UVA – 10473 – Simple Base Conversion

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {
	public static void main(String[] args) throws IOException {
		// Scanner in = new Scanner(System.in);
		BufferedReader in = new BufferedReader(new InputStreamReader(System.in));

		String a;
		while ((a = in.readLine()) != null) {

			if (!a.contains("x")) {
				if(Double.parseDouble(a) < 0) break;
				System.out.println("0x"+ Integer.toHexString(Integer.parseInt(a)).toUpperCase());
			} else {

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