C++之static

#include <iostream>

using namespace std;
//static类成员

class Account
{
public:
    Account(string name,double money):
        owner(name),amount(money){}
    double getAmount() const
    {
        return this->amount;
    }
    void sepoist(double money)
    {
        this->amount+=money;
    }
    //静态函数操作静态的数据成员
    //静态的成员函数中不能使用this指针
    static double rate()
    {
        return interestRate;
    }
    static void rate(double newinterestRate)
    {
        interestRate=newinterestRate;
    }
private:
    string owner;
    double amount;
    //将利率设置成为静态的数据成员，即利率只有一个
    //所有的对象都使用一个利率
    static double interestRate;
};
//进行初始化
double Account::interestRate=0.015;

int main()
{
    //静态的函数可以用类名直接调用
    Account::rate(0.026);
    Account a("张三",1000);
    Account b("李四",2000);
    a.sepoist(500);
    b.sepoist(600);
    cout<<a.getAmount()<<endl;
    cout<<b.getAmount()<<endl;
    cout<<a.rate()<<endl;
    a.rate(0.018);
    cout<<b.rate()<<endl;

    return 0;
}