Description 声明一个Shape抽象类，在此基础上派生出Rectangle类和Circle类，两者都有GetArea（）和GetPerim（）函数，用来计算面积和周长，麻烦封装以上各类，编写程序。需要提交类shape、Rectangle、Cricle类 Input 第一行输入n，表示n个测试例子；接下来有n行，每一行输入数，a、b、c，表示矩形的宽、长，以及圆形的半径 Output 对应每一行输入： 第一行输出矩形的面积、周长 第二行输出圆形的面积、周长 Sample_Input 1 2 2 3 ​ Sample_Ouput 4 8 28.26 18.84 4 8 28.26 18.84 cpp:#include <iostream> using namespace std; const double PI = 3.14; #include "source.h" int main() { //freopen("in.txt", "r", stdin); //freopen("out.txt", "w", stdout); double n,a,b,c; cin>>n; for(int i=0;i<n;i++) { Shape *s; cin>>a>>b>>c; s = new Rectangle(a,b); cout<<s->GetArea()<<" "<<s->GetPerim()<<endl; delete s; s = new Circle(c); cout<<s->GetArea()<<" "<<s->GetPerim()<<endl; delete s; } return 0; }

shape.h:

#ifndef SHAPE_H
#define SHAPE_H

class Shape {
public:
    virtual double GetArea() = 0;
    virtual double GetPerim() = 0;
};

#endif

rectangle.h:

#ifndef RECTANGLE_H
#define RECTANGLE_H

#include "shape.h"

class Rectangle : public Shape {
public:
    Rectangle(double width, double length);
    virtual double GetArea();
    virtual double GetPerim();
private:
    double m_width;
    double m_length;
};

#endif

rectangle.cpp:

#include "rectangle.h"

Rectangle::Rectangle(double width, double length)
    : m_width(width), m_length(length) {}

double Rectangle::GetArea() {
    return m_width * m_length;
}

double Rectangle::GetPerim() {
    return 2 * (m_width + m_length);
}

circle.h:

#ifndef CIRCLE_H
#define CIRCLE_H

#include "shape.h"

class Circle : public Shape {
public:
    Circle(double radius);
    virtual double GetArea();
    virtual double GetPerim();
private:
    double m_radius;
};

#endif

circle.cpp:

#include "circle.h"

#include <cmath>

Circle::Circle(double radius)
    : m_radius(radius) {}

double Circle::GetArea() {
    return PI * pow(m_radius, 2);
}

double Circle::GetPerim() {
    return 2 * PI * m_radius;
}