杭电oj 2003 java

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import java.util.Scanner;

class Main {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner read = new Scanner(System.in);
        while(read.hasNextDouble()) {
            double dou = read.nextDouble();
            System.out.printf("%.2f", Math.abs(dou));
            System.out.println();
        }
        read.close();
    }

}