HDU 2003

import java.text.DecimalFormat;import java.util.Scanner;/** * 求绝对值 * */public class Main{public static void main(String[] args) {Scanner in=new Scanner(System.in);DecimalFormat df=new DecimalFormat("#.00");while(in.hasNext()) {double n=in.nextDouble();System.out.println(df.format(Math.abs(n)));}}}