vc++相关程序问题

vc++相关继承 以及 派生应用实践相关程序问题……谢谢了……定义一个基类

题目有问题啊，Line的构造函数需要4个参数才行。

#include <iostream>
#include <math.h>
using namespace std;
class Point
{
protected:
    double x1, y1;
public:
    Point(double a, double b)
    {
        x1 = a;
        y1 = b;
    }
    void print()
    {
        cout << "x1=" << x1 << ",y1=" << y1 << endl;
    }
};

class Line :private Point
{
private:
    double x2, y2;
    double d;
public:
    Line(double a1, double b1, double a2, double b2) :Point(a1, b1)
    {
        x2 = a2;
        y2 = b2;
    }
    void distance()
    {
        d = sqrt((x1 - x2) * (x1 - x2) + (y1 - y2) * (y1 - y2));
    }

    void show()
    {
        Point p1(x1, y1);
        Point p2(x2, y2);
        p1.print();
        p2.print();
        cout << "两点间的距离：" << d << endl;
    }
};

int main()
{
    Line ln(2, 3, 4, 5);
    ln.distance();
    ln.show();
    return 0;
}

你题目的解答代码如下：

#include <iostream>
#include <math.h>
using namespace std;

//点类
class Point
{
protected:
    double x1,y1;

public:
    Point(double a, double b)
    {
        x1=a;
        y1=b;
    }
    void print()
    {
        cout << "x1=" << x1 << " y1=" << y1 << endl;
    }
};
//Line类
class Line : public Point
{
private:
    double x2,y2;
    double d;
public:
    Line(double a, double b,double c, double d) : Point(a,b)
    {
        x2=c;
        y2=d;
    }
    double distanse()
    {
        double x = x1 - x2;
        double y = y1 - y2;
        double temp = x * x + y * y;
        double dis = sqrt(temp);
        return dis;
    }
    void show()
    {
        print();
        cout << "x2=" << x2 << " y2=" << y2 << endl;
        cout << "distanse=" << distanse() << endl;
    }
};
int main()
{
    Line d(1.0, 2.0, 5.0, 6.0);
    d.show();
    return 0;
}

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