HDOJ 2003 求绝对值

/**
* Created by YangYuan on 2017/12/8.
*/
public class Problem2003
{
public static void main(String[] args)
{
Scanner scanner = new Scanner(System.in);
DecimalFormat df = new DecimalFormat("0.00");
while (scanner.hasNext())
{
double x = scanner.nextDouble();
if (x < 0)
x = -x;
System.out.println(df.format(x));
}
}
}