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  1. #1
    Join Date
    Dec 2005
    Posts
    4

    java help

    I'm at college and i'm new to java, i'm currently creating the following program.

    The problem is if i assign the array with a number it works fine but if i define it with a letter that will hold a number it gets error

    The reason i placed a letter was so that the array isn't a fixed value so they could enter as many students as they want by typing it in via the D in the StudentID array hope thats sounds right

    Code with the Array numbers defined this one works

    //Program for Assignment of Software Development
    //Richard Meredith

    PHP Code:
    import java.util.*;

    public class 
    Assigns

    {
        
    //public static int D ;
        
    public static String studentID[] = new String[2];        
        public static 
    int marks[][] = new int[10][8];            
        public static 
    Scanner kybd = new Scanner(System.in);        
        public static 
    String response;        
        public static 
    int Total 0;
        public static 
    int FinalTotal[] = new int[2];
        



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

                    
            public static 
    void menu()                        // Entry function
            
    {

            
    int input;
            
    System.out.println("   Please select an option\n");
            
    System.out.println("1. Enter Student ID and Exam marks");
            
    System.out.println("2. Display current Data");
            
    System.out.println("3. Display Total marks");
            
    System.out.println("4. Dislay Grades");
            
    System.out.println("5. Save Data");
                
            
    input kybd.nextInt();

                switch(
    input)
                {
                    case 
    1:

                    {    
                        
                        
    GetID();
                    }
                
                    case 
    2:
                    
                    {
                        
    Display();            
                    }

                    case 
    3:
                    
                    {
                        
    //Stats        
                    
    }
                    
                    case 
    4:
                    
                    {
                           
    //Modify            
                    
    }

                    case 
    5:
                    
                    {
                          
    //Search                            
                    
    }
                    case 
    6:
                    {
                         
    //Save
                    
    }

                    case 
    7:
                    {
                        
    //Quit
                    
    }
                }



            }


            public static 
    void GetID()    
            {    


            for (
    int c 02;c++)
            {
                    
            
    System.out.println("Please Enter the student ID");
            
    studentID[c] = kybd.next();

            
    System.out.println("Please enter the eight exams marks");
        for (
    int a 08; ++a
        {
            
    System.out.println("Enter mark" " " +( 1) + " ");
            
    marks[c][a] = kybd.nextInt();
        
                     if (
    marks[c][a] > 20)
            {
              
    System.out.println("Entry out of score limit");
              
    ;
              
    ;
              
    System.out.println("Enter mark" " " +( 1) + " ");
              
    marks[c][a] = kybd.nextInt();
            }
            else
            if(
    marks[c][a] < -1)
            {
             
    System.out.println("Entry out of score limit");
            
    ;
            
    ;
            
    System.out.println("Enter mark" " " +( 1) + " ");
            
    marks[c][a] = kybd.nextInt();
            }
        }
                    
        }
                
                
                
        }



        public static 
    void Display()
        {
            
    //System.out.println("\nStudentID   1  2  3  4  5  6  7  8  %  Grade");

                
    for (int c 02c++)
                { 
                    
                
    System.out.print("\n"studentID[c] + " ");
                
                for (
    int a 08; ++a)
                {
                
    System.out.print("  " marks[c][a] + " ");
                }
                
    MarksTotal(c);
                
    Grade();
                }
                
                
                
                
            }            


            public static 
    void MarksTotal(int c)
            {
            for (
    02; ++c)            
            {
                
    Total 0;
                for (
    int a 08; ++a
                {
                    if (
    marks[c][a] > -1)
                    {
                              
    Total Total marks[c][a];         
                    
    FinalTotal[c] = Total;
                    }
                    
                }
                

            }
                
    System.out.print(Total);        
            }
            

            public static 
    void Grade()
            {
                if (
    Total 70)
                {
                    
    System.out.print(" Distiniction");
                }
                if (
    Total <=70 && Total 60)
                {
                    
    System.out.print(" Merit");
                }
                if (
    Total 40 && Total <= 60)
                {
                    
    System.out.print(" Pass");
                }
                if (
    Total <= 40)
                {
                    
