compile error

I have an assignment where the computer should simulate the roll of 3 dice 60000 times,sum the values determine the frequency of the numbers and the percentages.
Problem: when try to compile I get an error message that says modifyArray(int) in lab5 cannot be applied to modifyArray();
Please help,I do not understand the message.
Thank you for your help
Nancy
Here is my code

// Applet that simulates rolling of 3 dice, sum the faces, display the frequency in percentages and total both the 
// frequency and the percentages
import javax.swing.*;
import java.awt.*;
import java.awt.Container;
public class Lab5 extends JApplet {

JTextArea outputArea;
int face,frequency[] = new int[ 19 ];
String output= "";
double percent = 0.00;

public void init() {
    outputArea = new JTextArea();
Container c = getContentPane();
c.add (outputArea);
outputArea.setFont(new Font("Courier", Font.ITALIC, 18));

showArray();
modifyArray();
}
public int rollDice()   {
int die1, die2, die3;

//roll dice 60000 times
for ( int roll= 1; roll <= 60000; roll++) {
    die1 = 1 +(int) ( Math.random()  * 6 );
die2 = 1 +(int) ( Math.random()  * 6 );
    die3 = 1 +(int) ( Math.random()  * 6 );
        
    face = die1+die2+die3;
        }
    // use face value as subscript for frequency array
++frequency[ face ];
return face;
}

public void showArray()  {
    // append frequency to String output
for (face=3; face < frequency.length; face++ ){
output +="\n" + face + "\t" + frequency[face]+ "\t\t" + percent;

outputArea.setText("Sum\tFrequency\t%"+"\n" + output );//+ "\n\n" + "Total");
}
    }
    public void modifyArray(int frequency)   {
   percent =  frequency/600;
  
   
    }
    
}

To answer your specific question, the method signature for modifyArray()
requires an int as an argument, which you don't provide when you call it.
You have a number of other problems. Compare your code to this, to see the
differences (this code does what I think you're trying to do)

import javax.swing.*;
import java.awt.*;
import java.awt.Container;
public class Lab5 extends JApplet
{
  JTextArea outputArea;
  int[]frequency = new int[19];
  String output= "";
  double[] percent = new double[19];
  
  public void init()
  {
    outputArea = new JTextArea();
    Container c = getContentPane();
    c.add (outputArea);
    outputArea.setFont(new Font("Courier", Font.ITALIC, 18));  
    rollDice(); 
    setPercent();
    showResults();
  }
  public void rollDice()
  {
    int die1, die2, die3, face;
    for ( int roll = 1; roll <= 60000; roll++)
    {
      die1 = 1 +(int) ( Math.random()  * 6 );
      die2 = 1 +(int) ( Math.random()  * 6 );
      die3 = 1 +(int) ( Math.random()  * 6 );       
      face = die1+die2+die3;
      ++frequency[ face ];
    }
  }
  
  public void showResults()
  {
    for (int x = 3; x < frequency.length; x++ )
    {
      output +="\n" + x + "\t" + frequency[x]+ "\t\t" + percent[x];      
    }
    outputArea.setText("Sum\tFrequency\t%"+"\n" + output );//+ "\n\n" + "Total");
  }
  public void setPercent()
  {
    for(int x = 3; x < frequency.length; x++) percent[x] =  (double)frequency[x]/600;         
  }    
}

Thank you very much.
I compile it,the frequencies are display, but not the percentages.
Have a question. wcan I add the elements of tan array?
Thank you
Nancy

The percentages showed OK for me.
Your question, adding the elements of an array? Loop through the array
adding the value at each element.

Thank you for your help. I got it
Another question. I need to add the % sign to the percentages, but it only displays on the las number Wahat did I do wrong?
Thank you
Nancy
[ edited to break apart long lines -ds ]
[ March 16, 2004: Message edited by: Dirk Schreckmann ]

Nancy,
Welcome to JavaRanch!
We ain't got many rules 'round these parts, but we do got one. Please change your display name to comply with The JavaRanch Naming Policy.
Thanks Pardner! Hope to see you 'round the Ranch!

nother question. I need to add the % sign to the percentages, but it only displays on the las number Wahat did I do wrong?
Perhaps you want to add a few percent signs to be output during the execution of your for-loop. (In other words, look inside your for-loop. It's not displaying any percent signs.)

I already tried. Right after twoD.format(percent[x]), but then the applet never display any result at all.
Thanks for your help
Nancy

Thank you very much for all your help.
I was placing the % sign inside the parenthesis by mistake. That is why it did not work.
Thank you again
Nancy