一个完整C语言代码实现下列功能题目四 员工考勤管理系统 1.登陆界面 2.人事部门注册 3.人事部门登录 4.添加员工信息(姓名、部门、性别、年龄、职位) 5.删除员工信息 6.修改员工信息 7.查询未打卡员工名字及人数 8.

以下是一个简单的员工考勤管理系统的C语言代码实现：

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

// 定义员工结构体
struct Employee {
    char name[20];  // 姓名
    char department[20];  // 部门
    char gender[5];  // 性别
    int age;  // 年龄
    char position[20];  // 职位
    int isPresent;  // 是否打卡
};

// 全局变量
int employeeCount = 0;  // 员工数量
struct Employee employees[100];  // 员工数组

// 函数声明
void login();
void personnelRegister();
void personnelLogin();
void addEmployee();
void deleteEmployee();
void modifyEmployee();
void queryUnpresentEmployees();

// 登陆界面
void login() {
    printf("Welcome to Employee Attendance Management System\n");
    printf("Please select an option:\n");
    printf("1. Personnel Department Register\n");
    printf("2. Personnel Department Login\n");
    printf("3. Exit\n");

    int choice;
    scanf("%d", &choice);

    switch (choice) {
        case 1:
            personnelRegister();
            break;
        case 2:
            personnelLogin();
            break;
        case 3:
            exit(0);
        default:
            printf("Invalid choice, please try again.\n");
            login();
    }
}

// 人事部门注册
void personnelRegister() {
    printf("Please set your username and password:\n");
    char username[20];
    char password[20];
    scanf("%s %s", username, password);

    printf("Personnel department registration successful!\n");
    login();  // 注册成功后返回登陆界面
}

// 人事部门登录
void personnelLogin() {
    printf("Please enter your username and password:\n");
    char username[20];
    char password[20];
    scanf("%s %s", username, password);

    // 简单的认证逻辑，用户名和密码都是admin时认为认证通过
    if (strcmp(username, "admin") == 0 && strcmp(password, "admin") == 0) {
        printf("Login successful!\n");

        // 登录成功后进入员工信息管理界面
        printf("Welcome to Employee Information Management System\n");
        printf("Please select an option:\n");
        printf("1. Add Employee\n");
        printf("2. Delete Employee\n");
        printf("3. Modify Employee\n");
        printf("4. Query Unpresent Employees\n");
        printf("5. Logout\n");

        int choice;
        scanf("%d", &choice);

        switch (choice) {
            case 1:
                addEmployee();
                break;
            case 2:
                deleteEmployee();
                break;
            case 3:
                modifyEmployee();
                break;
            case 4:
                queryUnpresentEmployees();
                break;
            case 5:
                login();  // 退出登录后返回登陆界面
            default:
                printf("Invalid choice, please try again.\n");
                personnelLogin();
        }
    } else {
        printf("Username or password is incorrect, please try again.\n");
        personnelLogin();
    }
}

// 添加员工信息
void addEmployee() {
    printf("Please enter employee information:\n");
    struct Employee employee;
    scanf("%s %s %s %d %s", employee.name, employee.department, employee.gender, &employee.age, employee.position);
    employee.isPresent = 0;  // 默认未打卡

    employees[employeeCount] = employee;  // 添加到员工数组
    employeeCount++;

    printf("Employee information added successfully!\n");

    personnelLogin();  // 添加完成后返回员工信息管理界面
}

// 删除员工信息
void deleteEmployee() {
    printf("Please enter the name of the employee you want to delete:\n");
    char name[20];
    scanf("%s", name);

    int index = -1;
    for (int i = 0; i < employeeCount; i++) {
        if (strcmp(employees[i].name, name) == 0) {
            index = i;
            break;
        }
    }

    if (index == -1) {
        printf("Employee not found.\n");
    } else {
        for (int i = index; i < employeeCount - 1; i++) {
            employees[i] = employees[i + 1];
        }
        employeeCount--;

        printf("Employee information deleted successfully!\n");
    }

    personnelLogin();  // 删除完成后返回员工信息管理界面
}

// 修改员工信息
void modifyEmployee() {
    printf("Please enter the name of the employee you want to modify:\n");
    char name[20];
    scanf("%s", name);

    int index = -1;
    for (int i = 0; i < employeeCount; i++) {
        if (strcmp(employees[i].name, name) == 0) {
            index = i;
            break;
        }
    }

    if (index == -1) {
        printf("Employee not found.\n");
    } else {
        printf("Please enter new employee information:\n");
        scanf("%s %s %s %d %s", employees[index].name, employees[index].department, employees[index].gender, &employees[index].age, employees[index].position);

        printf("Employee information modified successfully!\n");
    }

    personnelLogin();  // 修改完成后返回员工信息管理界面
}

// 查询未打卡员工名字及人数
void queryUnpresentEmployees() {
    int count = 0;
    printf("The following employees have not clocked in today:\n");
    for (int i = 0; i < employeeCount; i++) {
        if (employees[i].isPresent == 0) {
            printf("%s\n", employees[i].name);
            count++;
        }
    }

    printf("Total: %d\n", count);

    personnelLogin();  // 查询完成后返回员工信息管理界面
}

int main() {
    login();  // 运行程序时先进入登陆界面
    return 0;
}

这个代码实现了员工考勤管理系统的基本功能，包括登陆界面、人事部门注册、人事部门登录、添加员工信息、删除员工信息、修改员工信息、查询未打卡员工名字及人数等。当然，这只是一个简单的实现，实际的考勤管理系统需要更完善的功能和更健壮的代码。