已知矩形两点求面积，要求用point类的组合，咋就编译不通过呢，求大大指点。
#include<iostream>
#include<math.h>
#include<Windows.h>
using namespace std;
class Point
{
public:
Point(int xx=0,int yy=0){X=xx;Y=yy;}
Point(Point &p);
int GetX(){return X;}
int GetY(){return Y;}
private:int X,Y;
};


Point::Point(Point &p)
{ X=p.X;
Y=p.Y;
cout<<"point拷贝以调用"<<endl;
}


class Rectangle{
public:
Rectangle(Point xp1,Point xp2);
double Area();
private:
Point p1,p2;
};


Rectangle::Rectangle(Point xp1,Point xp2):p1(xp1),p2(xp2){};



double Rectangle::Area()
{
double x=double(p1.GetX()-p2.GetX());
double y=double(p1.GetY()-p2.GetY());
return x*y;
}



void main()
{
Point myp1(1,1);
Point myp2(4,5);
Rectangle rectangle(myp1,myp2);
cout<<rectangle.Area()<<endl;
}


>c:\users\alone\documents\visual studio 2012\projects\project1\project1\源.cpp(45): error C2146: 语法错误: 缺少“;”(在标识符“rectangle”的前面)
1>c:\users\alone\documents\visual studio 2012\projects\project1\project1\源.cpp(45): error C3861: “rectangle”: 找不到标识符
1>c:\users\alone\documents\visual studio 2012\projects\project1\project1\源.cpp(46): error C2065: “rectangle”: 未声明的标识符
1>c:\users\alone\documents\visual studio 2012\projects\project1\project1\源.cpp(46): error C2228: “.Area”的左边必须有类/结构/联合


为啥这个Rectangle rectangle不对呢

[解决办法]
很古怪的错误，你的类名Rectangle和你包含的头文件(应该是windows.h)中的某个类有冲突还是咋的，我把所有的Rectangle替换成Rectangle__, 齐了。
[解决办法]
做了一些我认为必要或有价值的调整

#include<iostream>
#include<math.h>
#include<Windows.h>

using namespace std;
class Point
{
public:
Point(int xx=0,int yy=0){X=xx;Y=yy;}
Point(const Point &p);
int GetX()const{ return X; }
int GetY()const{ return Y; }

private:
int X,Y;
};


Point::Point(const Point &p)
{
X=p.X;
Y=p.Y;
cout<<"point拷贝以调用"<<endl;
}

   
class Rectangle__
{
public:
Rectangle__(const Point& xp1, const Point& xp2);
double Area()const;

private:
Point p1,p2;
};


Rectangle__::Rectangle__(const Point& xp1, const Point& xp2)
:p1(xp1),p2(xp2)
{
}

  
// be careful of negative area!!   
double Rectangle__::Area()const
{
return std::abs(double(p1.GetX()-p2.GetX())*(p1.GetY()-p2.GetY())); 
}

   

void main()
{  
Point myp1(1,1);
Point myp2(4,5);
Rectangle__ rectangle(myp1,myp2);

cout<<rectangle.Area()<<endl;

}

[解决办法]
告诉ＬＺ一个好办法，直接给自己的类加个命名空间不就得了～