#include "cmath"
#include "iostream"
using namespace std;
class CPoint
{
public:
    CPoint(){cout<<"CPoint类的无参构造函数被调用"<<endl;}
    CPoint(int xx,int yy);
    CPoint(CPoint &p);
    ~CPoint(){cout<<"CPoint类的析构函数被调用"<<endl;}
    getx();
    gety();
private:
    int x;
    int y;
};
CPoint::CPoint(int xx,int yy)
{
    x=xx;
    y=yy;
    cout<<"CPoint类的有参构造函数被调用"<<endl;
}
CPoint::CPoint(CPoint &p)
{
    x=p.x;
    y=p.y;
    cout<<"CPoint类的复制构造函数被调用"<<endl;
}
CPoint::getx()
{
    return x;
}
CPoint::gety()
{
    return y;
}
class CRect
{
public:
    CRect(){cout<<"CRect类的无参构造函数被调用"<<endl;}
    CRect(CPoint xp1,CPoint xp2);
    CRect(int x,int y,int m,int n);
    CRect(CRect &1);
    ~CRect(){cout<<"CRect类的析构函数被调用"<<endl;}
    getArea();
private:
    int x;
    int y;
    int m;
    int n;
    CPoint p1,p2;
    int Area;
};
CRect::CRect(CPoint xp1,CPoint xp2):p1(xp1),p2(xp2)
{
    cout<<"CRect类的有参构造函数被调用"<<endl;
    int x=static_cast<int>(p1.getx()-p2.getx());
    int y=static_cast<int>(p1.gety()-p2.gety());
    int Area=x*y;
}
CRect::CRect(int x,int y,int m,int n)
{
    this->x=x;
    this->y=y;
    this->m=m;
    this->n=n;
    cout<<"CRect类的有4参构造函数被调用"<<endl;
}
CRect::CRect(CRect &1):p1(1.p1),p2(1.p2)
{
    cout<<"CRect类的复制构造函数被调用"<<endl;
    Area=1.Area;
    x=1.x;
    y=1.y;
    m=1.m;
    n=1.n;
}
CRect::getArea()
{
    return Area;
}
void main()
{   
    int a,b,c,d;
    cout<<"input a,b,c,d:";
    cin>>a>>b>>c>>d>>endl;
    CPoint myp1(a,b),myp2(c,d);
    CRect rect1,rect2(myp1,myp2),rect3(a,b,c,d),rect4(rect2);
    cout<<"rect1面积为:"<<rect1.getArea()<<endl;
    cout<<"rect2面积为:"<<rect2.getArea()<<endl;
    cout<<"rect3面积为:"<<rect3.getArea()<<endl;
    cout<<"rect4面积为:"<<rect4.getArea()<<endl;
}

运行不了，求解

实在写不出来了