题目为计算两点之间距离。
面向过程的思维方式，两点的横坐标之差，纵坐标之差，平方求和，再开跟，得到两点之间距离。
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks; namespace Classes_2_point_distance
{
class Program
{
static void Main(string[] args)
{
int x1 = -1;
int y1 = -1;
int x2 = int.Parse(Console.ReadLine());
int y2 = int.Parse(Console.ReadLine()); int xdiff = x2 - x1;
int ydiff = y2 - y1;
double distance = Math.Sqrt(xdiff * xdiff + ydiff * ydiff); Console.WriteLine(distance);
Console.ReadKey(); }
}
}
面向对象的思路，题目中，两点间直线距离，名词包括点、直线、距离,首先我们构造一个点类。
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks; namespace Classes_2_point_distance
{
class Point
{
private int x;
private int y; public Point()
{
x = -1;
y = -1;
} public Point(int h, int z)
{
x = h;
y = z;
}
public double Distance(Point p)
{
int xdiff = x - p.x;
int ydiff = y - p.y; return Math.Sqrt(xdiff * xdiff + ydiff * ydiff); }
}
}
然后再Programe.cs中实例化p1，p2两个点，计算距离
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks; namespace Classes_2_point_distance
{
class Program
{
static void Main(string[] args)
{
//int x1 = -1;
//int y1 = -1;
int x2 = int.Parse(Console.ReadLine());
int y2 = int.Parse(Console.ReadLine()); //int xdiff = x2 - x1;
//int ydiff = y2 - y1;
//double distance = Math.Sqrt(xdiff * xdiff + ydiff * ydiff); //Console.WriteLine(distance);
//Console.ReadKey(); Point p1 = new Point();
Point p2 = new Point(x2, y2);
double distance = p1.Distance(p2);
Console.WriteLine(distance);
Console.ReadKey(); }
}
}