/import javax.swing.JOptionPane;

public class brandnew

{
    public static void main(String[]args)
    {
       int students;
       int [ ] scores = new int[10];
       String numOfStudents;
       String posNumber;
       String inputOrRandom=null;
       String answer;
      
        numOfStudents = JOptionPane.showInputDialog("How many students in the class?");
        students = Integer.parseInt(numOfStudents);
        
        while(students < 0)
        {
            posNumber = JOptionPane.showInputDialog("Please enter a positive number.");
            students = Integer.parseInt(posNumber);
        }
            if(students > 0)
            inputOrRandom = JOptionPane.showInputDialog("Would you like to input the numbers or have them random generate? (I/R) ");
            
            if(inputOrRandom.equals("I") || inputOrRandom.equals("i"))
             scores = generateUser(students); //System.out.print("xxxx");
                        
            else if
            (inputOrRandom.equals("R") || inputOrRandom.equals("r"))
            System.out.print("RRR"); //generateRandom(students);  //
            
            else
            return;
            
        }

    public static int [] generateUser(int numOfStudents)
    {
        int i=0;
        int [ ] scores = new int[10];
        int grade;
        
       for(int j = 0; j < 10;++j)
            scores[j] = 0;
          
        for(i = 0;i < numOfStudents;i++)
        {
            do
            {
                grade = Integer.parseInt(JOptionPane.showInputDialog(
                    "enter score from 1 to 100 inclusive"));
            }while(grade < 1 || grade >100);
            
            scores[(grade-1)/10]= scores[(grade-1)/10]+1;
            System.out.print(grade + " ");
        }
       System.out.println();
      return scores;
    }
    
    public static void outputHistogram(int [] scores)
    {
             for(int i = 0; i < 10;++i)
             {
                System.out.print((i*10+1)+"-"+(i*10+10)+":");
                for(int x =0; x < scores[i];++x)
                    System.out.print("*");
                
                System.out.println();
             }
            
             return;
    }
}

     else
        return;

     // this one is missing
     outputHistogram(scores);   is missing after

     inputOrRandom = JOptionPane.showInputDialog("Would you like to input the numbers or have them random generate? (I/R) ");
            
      if(inputOrRandom.equalsIgnorecase("I")) {
             scores = generateUser(students);
      }
      else if (inputOrRandom.equalsIgnoreCase("R") ) {
            scores = generateRandom(students);
      }      
      else
            return;
      
      outputHistogram(scores);      

    public static int[] generateRandom(int nbStudends) {
        int[] scores = new int[10];
        Random ran = new Random();
        for(int i = 0; i < nbStudends; i++) {
            double x = ran.nextGaussian() * 100.0;
            int grade = (int) x;
                     scores[(grade-1)/10]++;            
        }
        return scores;
    }

    public static int[] generateRandom(int nbStudends) {
        int[] scores = new int[10];
        Random ran = new Random();
        for(int i = 0; i < nbStudends; i++) {
            int grade = 0;
            while(grade < 1 || grade > 100) {
               double x = ran.nextGaussian() * 100.0;
               grade = (int) x;
            }
                      scores[(grade-1)/10]++;            
        }
        return scores;
    }