double[] primeNums = {2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97};

for (int scan = 0; scan < primeNums.length; scan++) // scans array of primeNums[]
					{
						if (d == primeNums[scan]) prime = "Prime"; // if it finds a prime
						else prime = "Composite"; // if it doesnt find a prime
						if ( ( d % 2 ) != 0) prime = "Prime"; // if the number is a decimal

/**
 * @(#)numbergame.java
 *
 * numbergame application
 *
 * @Kevin Ryan 
 * @version 1.00 2008/9/5
 */
import javax.swing.*;
import java.util.*;
import java.awt.*;
import java.awt.event.*;
import java.lang.String;
public class numbergame 
{
    public static void main(String[] args) 
    	{
    		int play, error = 0, playagain; // declares play and error which prompt the start box and whether or not there were errors
    		double[] primeNums = {2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97};
    		String s2 = "0", s = "0", even = "", prime = ""; // declares strings for prime, even, and the input string before and after trim
    		double d = 0 , squareroot, squared; // declares double for d which is the value holder, squareroot, and squared.
    			
    			play = JOptionPane.showConfirmDialog (null,"Would you like to play a game?"); // prompts to start game
    				if (play == JOptionPane.YES_OPTION) // if the user presses yes
    				if (play == JOptionPane.CANCEL_OPTION)
    					System.exit(0);
    				if (play == JOptionPane.NO_OPTION)
    					System.exit(0);
    			do{
    				{
    	 				s = JOptionPane.showInputDialog ("Enter a number between 1 and 100\nand click ok"); // input box
    	 				s2 = s.trim(); // trims answer
    				}
    					
    			try {
    					d = Double.parseDouble(s2); // tries to parse into a double
					}
						catch(NumberFormatException ex) // if it can't parse it
							{
								error = 1; // throws an error
								JOptionPane.showMessageDialog(null, "You entered an invalid value.\nSystem Critical!\nShuting down...", "!!!", JOptionPane.ERROR_MESSAGE); // tells them they entered an invalid value
								if (error == 1) System.exit(0); // closes program if errors == 1
							}
				if (d < 0 || d > 100) JOptionPane.showMessageDialog(null, "You entered a value that is out of range.\nSystem Critical!\nShuting down...", "!!!", JOptionPane.ERROR_MESSAGE); // if the number is too big
				if (d < 0 || d > 100) System.exit(0); // if the number is too big
 				if ( ( d % 2 ) == 0) even = "even"; // if its even
    			if ( ( d % 2 ) != 0) even = "odd"; // if its odd
				
				for (int scan = 0; scan < primeNums.length; scan++) // scans array of primeNums[]
					{
						if (d == primeNums[scan]) prime = "Prime"; // if it finds a prime
						else if (d != primeNums[scan]) prime = "Composite"; // if it doesnt find a prime
					}
				
    			squareroot = Math.sqrt(d); // gets the squareroot
    			squared = d * d; // squares it
    			// Displays output.
    			if (d >= 0 || d <= 100) JOptionPane.showMessageDialog(null, "You entered: " + d + "\n" + d + " is " + even + "\nThe squareroot of " + d + " is: " + squareroot + "\nThe square of " + d + " is " + squared + "\nThat number is a " + prime + " number");
    			playagain = JOptionPane.showConfirmDialog(null, "Would you like to play again?");
    			}
    			while (playagain == JOptionPane.YES_OPTION);
    	 	
    	}
}