程序设计停车场管理系统普通用户管理层用户c语言

以下是一个简单的停车场管理系统的普通用户管理层用户的C语言代码示例：

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

#define MAX_USERS 100
#define MAX_NAME_LENGTH 20
#define MAX_PASSWORD_LENGTH 20

struct User {
    char name[MAX_NAME_LENGTH];
    char password[MAX_PASSWORD_LENGTH];
};

struct User users[MAX_USERS];
int num_users = 0;

void register_user() {
    if (num_users >= MAX_USERS) {
        printf("ERROR: Maximum number of users reached.\n");
        return;
    }

    struct User user;

    printf("Enter your name: ");
    scanf("%s", user.name);

    printf("Enter your password: ");
    scanf("%s", user.password);

    users[num_users] = user;
    num_users++;

    printf("User registered successfully.\n");
}

void login() {
    char name[MAX_NAME_LENGTH];
    char password[MAX_PASSWORD_LENGTH];

    printf("Enter your name: ");
    scanf("%s", name);

    printf("Enter your password: ");
    scanf("%s", password);

    for (int i = 0; i < num_users; i++) {
        if (strcmp(users[i].name, name) == 0 && strcmp(users[i].password, password) == 0) {
            printf("Login successful.\n");
            return;
        }
    }

    printf("ERROR: Invalid name or password.\n");
}

int main() {
    int choice;

    while (1) {
        printf("1. Register\n");
        printf("2. Login\n");
        printf("3. Exit\n");
        printf("Enter your choice: ");
        scanf("%d", &choice);

        switch (choice) {
            case 1:
                register_user();
                break;
            case 2:
                login();
                break;
            case 3:
                exit(0);
            default:
                printf("Invalid choice.\n");
        }
    }

    return 0;
}

此代码实现了两个功能：用户注册和用户登录。每个用户都有一个名字和密码，这些信息存储在 `users` 数组中。程序可以处理最多100个用户。用户可以通过输入他们的名字和密码进行登录。如果登录成功，程序将打印“登录成功”，否则将打印“无效的用户名或密码”。