求助大神，一道题简单的题希望帮忙改改

Question

给出下面的一个基类框架：
class Point_1D
{ protected:
float x;//1D 点的x坐标
public:
Point_1D(float p = 0.0);
float distance( );//计算当前点到原点的距离
}
以Point_1D为基类建立一个派生类Point_2D，增加一个保护数据成员：
float y;//2D平面上点的y坐标
以Point_2D为直接基类再建立一个派生类Point_3D，增加一个保护数据成员：
float z;//3D立体空间中点的z坐标
生成上述类并编写主函数，根据输入的点的基本信息，建立点对象，并能计算该点到原点的距离。
输入格式： 测试输入包含若干测试用例，每个测试用例占一行（点的类型（1表示1D点，2表示2D点，3表示3D点） 第一个点坐标信息（与点的类型相关） 第二个点坐标信息（与点的类型相关））。当读入0时输入结束，相应的结果不要输出。
输入样例：
1 -1
2 3 4
3 1 2 2
0
输出样例：
Distance from Point -1 to original point is 1
Distance from Point(3,4) to original point is 5
Distance from Point(1,2,2) to original point is 3

以下是我的代码
#include
#include
using namespace std;
class Point_1D
{ protected:
float x;
public:
Point_1D(float p = 0.0):x(p){}
~Point_1D(){}
float distance( ){ return x>0?x:-x; }
void Print(){
cout< }
};
class Point_2D:public Point_1D{
protected:
float y;
public:
Point_2D(float x,float q):Point_1D(x),y(q){}
~Point_2D(){}
float distance( ){
return sqrt(x*x+y*y);}
void Print(){
cout };
class Point_3D:public Point_2D{
protected:
float z;
public:
Point_3D(float x,float y,float r):Point_2D(x,y),z(r){}
~Point_3D(){}
float distance( ){
return sqrt(x*x+y*y+z*z);}
void Print(){
cout };
int main()
{
int choice;
float x,y,z;
cin>>choice;
while(choice!=0){
if(choice==1){
cin>>x;
Point_1D D1(x);
cout<<"Distance from Point ";
D1.Print();
cout<<" to original point is "< }
else if(choice==2){
cin>>x>>y;
Point_2D D2(x,y);
cout<<"Distance from Point";
D2.Print();
cout<<"to original point is "<<D2.distance()<<endl;

    }
    else { 
    cin>>x>>y>>z;
    Point_3D D3(x,y,z);
    cout<<"Distance from Point";
    D3.Print();
    cout<<"to original point is "<<D3.distance()<<endl;
    }
    cin>>choice; 
}

}

Answer 1

#include <iostream>
using namespace std;
class Point_1D
{ protected:
float x;
public:
    Point_1D(float p = 0.0):x(p){}
    ~Point_1D(){}
    float distance( ){ return x>0?x:-x; }
    void Print(){
        cout<< x;
    }
};
class Point_2D:public Point_1D{
protected:
    float y;
public:
    Point_2D(float x,float q):Point_1D(x),y(q){}
    ~Point_2D(){}
    float distance( ){
        return sqrt(x*x+y*y);
    }
    void Print(){
        cout << "(" << x << "," << y << ")";
    }
};
class Point_3D:public Point_2D{
protected:
    float z;
public:
    Point_3D(float x,float y,float r):Point_2D(x,y),z(r){}
    ~Point_3D(){}
    float distance( ){
        return sqrt(x*x+y*y+z*z);}
    void Print(){
        cout << "(" << x << "," << y << "," << z << ")";
    }
};
int main()
{
    int choice;
    float x,y,z;
    cin>>choice;
    while(choice!=0){
        if(choice==1){
            cin>>x;
            Point_1D D1(x);
            cout<<"Distance from Point ";
            D1.Print();
            cout<<" to original point is "<< D1.distance() << endl;
        }
        else if(choice==2){
            cin>>x>>y;
            Point_2D D2(x,y);
            cout<<"Distance from Point";
            D2.Print();
            cout<<"to original point is "<<D2.distance()<<endl;
        }
        else { 
            cin>>x>>y>>z;
            Point_3D D3(x,y,z);
            cout<<"Distance from Point";
            D3.Print();
            cout<<"to original point is "<<D3.distance()<<endl;
        }
        cin>>choice; 
    }
}