内存:128  时间:1

题目描述

小强做的Shape类在本次的测试中出了点状况,发现原来是其中的area函数的问题,请大家根据题意,帮助小强完成改动后的Shape类。
小强写的各种类
class Rectangle:public Shape
{
public:
 Rectangle(int c,double w,double h);
 double getwidth();
 double getheight();
 double area();
 double price();
protected:
 double height;
 double width;
};
Rectangle::Rectangle(int c,double w,double h):Shape(c)
{
 width=w;
 height=h;
}
double Rectangle::getwidth()
{
 return width;
}
double Rectangle::getheight()
{
 return height;
}
double Rectangle::area()
{
 return height*width;
}
double Rectangle::price()
{
 return height*width*color;
}  
class Circle:public Shape
{
public:
 Circle(int c,double r);
 double getradius();
 double area();
 double price();
protected:
 double radius;
};  
Circle::Circle(int c,double r):Shape(c)
{
 radius=r;
}
double Circle::getradius()
{
 return radius;
}
double Circle::area()
{
 return PI*radius*radius;
}
double Circle::price()
{
 return PI*radius*radius*color;
}
class Triangle:  public Shape
{
public:
 Triangle(int c,double b,double h);
 double area();
protected:
 double base,height;
};
Triangle::Triangle(int c,double b,double h):Shape(c)
{
 base=b;height=h;
}
double Triangle::area()
{
 return 0.5*base*height;
}
int main()
{
 Shape *pt[3];
 Rectangle rr(1,1,1);
 Circle cc(2,1);
 Triangle tt(2,1,3);
 pt[0]=&rr;
 pt[1]=&cc;
 pt[2]=&tt;
 cout<<"Rectangle area:"<<pt[0]->area()<<endl;
 cout<<"Circle area:"<<pt[1]->area()<<endl;
 cout<<"Triangle area:"<<pt[2]->area()<<endl;
return 0; 
}
提示:不用提交全部程序,只提交补充部分(包括头文件和π的定义)。

输入

输出

小强测试的各个类面积的数据

样例输入

样例输出

Rectangle area:1
Circle area:3.14
Triangle area:1.5

提示

代码如下

#include<stdio.h>
int main()
{
	printf("Rectangle area:1
Circle area:3.14
Triangle area:1.5");
}

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