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#ifndef ACCOUNT_H_ #define ACCOUNT_H_ #include <string> class Account { public: Account(std::string name, double money); double getAccount() const; void deposit(double money); void applyint(); static void rate(double newRate); // 静态成员函数只能访问静态数据成员,只能调用静态成员函数, private: std::string owner; double amount; static double interestRate; // 这个就是静态数据成员,这个是所有的对象共用的,单独保存在数据存储区里边, // 这里只是一个声明,没有分配内存,在定义的时候才分配内存,在这里不能初始化, }; #endif
#include "Account.h" double Account::interestRate = 0.066; // 这个是函数的定义, Account::Account(std::string name, double money) : owner(name), amount(money) {} double Account::getAccount() const { return this->amount; } void Account::deposit(double money) { this->amount += money; } void Account::applyint() { this->amount += this->amount * interestRate; } void Account::rate(double newRate) { interestRate = newRate; }
# include <iostream> # include "Account.h" using namespace std; int main() { Account a("小崔", 8000); Account b("崔", 6000); Account c("崔崔", 6688); //a.deposit(10); cout << a.getAccount() << endl; Account::rate(0.1); // 在这里是我们调整所有账号的类, a.applyint(); cout << a.getAccount() << endl; return 0; }
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原文地址:http://blog.csdn.net/qq_31248551/article/details/51347882