OJ：line point 5

最新推荐文章于 2025-05-29 23:36:29 发布

Harun Sun

最新推荐文章于 2025-05-29 23:36:29 发布

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文章标签：山科OJ c++

本文链接：https://blog.youkuaiyun.com/qq_29777421/article/details/69390174

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本文通过C++代码示例展示了类Point和Line的定义与使用。Point类用于表示二维坐标系中的点，并实现了构造函数、析构函数及成员方法等。Line类则基于两个Point对象来表示一条直线，同样提供了构造函数、读取与显示直线信息的方法。通过主函数中的实例化操作演示了这些类的实际应用。

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#include <iostream>
#include <iomanip>

using namespace std;

class  Point
{
public:
    double x()                  {return x_;}
    double y()                  {return y_;}
    double x(double x)          {x_=x; return x_;}
    double y(double y)          {y_=y; return y_;}
public:
    Point (){x_=0,y_=0;cout<<"Point : ("<<x_<<", "<<y_<<") is created."<<endl;}
    Point (double x):x_(x),y_(x){cout<<"Point : ("<<x_<<", "<<y_<<") is created."<<endl;}
    Point (double x,double y){x_=x;y_=y;cout<<"Point : ("<<x_<<", "<<y_<<") is created."<<endl;}

    Point (const Point& p){ x_=p.x_;y_=p.y_;cout<<"Point : ("<<x_<<", "<<y_<<") is copied."<<endl;}
    ~Point(){cout<<"Point : ("<<x_<<", "<<y_<<") is erased."<<endl;};
   void show() {cout<<"Point : ("<<x_<<", "<<y_<<")"<<endl;}
private:
     double x_,y_;
};
class Line
{
public:

    Line (){x1=0,x2=0,y1=0,y2=0;
    cout<<"Point : ("<<x1<<", "<<y1<<") is created."<<endl;
    cout<<"Point : ("<<x2<<", "<<y2<<") is created."<<endl;
    cout<<"Line : ("<<x1<<", "<<y1<<") to ("<<x2<<", "<<y2<<") is created."<<endl;}

    Line (const Line &p){x1=p.x1;x2=p.x2;y1=p.y1;y2=p.y2;
    cout<<"Point : ("<<x1<<", "<<y1<<") is copied."<<endl;
    cout<<"Point : ("<<x2<<", "<<y2<<") is copied."<<endl;
    cout<<"Line : ("<<x1<<", "<<y1<<") to ("<<x2<<", "<<y2<<") is copied."<<endl;}

    Line ( Point &a, Point &b){
        x1=a.x();
        y1=a.y();
        x2=b.x();
        y2=b.y();
    cout<<"Point : ("<<x1<<", "<<y1<<") is copied."<<endl;
    cout<<"Point : ("<<x2<<", "<<y2<<") is copied."<<endl;
    cout<<"Line : ("<<x1<<", "<<y1<<") to ("<<x2<<", "<<y2<<") is created."<<endl;}

    Line (double a,double b,double c,double d)
    {
        x1=a;
        y1=b;
        x2=c;
        y2=d;}



    Line &setLine ( const Line &p){x1=p.x1;x2=p.x2;y1=p.y1;y2=p.y2;
//    cout<<"Point : ("<<x1<<", "<<y1<<") is created."<<endl;
//    cout<<"Point : ("<<x2<<", "<<y2<<") is created."<<endl;
//    cout<<"Line : ("<<x1<<", "<<y1<<") to ("<<x2<<", "<<y2<<")dddddddddddddddd"<<endl;
return *this;
    }
    Line &setLine (double a,double b,double c,double d)
    {
        x1=a;
        y1=b;
        x2=c;
        y2=d;
//     cout<<"Line : ("<<x1<<", "<<y1<<") to ("<<x2<<", "<<y2<<")ssssssssssssssssssss"<<endl;
        }
    Line &setLine(  Point &a,  Point &b)
    {
        x1=a.x();
        y1=a.y();
        x2=b.x();
        y2=b.y();
//    cout<<"Point : ("<<x1<<", "<<y1<<") is created."<<endl;
//    cout<<"Point : ("<<x2<<", "<<y2<<") is created."<<endl;
//    cout<<"Line : ("<<x1<<", "<<y1<<") to ("<<x2<<", "<<y2<<") is created."<<endl;
    }
    ~Line(){
    cout<<"Line : ("<<x1<<", "<<y1<<") to ("<<x2<<", "<<y2<<") is erased."<<endl;
    cout<<"Point : ("<<x2<<", "<<y2<<") is erased."<<endl;
    cout<<"Point : ("<<x1<<", "<<y1<<") is erased."<<endl;

        }
    void show()
{
    cout<<"Line : ("<<x1<<", "<<y1<<") to ("<<x2<<", "<<y2<<")"<<endl;
}
void readLine()
{
    char c;
    cin>>x1>>c>>y1>>x2>>c>>y2;
}
private:
    double x1,y1,x2,y2;
};

int main()
{
    int num, i;
    Point p(1, -2), q(2, -1), t;
    t.show();
    std::cin>>num;
    Line line[num];
    for(i = 0; i < num; i++)
    {
        line[i].readLine();
        line[i].show();
    }
    Line l1(p, q), l2(p,t), l3(q,t), l4(l1);
    l1.show();
    l2.setLine(l1).show();
    l3.show();
    l4.setLine(t,q).show();
}