/**
 * struct Point {
 *  int x;
 *  int y;
 *  Point(int xx, int yy) : x(xx), y(yy) {}
 * };
 */
#include <cmath>
class Solution {
  public:
    /**
     * 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
     */
    double calculateDistance(Point point_A, Point point_B) {
        double x = point_A.x - point_B.x;
        double y = point_A.y - point_B.y;
        return sqrt(x * x + y * y);
    }
};