在C++中出现很长的“no match for'operator+'”错误

Question

我对C++不太熟悉，正在为我正在修的一门课程写一个“银行”课。每次尝试编译bank.cpp文件时都会出现一个很长的错误。我怀疑我遗漏了一些很明显的东西，但我不知道是什么，因为这个错误对我来说没有任何意义。

#include <iostream>

#include "Bank.h"

Bank::Bank(): savings(0), checking(0) { }

Bank::Bank(double savings_amount, double checking_amount): savings(savings_amount), checking(checking_amount) { }

void Bank::deposit(double amount, string account)
{
        if (account == "S") {
                savings = savings + amount;
        } else {
                checking += amount;
        }
}

void Bank::withdraw(double amount, string account)
{
        if (account == "S") {
                savings -= amount;
        } else {
                checking -= amount;
        }
}

void Bank::transfer(double amount, string account)
{
        if (account == "S") {
                savings -= amount;
                checking += amount;
        } else {
            checking -= amount;
        }
}

void Bank::transfer(double amount, string account)
{
        if (account == "S") {
                savings -= amount;
                checking += amount;
        } else {
                checking -= amount;
                savings += amount;
        }
}

void Bank::print_balances()
{
        cout << "Savings: $ " << savings;
        cout << "Checking: $ " << checking;
}

#ifndef BANK_H
#define BANK_H

#include <string>

#include "Account.h"

using namespace std;

class Bank {
private:
    Account savings;
    Account checking;
public:
    Bank();
    Bank(double savings_amount, double checking_amount);
    void deposit(double amount, string account);
    void withdraw(double amount, string account);
    void transfer(double amount, string account);
    void print_balances();
};

#endif

下面是顶部引用的“account.h”头文件：

#ifndef ACCOUNT_H
#define ACCOUNT_H


class Account {
private:
    double balance;
    double interest_rate;
public:
    Account();
    Account(double amount, double rate);
    void deposit(double);
    bool withdraw(double);
    double query();
    void set_interest_rate(double rate);
    double get_interest_rate();
    void add_interest();
};

#endif

这是我收到的一个神秘的错误：

有人知道我做错了什么吗？我肯定这是很愚蠢的事情。我也可以发布头文件，但由于远程编辑问题，很难做到这一点。

Answer 1

如果您不想在类中添加额外的运算符，那么与其写：

savings = savings + amount;

使用Account类已经声明的方法并编写：

savings.deposit(amount);