C++模拟ATM柜员机程序

课程题目：模拟ATM柜员机程序
内容要求：使用文本命令行设计模拟ATM柜员机程序。
要求使用文本命令行界面。当输入给定的卡号和密码（初始卡号和密码为123456）时，系统能登录ATM柜员机系统，用户可以按照以下规则进行：
(1)查询余额：初始余额为10000元
(2)ATM取款：每次取款金额为100的倍数，总额不超过5000元，支取金额不允许透支。
(3)ATM存款：不能出现负存款。
(4)修改密码：新密码长度不小于6位，不允许出现6位完全相同的情况，只有旧密码正确，新密码符合要求，且两次输入相同的情况下才可以成功修改密码。

代码如下：

#include <iostream>
#include<windows.h>
#include <string>
using namespace std;
class User
{
private:
    string userName = "123456";
    double balance = 10000;
    string password = "123456";
public:
    void menu();
    void inquire();
    void save();
    void draw();
    void change();
};
void User::inquire()
{
    SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), FOREGROUND_INTENSITY | FOREGROUND_GREEN);
    cout << "                          查询成功！您的余额为:" << balance << "元" << endl << endl;
    SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), FOREGROUND_INTENSITY | FOREGROUND_GREEN |
        FOREGROUND_BLUE | FOREGROUND_RED);
}
void User::save()
{
    double a;
part5:
    cout << "请输入您的存款金额:";
    cin >> a;
    if (a > 0)
    {
        balance += a;
        cout << endl;
        SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), FOREGROUND_INTENSITY | FOREGROUND_GREEN);
        cout << "                  存款成功，您已存入" << a << "元。" << "  " << "卡内余额为：" << balance << "元！" << endl << endl << endl;
        SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), FOREGROUND_INTENSITY | FOREGROUND_GREEN |
            FOREGROUND_BLUE | FOREGROUND_RED);
    }
    else
    {
        SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), FOREGROUND_INTENSITY | FOREGROUND_RED);
        cout << endl << "                      对不起，存款金额不可为负值，请重新输入" << endl << endl;
        SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), FOREGROUND_INTENSITY | FOREGROUND_GREEN |
            FOREGROUND_BLUE | FOREGROUND_RED);
        goto part5;

    }
}
void User::draw()
{
    int b;
 part6:
    cout << "请输入您要取款的金额（注：取款金额需为100的倍数）:";
    cin >> b;
    if (b > 0 && b % 100 != 0)
    {
        SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), FOREGROUND_INTENSITY | FOREGROUND_RED);
        cout << endl << "                输入错误，请重新输入!（注：取款金额需为100的倍数）" << endl << endl;
        SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), FOREGROUND_INTENSITY | FOREGROUND_GREEN |
            FOREGROUND_BLUE | FOREGROUND_RED);
        draw();
    }
    else
    {
        if (b > balance)
        {
            SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), FOREGROUND_INTENSITY | FOREGROUND_RED);
            cout << endl << "                           对不起，此卡不可透支!" << endl << endl;
            SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), FOREGROUND_INTENSITY | FOREGROUND_GREEN |
                FOREGROUND_BLUE | FOREGROUND_RED);
            return;
        }
        if (b >= 0 && b <= 5000)
        {
            balance -= b;
            cout << endl;
            SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), FOREGROUND_INTENSITY | FOREGROUND_GREEN);
            cout << "                  取款成功，您已取出" << b << "元！" << "  " << "卡内余额为：" << balance << "元！" << endl << endl << endl;
            SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), FOREGROUND_INTENSITY | FOREGROUND_GREEN |
                FOREGROUND_BLUE | FOREGROUND_RED);
        }
        else if (b < 0)
        {
            SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), FOREGROUND_INTENSITY | FOREGROUND_RED);
            cout << endl << "                   取款失败，取款金额不可为负值，请重新输入！" << endl << endl;
            SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), FOREGROUND_INTENSITY | FOREGROUND_GREEN |
                FOREGROUND_BLUE | FOREGROUND_RED);
            goto part6;
        }
        else if (b > 5000)
        {
            SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), FOREGROUND_INTENSITY | FOREGROUND_RED);
            cout << endl << "            取款失败，每次取款额不得超过5000元!" << endl << endl;
            SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), FOREGROUND_INTENSITY | FOREGROUND_GREEN |
                FOREGROUND_BLUE | FOREGROUND_RED);
        }
    }
}
void User::change()
{
    string p0, p1, p2;

