如何使用非静态函数计算用户输入

Question

我的测试环境：Visual Studio2010 Ultimate.

我收到的错误：

main.cpp(39): error C2352: 'Account::DepositAmt' : illegal call of non-static member function

我尝试将其更改为静态函数，但它只会导致更多错误。

account.cpp (23): error C2597: illegal reference to non-static member 'Account::balance' account.cpp(40): error C3867: 'Account::balance': function call missing argument list; use '&Account::balance' to create a pointer to member

我尝试使用尝试引用的建议进行修复，但失败得很惨。

objective，以便能够获取用户输入的初始余额，然后如果用户正在存款，则将其添加到余额中，如果用户正在取款，则减去它，然后打印最终余额。我需要创建成员函数

我只想弄清楚如何在不必更改为静态函数的情况下实现这一点（如果可能的话）。

这是我的

代码

Account.h

#define ACCOUNT_H
#include <iostream>
#include <cstring>


using namespace std;

class Account {

public:
    //Object constructor
     Account(char firstName[], char lastName[], char sinNumber[], double balance, int accountType, int transactions);

    //Object operations
    double DepositAmt(double amount);
    double WithdrawAmt(double amount);
    void PrintStatement();
    double getFinalBalance(double fbal);

private:
    //Object properties
    char firstName[255];
    char lastName[255];
    char sinNumber[255];
    double balance;
    int accountType;
    int transactions;
};

Account.cpp

#include "account.h"

//Initializing account entities
Account::Account(char fn[], char ln[], char sin[], double bal, int actype, int trans)
{
    strcpy(firstName, fn);
    strcpy(lastName, ln);
    strcpy(sinNumber, sin);
    balance = bal;
    accountType = actype;
    transactions = trans;
};

//Despoit amount to account of user, will return the balance now
double Account::DepositAmt(double amount) 
{
    if (amount < 0){
        cout << "You cannot deposit a negative balance!" << endl;
        return 0;
    }

    //this will be the balance now, and it adds balances, when we do a deposit
    balance += amount;

    return balance;

};

//Withdrawal amount from account of user
double Account::WithdrawAmt(double withdrawal)
{

    //if the withdraw amount is 0 or in minus then return 0
    if (withdrawal < 0)
    {
        cout<<"sorry we cannot process your withdraw at the moment, its either 0 or in minus"<<endl;
        return 0;   
    };
    //if what we are trying to withdraw is bigger than our balance, then it should fail too
    if (withdrawal > balance)
    {
        cout<<"Sorry the withdraw amount exceeds the account balance"<<endl;
        return 0;
    };

    //we deposited some amount in the deposite method, then we should have some money to withdraw
    balance = balance - withdrawal;

    return balance;

};


//Get final balance after withdrawal
 double Account::getFinalBalance(double fbal)
{
        //this will return the remaining amount
        return balance;
};

//Print remaining balance 
void Account::PrintStatement()
{
        cout<<"First Name: "<<firstName<<endl;
        cout<<"Last Name: " <<lastName<<endl;
        cout<<"SIN Number: " <<sinNumber<<endl;
        cout<<"Initial Balance: "<<balance<<endl;
        cout<<"Account Type: "<<accountType<<endl;
        cout<<"Transactions: "<<transactions<<endl;

};

主要.cpp

#include <iostream>
#include <string>
#include "account.h"


using namespace std;

int main()
{
    char firstName[255];
    char lastName[255];
    char sinNumber[255];
    double balance;
    int accountType;
    int transactions = 0;


    //Retrieve client information
    cout << "Please fill out the information below for registration:" << endl;
    cout << "Enter first name: ";
    cin.getline(firstName, 255);
    cout << "Enter last name: ";
    cin.getline(lastName, 255);
    cout << "Enter SIN number: ";
    cin.getline(sinNumber, 255);
    cout << "Please enter your initial balance: ";
    cin >> balance;
    cout << "Enter account type:\n-1 for Chequing\n-2 for Savings\n:::::: ";
    cin >> accountType;
    cout << "Please wait..." << endl;

    //Creating the account
    Account account(firstName, lastName, sinNumber, balance, accountType, transactions);

    double deposit;
    double withdraw;
    double amount;
    cout << "Amount to deposit: ";
    cin >> &Account::DepositAmt(deposit);
    cout << "Your new balance is: " << deposit << endl;




}

Answer 1

您应该首先获取用户对变量的输入，然后将其传递给方法：

cin >> amount;
deposit = account.DepositAmt(amount);

如何使用非静态函数计算用户输入

How to calculate user input using non-static functions

c++

static-functions