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Thread: Help needed on java array

  1. #1
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    Default Help needed on java array

    I have an assignment on arrays
    On student grades .
    The Program should provide the following.
    1. Allow a user to enter a number of results (a value between 2 & 25)

    2. Process the required number of results by

    Allowing a user to enter a students name
    Allowing a user to enter a students grade (a value between 1 & 100).

    3. When data entry is complete, display a menu with the following options

    Display lowest class grade
    Display highest class grade
    Display average class grade
    Sort & Display the grades in ascending order
    Search for an individual student by name

    Can someone point me in the right direction with this program .
    thanks john


  2. #2
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    Default Re: Help needed on java array

    Hi John

    From what I understand, you just need the following

    1. Implement main method
    2.Accept the number of results , n.
    3.Check whether n is greater than 2 and less than 25
    4. Loop the number of results to enter and accept the grades, in an array, for example.
    5.Print the following options in the screen.

    If you are facing some probs, please put your code forward.

    Cheers,
    wanderer
    (prit4u.wordpress.com)

  3. #3
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    Default Re: Help needed on java array

    This is what i have done so far but when i enter more that 4 students the programs closes down also where would i enter the sort code ?
    public class program {
     
     
            public static void main(String[] args) {
     
     
                // Establishes the rows and columns in the arrays,
                // along with the average grades.
                int students = 0, tests = 0;
                int sum = 0;
                // Establishes an array for student names, test grades and averages, and
                // the final letter grade.
     
               int grade[][] = new int[25][3];
                String student[] = new String[25];
                double low=100;
                double high=0;
                double low1[]={100,100,100} ;
                double high1[]={0,0,0} ;
     
                // This allows to set the number of students and test grades that you can enter.
                System.out.println("Please enter the number of students you want to enter(1-25): ");
                students = EasyIn.getInt();
     
     
                System.out.println("Please enter the number of test  subject grades (1-3): ");
                tests = EasyIn.getInt();
     
                System.out.println();
                // This allows you to enter the student name, and their test grades.
                for( int x = 0; x < students; x++){
                    System.out.println("Student Name: ");
                    student[x] = EasyIn.getString();
     
                    for(int y = 0; y < tests; y++){
                        System.out.println("Test Grade " +(y + 1) +": ");
                        grade[x][y] = EasyIn.getInt();
     
                        if (low1[x] > grade[x][y])
                        {
                            low1[x] = grade[x][y];
                        }
     
                        if (high1[x] < grade[x][y])
                        {
                            high1[x] = grade[x][y];
                        }
     
                        sum += grade[x][y];
     
                        if (grade[x][y] < low)
                            low = grade[x][y];
                        if (grade[x][y] > high)
                            high = grade[x][y];
                    }
     
                    // Determines grade letter from the average score of each student.
                    grade[x][tests] = sum/tests;
     
     
                    sum = 0;
                    System.out.println();
                    }
     
                    // Out
                    System.out.printf("%-10s","Student Name" + "\t");
                    for(int y = 0; y < tests; y++){
                        System.out.printf("%-10s", "Test " + (y + 1));
                    }
                    System.out.println("    Average        Grade  lowest grade");
                    for(int q = 0; q < students; q++){
                        System.out.printf("%-12s", student[q]);
                        for(int w = 0; w < tests; w++){
                            System.out.printf("%10.2f", grade[q][w]);
                        }
                        System.out.printf("%12.2f", grade[q][tests]);
     
                        System.out.printf("%16s", low1[q]);
                        System.out.printf("%13s", high1[q]);
     
                        System.out.println();
     
                    }
    //
     
            String search_name;
                    System.out.printf("Please enter student Name to search for: ");
                    search_name = EasyIn.getString();
                 for(int q = 0; q < students; q++){
                if (student[q].equals(search_name))
                    {
                    System.out.printf("Student Name: %s \n", student[q]);
     
                        for(int r = 0; r < tests; r++)
                        {
                            //System.out.printf("%10.2f", grade[q][r]);
                            System.out.printf("\n Test %d : Mark : %.2f  ",r + 1 , grade[q][r]);
                        }
                        System.out.printf("\n\n Lowest mark by %s in all tests  : %.2f \n Highest mark by %s in all tests %.2f \n",search_name, low1[q],search_name,high1[q]);
                    }
     
     
                      //
                }
                      //
                 System.out.printf("\n\n Lowest overall mark by any student in all tests  : %.2f \n Highest overall mark by any student in all tests %.2f \n",low,high);
    }
            ///
    Last edited by helloworld922; March 7th, 2010 at 02:09 PM.

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