帮我写一个C语言的银行管理系统

好的，下面是一个简单的银行管理系统的C语言代码：

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

#define MAX_ACCOUNTS 100 // 最大账户数量
#define MAX_NAME_LEN 20 // 姓名最大长度
#define MAX_PASSWORD_LEN 20 // 密码最大长度

// 账户结构体
typedef struct Account {
    char name[MAX_NAME_LEN];
    char password[MAX_PASSWORD_LEN];
    float balance;
} Account;

// 全局变量
Account accounts[MAX_ACCOUNTS]; // 所有账户
int num_accounts = 0; // 账户数量

// 显示菜单
void show_menu() {
    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. 修改密码\n");
    printf("6. 删除账户\n");
    printf("7. 退出\n");
}

// 创建账户
void create_account() {
    if (num_accounts >= MAX_ACCOUNTS) {
        printf("无法创建更多账户！\n");
        return;
    }
    printf("请输入姓名：");
    scanf("%s", accounts[num_accounts].name);
    printf("请输入密码：");
    scanf("%s", accounts[num_accounts].password);
    accounts[num_accounts].balance = 0;
    num_accounts++;
    printf("账户创建成功！\n");
}

// 存款
void deposit() {
    char name[MAX_NAME_LEN];
    char password[MAX_PASSWORD_LEN];
    float amount;

    printf("请输入账户名：");
    scanf("%s", name);
    printf("请输入密码：");
    scanf("%s", password);

    // 查找账户
    int index = -1;
    for (int i = 0; i < num_accounts; i++) {
        if (strcmp(name, accounts[i].name) == 0 && strcmp(password, accounts[i].password) == 0) {
            index = i;
            break;
        }
    }
    if (index == -1) {
        printf("账户名或密码错误！\n");
        return;
    }

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

    // 更新余额
    accounts[index].balance += amount;

    printf("存款成功！\n");
}

// 取款
void withdraw() {
    char name[MAX_NAME_LEN];
    char password[MAX_PASSWORD_LEN];
    float amount;

    printf("请输入账户名：");
    scanf("%s", name);
    printf("请输入密码：");
    scanf("%s", password);

    // 查找账户
    int index = -1;
    for (int i = 0; i < num_accounts; i++) {
        if (strcmp(name, accounts[i].name) == 0 && strcmp(password, accounts[i].password) == 0) {
            index = i;
            break;
        }
    }
    if (index == -1) {
        printf("账户名或密码错误！\n");
        return;
    }

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

    // 检查余额是否足够
    if (accounts[index].balance < amount) {
        printf("余额不足！\n");
        return;
    }

    // 更新余额
    accounts[index].balance -= amount;

    printf("取款成功！\n");
}

// 查询余额
void check_balance() {
    char name[MAX_NAME_LEN];
    char password[MAX_PASSWORD_LEN];

    printf("请输入账户名：");
    scanf("%s", name);
    printf("请输入密码：");
    scanf("%s", password);

    // 查找账户
    int index = -1;
    for (int i = 0; i < num_accounts; i++) {
        if (strcmp(name, accounts[i].name) == 0 && strcmp(password, accounts[i].password) == 0) {
            index = i;
            break;
        }
    }
    if (index == -1) {
        printf("账户名或密码错误！\n");
        return;
    }

    printf("余额为：%.2f\n", accounts[index].balance);
}

// 修改密码
void change_password() {
    char name[MAX_NAME_LEN];
    char old_password[MAX_PASSWORD_LEN];
    char new_password[MAX_PASSWORD_LEN];

    printf("请输入账户名：");
    scanf("%s", name);
    printf("请输入旧密码：");
    scanf("%s", old_password);

    // 查找账户
    int index = -1;
    for (int i = 0; i < num_accounts; i++) {
        if (strcmp(name, accounts[i].name) == 0 && strcmp(old_password, accounts[i].password) == 0) {
            index = i;
            break;
        }
    }
    if (index == -1) {
        printf("账户名或密码错误！\n");
        return;
    }

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

    // 更新密码
    strcpy(accounts[index].password, new_password);

    printf("密码修改成功！\n");
}

// 删除账户
void delete_account() {
    char name[MAX_NAME_LEN];
    char password[MAX_PASSWORD_LEN];

    printf("请输入账户名：");
    scanf("%s", name);
    printf("请输入密码：");
    scanf("%s", password);

    // 查找账户
    int index = -1;
    for (int i = 0; i < num_accounts; i++) {
        if (strcmp(name, accounts[i].name) == 0 && strcmp(password, accounts[i].password) == 0) {
            index = i;
            break;
        }
    }
    if (index == -1) {
        printf("账户名或密码错误！\n");
        return;
    }

    // 删除账户
    for (int i = index; i < num_accounts - 1; i++) {
        accounts[i] = accounts[i + 1];
    }
    num_accounts--;

    printf("账户删除成功！\n");
}

int main() {
    int choice;

    while (1) {
        show_menu();
        printf("请选择操作（1-7）：");
        scanf("%d", &choice);

        switch (choice) {
            case 1:
                create_account();
                break;
            case 2:
                deposit();
                break;
            case 3:
                withdraw();
                break;
            case 4:
                check_balance();
                break;
            case 5:
                change_password();
                break;
            case 6:
                delete_account();
                break;
            case 7:
                printf("谢谢使用！\n");
                exit(0);
            default:
                printf("无效的选择！\n");
        }
    }

    return 0;
}

该银行管理系统支持以下操作：

1. 创建账户
2. 存款
3. 取款
4. 查询余额
5. 修改密码
6. 删除账户
7. 退出