Average grade program

i need help with my array ad parameters i don't know how to fix this program.
This is a program that allows a user to enter class grades into an array of floats. The app will prompt for the total number of grades to be entered, then call a method to average the grades, and display the grades and the resulting average.

This is my code
import javax.swing.JOptionPane;
public class Average {
public static void main(String[]args)
{
String input,amount;
double data[], gradetotal1;
double sum=0,average;

System.out.println("\tAverage Program");
amount=JOptionPane.showInputDialog("Input Number of grades to enter");
gradetotal1=Double.parseDouble(amount);

data[]=gradetotal1;

for (int i=0;i<data.length;i++){
input=JOptionPane.showInputDialog("Enter grades");
data[i]=Double.parseDouble(input);
}
for(int i=0;i<data.length;i++){
sum+=data[i];

average=sum/data.length;

JOptionPane.showMessageDialog(null, "The total is:"+sum+"The Average is:"+average, JOptionPane.INFORMATION_MESSAGE);
}
}

}

Try this, now finding out what I have changed and why is your job :)

Code:

---

import javax.swing.JOptionPane;

public class Average{

        public static void main(String[] args) {
                String input, amount;
                double data[];
                int gradetotal1;
                double sum = 0, average = 0;

                System.out.println("\tAverage Program");
                amount = JOptionPane.showInputDialog("Input Number of grades to enter");
                gradetotal1 = Integer.parseInt(amount);
                data = new double[gradetotal1];

                for (int i = 0; i < data.length; i++) {
                        input = JOptionPane.showInputDialog("Enter grades");
                        data[i] = Double.parseDouble(input);
                }
                for (int i = 0; i < data.length; i++) {
                        sum += data[i];

                        average = sum / data.length;

                }
                JOptionPane.showMessageDialog(null, "The total is: " + sum
                                + " The Average is: " + average, "Result",
                                JOptionPane.INFORMATION_MESSAGE);
        }

}

---

data[] = new double(gradetotal1);
;)

Code:

---

data[] = new double(gradetotal1);

---

:confused: What is that supposed to do?

Just corrected a mistake :D he said data[] = gradetotal1; which is a mistake.

Quote:

---

Originally Posted by cens

data[] = new double(gradetotal1);
;)

---

Quote:

---

Originally Posted by cens

Just corrected a mistake :D he said data[] = gradetotal1; which is a mistake.

---

The correct code (which is in javinpaul's last post) is

Code:

---

double data[];
...
data = new double[gradetotal1];

---

You don't need the [] in the assignment, just in the declaration.