HDU 2001 计算两点间的距离

#include <stdio.h>
#include <string.h>
#include <algorithm>
#include <iostream>
#include <math.h>

int main()
{
    double a, b, c, d;
    double result;
    while(scanf("%lf %lf %lf %lf", &a, &b, &c, &d) != EOF){
        double x = (a-c) * (a-c);
        double y = (b-d) * (b-d);
        printf("%.2lf\n",sqrt(x+y));
    }
}

import java.util.Arrays;
import java.util.Scanner;

public class Main{
    public static void main(String[] args) {
        Scanner sin=new Scanner(System.in);
        while(sin.hasNextDouble()){
            double a, b, c, d;
            a = sin.nextDouble();
            b = sin.nextDouble();
            c = sin.nextDouble();
            d = sin.nextDouble();
            double x = (a-c) * (a-c);
            double y = (b-d) * (b-d);
            double result = Math.sqrt(x+y);
            String res = String .format("%.2f", result);
            System.out.println(res);
        }
    }
}