import java.util.*;

public class Solution {
    /**
     * 代码中的类名、方法名、参数名已经指定,请勿修改,直接返回方法规定的值即可
     *
     * 计算A点与B点之间的距离
     * @param point_A Point类 A点
     * @param point_B Point类 B点
     * @return double浮点型
     */
    public double calculateDistance (Point point_A, Point point_B) {
        double x = Math.pow(point_A.x-point_B.x,2);
        double y =Math.pow(point_A.y-point_B.y,2);
        double d = Math.pow(x+y,0.5);
        return d;
    }
}
class point{
    public int x;
    public int y;
    point(int x,int y){
        this.x = x;
        this.y = y;
    }
}