point.cs

来自「微软（Microsoft）出版社C井练习文件及解答」· CS 代码 · 共 43 行

#region Using directives

using System;
using System.Collections.Generic;
using System.Text;

#endregion

namespace Classes
{
    public class Point
    {
        public Point()
        {
            this.x = -1;
            this.y = -1;
            objectCount++;
        }

        public Point(int x, int y)
        {
            this.x = x;
            this.y = y;
            objectCount++;
        }

        public double DistanceTo(Point other)
        {
            int xDiff = this.x - other.x;
            int yDiff = this.y - other.y;
            return Math.Sqrt(xDiff * xDiff + yDiff * yDiff);
        }

        public static int ObjectCount()
        {
            return objectCount;
        }

        private int x, y;
        private static int objectCount = 0;
    }
}