java 浮点数定点输出

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import java.util.*;
import java.math.*;
import java.text.DecimalFormat;
public class Main {  
public static void main(String args[])
    {                
        Scanner cin=new Scanner(System.in);
double x1,y1,x2,y2;
        DecimalFormat df = new DecimalFormat("0.00"); 
while(cin.hasNext())
        {
            x1=cin.nextDouble();
            y1=cin.nextDouble();
            x2=cin.nextDouble();
            y2=cin.nextDouble();
double temp;
            temp=Math.sqrt(((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2)));
            System.out.println(df.format(temp));
        }
        }
    }