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)));
}
}
}
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