YTU 2920: Shape系列-7

YTU 2920: Shape系列-7

2921: Shape系列-7

时间限制: 1 Sec   内存限制: 128 MB

提交: 156

解决: 129

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:"<area()<area()<area()<

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

无

输出

小强测试的各个类面积的数据

样例输出

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

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#includeusing namespace std;#define PI 3.14class Shape{public: Shape(int c):color(c) {} virtual double area()=0; int color;};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:"<area()<area()<area()<

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