 4;
    double B = 3;
    double b = 3;
    double C = 2;
    double c = 2;
    double D = 1;
    double d = 1;
    double F = 0;
    double f = 0;

    for(int x = 0; x < 3; x++)
    {
    names[x][0] = JOptionPane.sho wInputDialog(nu ll, "Please Enter Student number " + (x + 1) + "s Name ");
    for(int y = 1; y < 6; y++)
    {
    do
    tempGrades = JOptionPane.sho wInputDialog(nu ll, "Please Enter Grade for course number " + (y));
    while (!tempGrades.eq ualsIgnoreCase( "A") && !tempGrades.equ alsIgnoreCase(" B") && !tempGrades.equ alsIgnoreCase(" C") && !tempGrades.equ alsIgnoreCase(" D") && !tempGrades.equ alsIgnoreCase(" F"));
    names[x][y]=tempGrades;
    }

    }
    for(int x = 0; x < 3; x++)
    {
    outputGrades = "Students Name " + names[x][0] + "\n";
    for(int y = 1; y < 6; y++)
    outputGrades += "Grade for course number " + y + ": " + names[x][y] + "\n";
    JOptionPane.sho wMessageDialog( null, outputGrades);
    JOptionPane.sho wMessageDialog( null, names[x][y]);
    JOptionPane.sho wMessageDialog( null, "Grade Report Finished");
    System.exit(0);
    }

    }

    Tags: None
    • Karl von Laudermann
      #2
      Re: Java Array Problem PLEASE Help!

      "SCOTT DELIBAC" <[email protected] phx.edu> wrote in message news:<XGkPb.270 44$Xq2.9730@fed 1read07>...[color=blue]
      > Can Anyone Help??
      > I have this program which is listed below. I want to take the grades
      > that the students have assigned to them, and assign the letter grades a
      > numeric value so that I can calculate their GPA. I just have no idea how
      > I am supposed to do that?? Can anyone HELP!!![/color]

      You can't access the variables A, a, B, b, etc. based on a string.
      Instead, store the grade values in a HashMap:

      HashMap grademap = new HashMap();
      grademap.put("A ", new Integer(4));
      grademap.put("B ", new Integer(3));
      grademap.put("C ", new Integer(2));
      grademap.put("D ", new Integer(1));
      grademap.put("F ", new Integer(0));

      Then you can look up the numeric value based on the grade string:
      int value = grademap.get(na mes[x][y].toUpperCase()) ;

        Comment

        • Karl von Laudermann
          #3
          Re: Java Array Problem PLEASE Help!

          "SCOTT DELIBAC" <[email protected] phx.edu> wrote in message news:<XGkPb.270 44$Xq2.9730@fed 1read07>...[color=blue]
          > Can Anyone Help??
          > I have this program which is listed below. I want to take the grades
          > that the students have assigned to them, and assign the letter grades a
          > numeric value so that I can calculate their GPA. I just have no idea how
          > I am supposed to do that?? Can anyone HELP!!![/color]

          You can't access the variables A, a, B, b, etc. based on a string.
          Instead, store the grade values in a HashMap:

          HashMap grademap = new HashMap();
          grademap.put("A ", new Integer(4));
          grademap.put("B ", new Integer(3));
          grademap.put("C ", new Integer(2));
          grademap.put("D ", new Integer(1));
          grademap.put("F ", new Integer(0));

          Then you can look up the numeric value based on the grade string:
          int value = grademap.get(na mes[x][y].toUpperCase()) ;

            Comment

            • SCOTT DELIBAC
              #4
              Re: Java Array Problem PLEASE Help!

              Thank you I got it.

              -Scott


              --
              Delibac
              "Karl von Laudermann" <[email protected] m> wrote in message
              news:e7e6125e.0 401210759.52501 [email protected] gle.com...[color=blue]
              > "SCOTT DELIBAC" <[email protected] phx.edu> wrote in message[/color]
              news:<XGkPb.270 44$Xq2.9730@fed 1read07>...[color=blue][color=green]
              > > Can Anyone Help??
              > > I have this program which is listed below. I want to take the grades
              > > that the students have assigned to them, and assign the letter grades a
              > > numeric value so that I can calculate their GPA. I just have no idea how
              > > I am supposed to do that?? Can anyone HELP!!![/color]
              >
              > You can't access the variables A, a, B, b, etc. based on a string.
              > Instead, store the grade values in a HashMap:
              >
              > HashMap grademap = new HashMap();
              > grademap.put("A ", new Integer(4));
              > grademap.put("B ", new Integer(3));
              > grademap.put("C ", new Integer(2));
              > grademap.put("D ", new Integer(1));
              > grademap.put("F ", new Integer(0));
              >
              > Then you can look up the numeric value based on the grade string:
              > int value = grademap.get(na mes[x][y].toUpperCase()) ;[/color]


                Comment

                • SCOTT DELIBAC
                  #5
                  Re: Java Array Problem PLEASE Help!

                  Thank you I got it.

                  -Scott


                  --
                  Delibac
                  "Karl von Laudermann" <[email protected] m> wrote in message
                  news:e7e6125e.0 401210759.52501 [email protected] gle.com...[color=blue]
                  > "SCOTT DELIBAC" <[email protected] phx.edu> wrote in message[/color]
                  news:<XGkPb.270 44$Xq2.9730@fed 1read07>...[color=blue][color=green]
                  > > Can Anyone Help??
                  > > I have this program which is listed below. I want to take the grades
                  > > that the students have assigned to them, and assign the letter grades a
                  > > numeric value so that I can calculate their GPA. I just have no idea how
                  > > I am supposed to do that?? Can anyone HELP!!![/color]
                  >
                  > You can't access the variables A, a, B, b, etc. based on a string.
                  > Instead, store the grade values in a HashMap:
                  >
                  > HashMap grademap = new HashMap();
                  > grademap.put("A ", new Integer(4));
                  > grademap.put("B ", new Integer(3));
                  > grademap.put("C ", new Integer(2));
                  > grademap.put("D ", new Integer(1));
                  > grademap.put("F ", new Integer(0));
                  >
                  > Then you can look up the numeric value based on the grade string:
                  > int value = grademap.get(na mes[x][y].toUpperCase()) ;[/color]


                    Comment

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