复习作业（9.3）

1创建Person类并添加相应的字段与方法和构造函数，并且有num字段能够记录这个类生生成了多少个具体的对象。

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

namespace lianxi1
{
class Person
{
public int age;
public double heigh;
public double weight;
private static int num;

public static int GetPersonCount()
{
return num;
}
public Person()
{
age = 20;
heigh = 180.00;
weight = 56.00;
num++;
}
public Person(int a, double b, double e)
{
age = a;
heigh = b;
weight = e;
num++;
}
public void message()
{

Console.WriteLine("年龄：{0}，身高：{1}，体重：{2} ",age,heigh,weight);
}
public void speak()
{
Console.WriteLine("Hello What's your name?");
}

}
}

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

namespace lianxi1
{
class Program
{
static void Main(string[] args)
{

Person p1 = new Person();
p1.message();
Console.WriteLine(Person.GetPersonCount());

Person p2 = new Person(21, 178.20, 55.00);
p2.message();
Console.WriteLine(Person.GetPersonCount());

Person p3 = new Person(22, 180.00, 54.00);
p2.message();
Console.WriteLine(Person.GetPersonCount());

Person p = new Person();
p.speak();



Console.ReadKey();
}
}
}

2分别使用面向过程的方法和面向对象的方法，完成如下命题：求 两点之间的距离。

面向过程：

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

namespace lianxi2
{
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：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace lianxi2
{
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);
}
}
}

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

namespace lianxi2
{
class Program
{
static void Main(string[] args)
{

int x2 = int.Parse(Console.ReadLine());
int y2 = int.Parse(Console.ReadLine());
Point p1 = new Point();
Point p2 = new Point(x2, y2);
double distance = p1.Distance(p2);
Console.WriteLine(distance);

Console.ReadKey();
}
}
}