C++不存在从 到 的适当转换函数
#include<iostream>
#include<iomanip>
using namespace std;
class Point
{
public:
double X, Y;
Point(double x, double y);
double GetX();
double GetY();
double SetPoint(double x0, double y0);
void Show();
};
Point::Point(double x=0, double y=0) :X(x), Y(y)
{
}
double Point::GetX()
{
return X;
}
double Point::GetY()
{
return Y;
}
double Point::SetPoint(double x0, double y0)
{
X = x0;
Y = y0;
}
void Point::Show()
{
cout << X << " " << Y << endl;
}
class Circle :public Point
{
public:
double m_X,m_Y,R;
double Girth();
double Area();
void Show();
Circle(double m_x, double m_y, double r);
};
Circle:: Circle(double m_x, double m_y, double r)
{
m_X = m_x;
m_Y = m_y;
R = r;
}
double Circle::Girth()
{
return 2 * 3.14 * R;
}
double Circle::Area()
{
return 3.14 * R * R;
}
void Circle::Show()
{
cout << "(" << m_X << "," << m_Y << ")" << endl;
cout << R;
}
class Cylinder :public Circle
{
public:
Cylinder();
double H, Feature;
double SetCylinder(Circle(double m_x, double m_y, double r), double h);
double Area();
double Volumn();
void Show();
};
double Cylinder::SetCylinder(Circle(double m_x, double m_y, double r),double h)
{
H = h;
}
double Cylinder::Area()
{
return 2 * 2 * Circle::R * Circle::R + 2 * 3.14 * Circle::R * H;
}
double Cylinder::Volumn()
{
return 3.14 * Circle::R * Circle::R * H;
}
void Cylinder::Show()
{
cout << "(" << m_X << "," << m_Y << ")" << endl;
cout << R << endl;
cout << H << endl;
}
int main()
{
double x, y;
cin >> x >> y;//若输入：10 20
Point p1(x, y);
p1.SetPoint(x + 10, y + 5);
cout << fixed << setprecision(1);
p1.Show();//单独占一行输出：10,20
Circle c1(p1.GetX(), p1.GetY(), 20);
c1.Show();//输出两行：圆心一行，半径一行
cout << "c1的周长是：" << c1.Girth() << endl;//一个数据一行
cout << "c1的面积是：" << c1.Area() << endl;//一个数据一行
Cylinder cy1;
cy1.SetCylinder(c1, 10.5);
cy1.Show();//输出三行：圆心一行，半径一行，高一行
cout << "cy1的表面积是：" << cy1.Area() << endl;//一个数据一行
cout << "cy1的体积是：" << cy1.Volumn() << endl;//一个数据一行
return 0;
}
建议将报错内容贴出来。
你的Set函数参数定义有问题，写成函数指针类型了，应该是
SetCylinder(Circle c1,double h)
关键是第70行的问题 double SetCylinder(Circle(double m_x, double m_y, double r), double h);
应该定义喂：double SetHeight(double h);
而在Cylinder的构造函数提供父类Circle的double m_x, double m_y, double r
我修改了构造函数，运行通过了。
#include<iostream>
#include<iomanip>
using namespace std;
class Point
{
public:
double X, Y;
Point(double x, double y);
double GetX();
double GetY();
void SetPoint(double x0, double y0);
void Show();
};
Point::Point(double x=0, double y=0) :X(x), Y(y)
{
}
double Point::GetX()
{
return X;
}
double Point::GetY()
{
return Y;
}
void Point::SetPoint(double x0, double y0)
{
X = x0;
Y = y0;
}
void Point::Show()
{
cout << X << " " << Y << endl;
}
class Circle :public Point
{
public:
double m_X,m_Y,R;
double Girth();
double Area();
void Show();
Circle(double m_x, double m_y, double r);
};
Circle:: Circle(double m_x, double m_y, double r)
{
m_X = m_x;
m_Y = m_y;
R = r;
}
double Circle::Girth()
{
return 2 * 3.14 * R;
}
double Circle::Area()
{
return 3.14 * R * R;
}
void Circle::Show()
{
cout << "(" << m_X << "," << m_Y << ")" << endl;
cout << R;
}
class Cylinder :public Circle
{
public:
Cylinder(double m_x, double m_y, double r, double h);
Cylinder(const Circle& circle, double h);
double H, Feature;
void SetHeight(double h);
double Area();
double Volumn();
void Show();
};
Cylinder::Cylinder(double m_x, double m_y, double r, double h): Circle(m_x, m_y, r)
{
H = h;
}
Cylinder::Cylinder(const Circle& circle, double h): Circle(circle)
{
H = h;
}
void Cylinder::SetHeight(double h)
{
H = h;
}
double Cylinder::Area()
{
return 2 * 2 * Circle::R * Circle::R + 2 * 3.14 * Circle::R * H;
}
double Cylinder::Volumn()
{
return 3.14 * Circle::R * Circle::R * H;
}
void Cylinder::Show()
{
cout << "(" << m_X << "," << m_Y << ")" << endl;
cout << R << endl;
cout << H << endl;
}
int main()
{
double x, y;
cin >> x >> y;//若输入：10 20
Point p1(x, y);
p1.SetPoint(x + 10, y + 5);
cout << fixed << setprecision(1);
p1.Show();//单独占一行输出：10,20
Circle c1(p1.GetX(), p1.GetY(), 20);
c1.Show();//输出两行：圆心一行，半径一行
cout << "c1的周长是：" << c1.Girth() << endl;//一个数据一行
cout << "c1的面积是：" << c1.Area() << endl;//一个数据一行
Cylinder cy1(c1, 10.5);
cy1.Show();//输出三行：圆心一行，半径一行，高一行
cout << "cy1的表面积是：" << cy1.Area() << endl;//一个数据一行
cout << "cy1的体积是：" << cy1.Volumn() << endl;//一个数据一行
return 0;
}
// Output:
10 20
20.0 25.0
(20.0,25.0)
20.0c1的周长是：125.6
c1的面积是：1256.0
(20.0,25.0)
20.0
10.5
cy1的表面积是：2918.8
cy1的体积是：13188.0
1.你定义的函数，返回值l类型是double的，必须return 一下。或者把double Point::SetPoint(double x0, double y0) 函数修改为void Point::SetPoint(double x0, double y0) 。其它函数类同。
2.将double SetCylinder(Circle(double m_x, double m_y, double r), double h);按照如下方法修改：（如有帮助，请采纳，谢谢）
class Cylinder :public Circle
{
public:
Cylinder();
double H, Feature;
double SetCylinder(Circle cl, double h); //double SetCylinder(Circle(double m_x, double m_y, double r), double h);
double Area();
double Volumn();
void Show();
};
double Cylinder::SetCylinder(Circle cl,double h) //(double m_x, double m_y, double r)
{
H = h;
return 0;
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