    cout << "请输入旧密码:";
    cin >> p0;
    if (p0 == password)
    {
    part3:
        cout << "请输入新密码(注：密码长度不低于6且不能为6个相同的数):";
        cin >> p1;
        bool flag = false;
        for (int i = 0; i < p1.length() - 1; i++)
            if (p1[i] != p1[i + 1])
            {
                flag = true;
                break;
            }
        if (p1.length() < 6 || flag == false)
        {
            SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), FOREGROUND_INTENSITY | FOREGROUND_RED);
            cout << endl << endl << "                         输入格式有误，请重新输入！" << endl << endl;
            SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), FOREGROUND_INTENSITY | FOREGROUND_GREEN |
                FOREGROUND_BLUE | FOREGROUND_RED);
            goto part3;
        }
        else
        {
        part4:
            cout << "请再次输入新密码:";
            cin >> p2;
            if (p2.length() < 6)
            {
                SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), FOREGROUND_INTENSITY | FOREGROUND_RED);
                cout << endl << endl << "                           输入格式有误，请重新输入！" << endl << endl;
                SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), FOREGROUND_INTENSITY | FOREGROUND_GREEN |
                    FOREGROUND_BLUE | FOREGROUND_RED);
                goto  part4;
            }
        }

        if (p1 == p2)
        {
            password = p2;
            SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), FOREGROUND_INTENSITY | FOREGROUND_GREEN);
            cout << endl << "                         密码修改成功，请重新登录" << endl << endl;
            SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), FOREGROUND_INTENSITY | FOREGROUND_GREEN |
                FOREGROUND_BLUE | FOREGROUND_RED);
            User::menu();
        }
        else
        {
            SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), FOREGROUND_INTENSITY | FOREGROUND_RED);
            cout << endl << "                        两次密码输入不同，密码修改失败!" << endl << endl << endl;
            SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), FOREGROUND_INTENSITY | FOREGROUND_GREEN |
                FOREGROUND_BLUE | FOREGROUND_RED);
        }
    }
    else
    {
        SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), FOREGROUND_INTENSITY | FOREGROUND_RED);
        cout << endl << "                                    密码错误!" << endl << endl;
        SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), FOREGROUND_INTENSITY | FOREGROUND_GREEN |
            FOREGROUND_BLUE | FOREGROUND_RED);
    }
}
void User::menu()
{
    int c;
    string n, p;
part1:
    cout << "                                请输入卡号:";
    cin >> n;
    if (n == userName)
    {
    part2:
        cout << "                                请输入密码:";
        cin >> p;
        cout << endl;

        if (p == password)
        {
            system("cls");
            cout << "-------------------------------欢迎登录ATM柜员机--------------------------------" << endl;
            while (1)
            {


                cout << "         - - - - - - -  请选择您所需要的服务,并按回车确认- - - - - - - - " << endl;
                cout << "        |                         【1】查询余额                         |" << endl;
                cout << "        |                         【2】取款                             |" << endl;
                cout << "        |                         【3】存款                             |" << endl;
                cout << "        |                         【4】修改密码                         |" << endl;
                cout << "        |                         【0】退出                             |" << endl;
                cout << "         - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - " << endl;
                cin >> c;
                switch (c)
                {
                case 0:
                    return;
                case 1:
                    inquire();
                    break;
                case 2:
                    draw();
                    break;
                case 3:
                    save();
                    break;
                case 4:
                    change();
                    break;
                default:
                    SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), FOREGROUND_INTENSITY | FOREGROUND_RED);
                    cout << "                              无此项，请重新选取!" << endl << endl;
                    SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), FOREGROUND_INTENSITY | FOREGROUND_GREEN |
                        FOREGROUND_BLUE | FOREGROUND_RED);
                    break;
                }

            }

        }
        else
        {
            SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), FOREGROUND_INTENSITY | FOREGROUND_RED);
            cout << endl << "                         密码错误，请核对后重新输入!" << endl << endl; ;
            SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), FOREGROUND_INTENSITY | FOREGROUND_GREEN |
                FOREGROUND_BLUE | FOREGROUND_RED);
            goto part2;
        }
    }
    else
    {
        SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), FOREGROUND_INTENSITY | FOREGROUND_RED);
        cout << endl << "                        用户不存在，请核对后重新输入" << endl << endl;
        SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), FOREGROUND_INTENSITY | FOREGROUND_GREEN |
            FOREGROUND_BLUE | FOREGROUND_RED);
        goto part1;
    }

}
int main()
{
    char a = 1;
    SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), FOREGROUND_INTENSITY | FOREGROUND_GREEN |
        FOREGROUND_BLUE | FOREGROUND_RED);
    User user;
    cout << "                       " << "欢迎使用长春理工大学学生ATM系统" << endl << endl;
    SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), FOREGROUND_INTENSITY | FOREGROUND_GREEN |
        FOREGROUND_BLUE | FOREGROUND_RED);
    user.menu();
    SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), FOREGROUND_INTENSITY | FOREGROUND_GREEN);
    cout << "                       ";
    for (int i = 0; i < 3; i++)
        cout << a << "  ";
    cout << "很高兴为您服务，再见！";
    for (int i = 0; i < 3; i++)
        cout << a << "  ";
    cout << endl << endl;;
    SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), FOREGROUND_INTENSITY | FOREGROUND_GREEN |
        FOREGROUND_BLUE | FOREGROUND_RED);
    system("pause");
    return 0;
}

注：建议用VS或者codeblocks编译，不建议用VC++6.0，不然你会怀疑人生。

运行如下：