这是求两点之间的距离的程序，是用面向对象的方法做的-This is the distance between two points for the procedure is the use of object-oriented methods of

在一个按照东西和南北方向划分成规整街区的城市里，n个居民点散乱地分布在不同的街区中。用x坐标表示东西向，用y表示南北向。各居民点的位置可以由坐标（x，y）表示。街区中任意两点（x1，y1）和（x2，y2）之间的距离可以用数值|x1-x2|+|y1-y2|度量。-In a north-south direction in accordance with things and is divided into regular city blocks, n a settlements scattered

计算两点之间的距离，多种方式,计算两点之间的距离，多种方式,-Calculating the distance between two points, a variety of ways

c++通过大圆算法求地球上两点之间距离，方位-c++ seek distance between two points on the earth, through the great circle azimuth algorithm