错误:如何通过参数传递来解决此问题

#include "stdafx.h"
#include <iostream>
#include <string>
using std::cout;
using std::cin;
using std::endl;
using std::exit;
using std::string;
void pin(double &Balance);
void menu(double &Balance);
void helpMenu();
void withdraw(double &Balance);
void deposit(double &Balance);
void overdraft(double &Balance);
void overdraftMenu(double &Balance);
void viewBalance(double &Balance);
void BuisnessOverdraft(double &Balance);
void OverFiveOverdraft(double &Balance);
void UnderFiveOverdraft(double &Balance);

int main()
{   
    double Balance;
    pin(Balance);
    return 0;
}
void pin(double &Balance)
{
    int AccountPin = 8376;
    int AttemptNum = 0;
    int Pin;
    do
    {
        cout << "Enter your pin: ";
        cin >> Pin;
        if (Pin == AccountPin)
        {
            menu(Balance);
        } 
        else
        {
            cout << "Wrong pin, please try again." << endl;
            AttemptNum++;
        }
    } while (AttemptNum < 3);
    cout << "You have used all of your attempts, you can no longer attempt with this card" << endl;
    return;
}
void menu(double &Balance)
{
    int choice;
    do {
        cout << "Please choose from these options:n1: Withdrawn2: Depositn3: View balancen4: Apply for an Overdraftn5: Help menun6: ExitnPlease choose between 1 and 6: ";
        cin >> choice;
        switch (choice)
        {
        case 1:
            withdraw(Balance);
            break;
        case 2:
            deposit(Balance);
            break;
        case 3:
            viewBalance(Balance);
            break;
        case 4:
            overdraftMenu(Balance);
            break;
        case 5:
            helpMenu();
            break;
        case 6:
            exit(EXIT_FAILURE);
            break;
        default:
            cout << "Please try again" << endl;
            break;
        }
    } while (choice < 0 || choice > 6);
}
void helpMenu()
{
    cout << endl << "When prompted by the interface please input a number between the numbers it says.nYou cannot withdraw more than £200nIf you have nothing left in your account you can apply for a overdraft" << endl << endl;
    return;
}
void withdraw(double &Balance)
{   
    double withdraw;
    cout << "How much would you like to withdraw: ";
    cin >> withdraw;
    menu(Balance);
    Balance = Balance - withdraw;
    if (Balance < 0) {
        cout << "You need to apply for an overdraft" << endl;
        Balance =- withdraw;
    }
    return;
}
void deposit(double &Balance)
{
    double deposit;
    cout << "How much you like to deposit: ";
    cin >> deposit;
    menu(Balance);
    Balance =+ deposit;
    return;
}
void viewBalance(double &Balance)
{
    menu(Balance);
    double balance = Balance;
    cout << "You have " << char(156) << balance <<  " in your bank account" << endl;
    return;
}
void overdraftMenu(double &Balance)
{
    char choice;
    do {
        cout << "Would you like to apply for a overdraft, yes or no? ";
        cin >> choice;
        tolower(choice);
        if (choice == 'y') {
            overdraft(Balance);
        }
        else if (choice == 'n') {
            return;
        }
        else cout << "Please try again";
    } while (choice != 'y' || choice != 'n');
}
void overdraft(double &Balance)
{
    int choice;
    do {
        cout << "Are you:n1: A buisness ownern2: A customer of over 5 yearsn3: A customer of under 5 yearsnPlease enter a number between 1 and 3";
        cin >> choice;
        switch (choice)
        {
        case 1:
            BuisnessOverdraft(Balance);
            break;
        case 2:
            OverFiveOverdraft(Balance);
            break;
        case 3:
            UnderFiveOverdraft(Balance);
            break;
        default:
            cout << "Input a correct valuenPlease try again";
            break;
        }
    } while (choice < 1 || choice > 3);
}

void BuisnessOverdraft(double &Balance)
{
}
void OverFiveOverdraft(double &Balance)
{
}
void UnderFiveOverdraft(double &Balance)
{
}

我正在为学校工作创建一个ATM计划，我需要使用参数通过来获取资产价值和存款，撤回并申请透支。但是，当我运行代码然后存入余额时，余额不会增加。我还需要添加一个用于保存用户详细信息的系统，并且帐户详细信息将需要保存到文本文件中。