用c++语言实现基于atm的银行账户管理系统

好的，下面是一个简单的基于ATM的银行账户管理系统的C语言实现。该程序包括以下功能：创建账户、存款、取款、查询余额、更改密码和退出系统。

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define MAX_ACCOUNTS 100 // 最大账户数
#define MAX_PASSWORD_LENGTH 16 // 最大密码长度

// 账户结构体
struct account {
    int account_number; // 账号
    char password[MAX_PASSWORD_LENGTH]; // 密码
    float balance; // 余额
};

// 全局变量
struct account accounts[MAX_ACCOUNTS]; // 账户数组
int num_accounts = 0; // 账户数量

// 函数声明
void create_account();
void deposit();
void withdraw();
void balance_inquiry();
void change_password();
void print_menu();
int get_account_index(int account_number, char *password);

int main() {
    int choice;
    char password[MAX_PASSWORD_LENGTH];
    int account_number;
    int index;

    while (1) {
        print_menu();
        printf("请输入您的选择：");
        scanf("%d", &choice);

        switch (choice) {
            case 1:
                create_account();
                break;
            case 2:
                printf("请输入账号：");
                scanf("%d", &account_number);
                printf("请输入密码：");
                scanf("%s", password);
                index = get_account_index(account_number, password);
                if (index >= 0) {
                    deposit(index);
                } else {
                    printf("账号或密码错误！\n");
                }
                break;
            case 3:
                printf("请输入账号：");
                scanf("%d", &account_number);
                printf("请输入密码：");
                scanf("%s", password);
                index = get_account_index(account_number, password);
                if (index >= 0) {
                    withdraw(index);
                } else {
                    printf("账号或密码错误！\n");
                }
                break;
            case 4:
                printf("请输入账号：");
                scanf("%d", &account_number);
                printf("请输入密码：");
                scanf("%s", password);
                index = get_account_index(account_number, password);
                if (index >= 0) {
                    balance_inquiry(index);
                } else {
                    printf("账号或密码错误！\n");
                }
                break;
            case 5:
                printf("请输入账号：");
                scanf("%d", &account_number);
                printf("请输入原密码：");
                scanf("%s", password);
                index = get_account_index(account_number, password);
                if (index >= 0) {
                    change_password(index);
                } else {
                    printf("账号或密码错误！\n");
                }
                break;
            case 6:
                printf("感谢使用本系统，再见！\n");
                exit(0);
            default:
                printf("无效的选择！\n");
                break;
        }
    }

    return 0;
}

// 创建账户
void create_account() {
    int account_number;
    char password[MAX_PASSWORD_LENGTH];
    float balance;

    if (num_accounts >= MAX_ACCOUNTS) {
        printf("账户数量已达上限！\n");
        return;
    }

    printf("请输入账号：");
    scanf("%d", &account_number);

    if (get_account_index(account_number, "") >= 0) {
        printf("该账号已存在！\n");
        return;
    }

    printf("请输入密码：");
    scanf("%s", password);
    printf("请输入余额：");
    scanf("%f", &balance);

    accounts[num_accounts].account_number = account_number;
    strcpy(accounts[num_accounts].password, password);
    accounts[num_accounts].balance = balance;

    num_accounts++;

    printf("账户创建成功！\n");
}

// 存款
void deposit(int index) {
    float amount;

    printf("请输入存款金额：");
    scanf("%f", &amount);

    accounts[index].balance += amount;

    printf("存款成功！\n");
    printf("当前余额为：%.2f\n", accounts[index].balance);
}

// 取款
void withdraw(int index) {
    float amount;

    printf("请输入取款金额：");
    scanf("%f", &amount);

    if (amount > accounts[index].balance) {
        printf("余额不足！\n");
        return;
    }

    accounts[index].balance -= amount;

    printf("取款成功！\n");
    printf("当前余额为：%.2f\n", accounts[index].balance);
}

// 查询余额
void balance_inquiry(int index) {
    printf("当前余额为：%.2f\n", accounts[index].balance);
}

// 更改密码
void change_password(int index) {
    char password[MAX_PASSWORD_LENGTH];

    printf("请输入新密码：");
    scanf("%s", password);

    strcpy(accounts[index].password, password);

    printf("密码修改成功！\n");
}

// 打印菜单
void print_menu() {
    printf("**********  ATM  **********\n");
    printf("* 1. 创建账户            *\n");
    printf("* 2. 存款                *\n");
    printf("* 3. 取款                *\n");
    printf("* 4. 查询余额            *\n");
    printf("* 5. 更改密码            *\n");
    printf("* 6. 退出系统            *\n");
    printf("****************************\n");
}

// 根据账号和密码获取账户索引
int get_account_index(int account_number, char *password) {
    int i;
    for (i = 0; i < num_accounts; i++) {
        if (accounts[i].account_number == account_number && strcmp(accounts[i].password, password) == 0) {
            return i;
        }
    }
    return -1;
}

需要注意的是，上述程序仅是一个简单的实现，没有考虑并发和安全性等问题，实际应用中需要进行进一步的完善。