binay_to_decimal_code

import javax.swing.JOptionPane;
public class New_Binary
{


	public static void main(String[] args)
	{ // TODO Auto-generated method stub
		String input;
		int num;

		Object convertOptions [] = {"Decimal to Binary", "Binary to Decimal", "Decimal or Binary to Octaldecimal", "Decimal or Binary to Hexadecimal"};
		final Object choice = (Object) JOptionPane.showOptionDialog(null, "What would you like to convert to?", null, JOptionPane.YES_NO_OPTION, JOptionPane.PLAIN_MESSAGE, null, convertOptions, null);


		if (choice.equals(0))
		{
			input = JOptionPane.showInputDialog("Enter a decimal number: ");
			System.out.println(input);
			num = Integer.parseInt(input);

			System.out.println("Answer: ");

			while (num > 0)
			{
				int binary = 0;
				int remainder = num % 2;


				binary = remainder + binary;
				num = num / 2;
				System.out.print(binary);
			}
			num++;

		}


		if (choice.equals(1))
		{

		input = JOptionPane.showInputDialog("Enter a binary number: ");
		System.out.println(input);
		num = Integer.parseInt(input);


		int decimal = 0;
		int power = 0;

		while(num > 0)
		{
		int remainder = num % 10;
		decimal += (remainder*Math.pow(2, power));

		num= num/10;
		power++;
		}

		System.out.println("Answer:" + decimal);

		}

		if (choice.equals(2))
		{

		}


		if (choice.equals(3))
		{
			input = JOptionPane.showInputDialog("Enter a decimal number: ");
			System.out.println(input);
			num = Integer.parseInt(input);

			char hex [] = {'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'};

			String answer = " ";

			while(num > 0)
		    {
				int remainder = 0;
				remainder = num % 16;
				answer = hex [remainder] + answer;
				num = num / 16;
		    }

			System.out.print("Answer: ");
		    System.out.print(answer);
		}



	}

}