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最新推荐文章于 2022-05-04 10:30:00 发布

原创最新推荐文章于 2022-05-04 10:30:00 发布 · 361 阅读

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本文展示了如何使用C++实现不同几何形状（圆形、矩形、三角形、正方形和梯形）的面积计算，并通过一个函数对这些形状的面积进行求和。

#include <iostream.h>
class Shape{
public:
	virtual double area()const =0;
};
class Circle:public Shape
{
public:
	Circle(double r):radius(r){}
	virtual double area() const
	{
	 return 3.1415*radius*radius;
	}
protected:
	double radius;
};
class Rectangle :public Shape{
public:
	Rectangle(double l,double w):length(l),width(w){}
	virtual double area()const
	{
	 return length*width;
	}
protected:
	double length;
	double width;
};
class Triangle:public Shape
{
public:
	Triangle(double d,double h):dibian(d),height(h){}
	virtual double area() const
	{
	 return 0.5*dibian*height;
	}
protected:
	double dibian;
	double height;
};
class Square:public Shape{
public:
	Square(double s):side(s){}
	virtual double area() const
	{
	 return side*side;
	}
protected:
	double side;
};
class Trapezoid:public Shape
{
public:
	Trapezoid(double t,double b,double h):top(t),bottem(b),height(h){}
	virtual double area() const
	{
	 return 0.5*(top+bottem)*height;
	}
protected:
	double top,bottem,height;
};
void display(const Shape &s)
{
 cout<<s.area()<<endl;
}
int main()
{
 Circle c(4);
 Rectangle r(2,4);
 Triangle t(1,2);
 Square s(2);
 Trapezoid tt(1,2,3);
 Shape *p[5]={&c,&r,&t,&s,&tt};
 double area=0.0;
 for(int i=0;i<5;i++)
 {
  area=area+p[i]->area();
 }
 cout<<"the sum of area is "<<area<<endl;
 return 0;
}

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