C++ 静态成员的访问

设计一个书类,能够保存书名、定价，以及所有书的本数和总价。

#include<iostream>
#include<string>
using namespace std;
class Book {
private:
	string bkName;
	double price;
	static int number;
	static double totalPrice;
public:
	Book() { bkName = ""; price = 0; number++; };
	Book(string, double);
	~Book();
	void setName(string bname) { bkName = bname; }
	void setPrice(double bprice) {
		totalPrice -= price;
		price = bprice;
		totalPrice += price;
	}
	double getPrice() { return price; }
	string getName() { return bkName; }
	static int getNumber() { return number; }
	static double getTotalPrice() { return totalPrice; }
	void display();
};
Book::Book(string name, double Price) {
	bkName = name;
	price = Price;
	number++;
	totalPrice += price;
}
Book::~Book() {
	number--;
	totalPrice -= price;
}
void Book::display() {
	cout << "book name:" << bkName << " " << "price:" << price << endl;
	cout << "number:" << number << " " << "totalPrice:" << totalPrice << endl;
	cout << "call static function" << getNumber() << endl;
}
int Book::number = 0;
double Book::totalPrice = 0;
void main() {
	Book b1("C++程序设计", 32.5), b2;
	b2.setName("数据系统原理");
	b2.setPrice(23);
	cout << b1.getName() << "\t" << b1.getPrice() << endl;
	cout << b2.getName() << "\t" << b2.getPrice() << endl;
	cout << "总共:" << b1.getNumber() << "\t本书"
		<< "\t总价" << b1.getTotalPrice() << "\t元" << endl;
	{Book b3("数据系统原理", 23);
	cout << "总共:" << b1.getNumber() << "\t本书"
		<< "\t总价" << b1.getTotalPrice() << "\t元" << endl;
	}
	cout << "总共:" << Book::getNumber() << "\t本书"
		<< "\t总价" << Book::getTotalPrice() << "\t元" << endl;
	b2.display();
}