1000.1 Letters and Words homework 12

#include <iostream>

#include <iomanip>

#include <cmath>

using namespace std;

//your code will be here
class Land

{

public:

Land() : price_(0) {}

explicit Land(int price);

// calculate how much Feng Gor can earn from the land

virtual double CalMoney() = 0;

protected:

// price of unit area

int price_;

};

class Square : public Land

{

public:

Square(double len, int price);

double CalMoney();

private:

//length of side of a square

double len_;

};

class Circle : public Land

{

public:

Circle(double radius, int price);

double CalMoney();

private:

//length of radius of a circle

double radius_;

};

Circle::Circle(double radius, int price){
 radius_ = radius;
 price_ = price;
}
double Circle::CalMoney(){
 return acos(-1)*price_ * radius_ * radius_;
}
 
Square::Square(double len, int price){
 len_ = len;
 price_ = price;
}
 
double Square::CalMoney(){
 return len_ * len_ * price_;
}
 
 void  Accountant::DevelopEstate(Land* land){
 money_ += land->CalMoney();
}
 
double Accountant::CheckMoney(){
 return money_;
}

class Accountant

{

public:

Accountant() : money_(0) {}

// develop a land, earn the value of the land

void DevelopEstate(Land* land);

// return the value of money_

double CheckMoney();

private:

double money_;

};

int main(int argc, const char *argv[])

{

Accountant py;

Circle *a = new Circle(100, 10000);

Square *b = new Square(100, 50000);

py.DevelopEstate(a);

cout << setprecision(10) << py.CheckMoney() << endl;

py.DevelopEstate(b);

cout << setprecision(10) << py.CheckMoney() << endl;

return 0;

}