#include<iostream>
using namespace std;
class point
{
private:
double x, y;
public:
point(double t, double b)
{
x = t;
y = b;
}
void display()
{
cout << "(" << x << "," << y << ")" << endl;
}
};
class circle :public point
{
private:
double r;
point p1;
public:
circle(double t, double b, double z) :point(t, b)
{
r = z;
}
void display1()
{
cout << "圆心位于:"; p1.display(); cout << endl;
cout << "该圆的半径为:" << r << endl;
}
};
void main()
{
circle c1(1, 1, 1);
c1.display1();
cout << endl;
}
circle类在运行时显示没有构造函数,请帮忙