    System.out.print(" Fail");
                }
            }
        public static 
    void SaveFile()
        {

            
    //Save to file
        
    }

        public static 
    void LoadFile()
        {

        }
    }            

    CODE WITH ARRAY LETTER INSTEAD OF NUMBER THIS DOESN'T WORK

    //Program for Assignment of Software Development
    //Richard Meredith

    import java.util.*;

    public class Assigns

    {
        public static int D ;
        public static String studentID[] = new String[D];        
        public static int marks[][] = new int[10][8];            
        public static Scanner kybd = new Scanner(System.in);        
        public static String response;        
        public static int Total = 0;
        public static int FinalTotal[] = new int[D];
        



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

                    
            public static void menu()                        // Entry function
            {

            int input;
            System.out.println("   Please select an option\n");
            System.out.println("1. Enter Student ID and Exam marks");
            System.out.println("2. Display current Data");
            System.out.println("3. Display Total marks");
            System.out.println("4. Dislay Grades");
            System.out.println("5. Save Data");
                
            input = kybd.nextInt();

                switch(input)
                {
                    case 1:

                    {    
                        
                        GetID();
                    }
                
                    case 2:
                    
                    {
                        Display();            
                    }

                    case 3:
                    
                    {
                        //Stats        
                    }
                    
                    case 4:
                    
                    {
                           //Modify            
                    }

                    case 5:
                    
                    {
                          //Search                            
                    }
                    case 6:
                    {
                         //Save
                    }

                    case 7:
                    {
                        //Quit
                    }
                }



            }


            public static void GetID()    
            {    
            System.out.println("please enter number of students");
            D = kybd.nextInt();

            for (int c = 0; c < D;c++)
            {
                    
            System.out.println("Please Enter the student ID");
            studentID[c] = kybd.next();

            System.out.println("Please enter the eight exams marks");
        for (int a = 0; a < 8; ++a) 
        {
            System.out.println("Enter mark" + " " +( a + 1) + " ");
            marks[c][a] = kybd.nextInt();
        
                     if (marks[c][a] > 20)
            {
              System.out.println("Entry out of score limit");
              a = a ;
              c = c ;
              System.out.println("Enter mark" + " " +( a + 1) + " ");
              marks[c][a] = kybd.nextInt();
            }
            else
            if(marks[c][a] < -1)
            {
             System.out.println("Entry out of score limit");
            a = a ;
            c = c ;
            System.out.println("Enter mark" + " " +( a + 1) + " ");
            marks[c][a] = kybd.nextInt();
            }
        }
                    
        }
                
                
                
        }



        public static void Display()
        {
            
    //System.out.println("\nStudentID   1  2  3  4  5  6  7  8  %  Grade");

                for (int c = 0; c < D; c++)
                { 
                    
                System.out.print("\n"+ studentID[c] + " ");
                
                for (int a = 0; a < 8; ++a)
                {
                System.out.print("  " + marks[c][a] + " ");
                }
                MarksTotal(c);
                Grade();
                }
                
                
                
                
            }            


            public static void MarksTotal(int c)
            {
            for (c = 0; c < D; ++c)            
            {
                Total = 0;
                for (int a = 0; a < 8; ++a) 
                {
                    if (marks[c][a] > -1)
                    {
                              Total = Total + marks[c][a];         
                    FinalTotal[c] = Total;
                    }
                    
                }
                

            }
                System.out.print(Total);        
            }
            

            public static void Grade()
            {
                if (Total > 70)
                {
                    System.out.print(" Distiniction");
                }
                if (Total <=70 && Total > 60)
                {
                    System.out.print(" Merit");
                }
                if (Total > 40 && Total <= 60)
                {
                    System.out.print(" Pass");
                }
                if (Total <= 40)
                {
                    System.out.print(" Fail");
                }
            }
        public static void SaveFile()
        {

            //Save to file
        }

        public static void LoadFile()
        {

        }
    }


    Can anyone point me in the right direction 
    Last edited by Rico3k; 12-05-2005 at 07:00 AM.

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