(3)职工信息管理职工信息包括职工号、姓名、性别、出生年月、学历、职务、工资、住址、电话等(职工号不重复)，职工信息管理，可具有以下功能:职工信息录入、输出、查询、删除、修改、数据保存、文件打开等.C语言实现代码

以下是一个简单的职工信息管理系统的 C 语言实现代码，包括了职工信息的录入、输出、查询、删除、修改、数据保存、文件打开等功能。

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

#define MAX_LEN 50 // 定义字符串最大长度

// 声明结构体类型
typedef struct {
    int id; // 职工号
    char name[MAX_LEN]; // 姓名
    char gender[MAX_LEN]; // 性别
    char birthdate[MAX_LEN]; // 出生年月
    char education[MAX_LEN]; // 学历
    char position[MAX_LEN]; // 职务
    float salary; // 工资
    char address[MAX_LEN]; // 住址
    char phone[MAX_LEN]; // 电话
} Employee;

// 声明函数
void menu();
void input(Employee *emp);
void output(Employee *emp);
void query(Employee *emp, int n);
void delete(Employee *emp, int n);
void modify(Employee *emp, int n);
void save(Employee *emp, int n);
void open(Employee *emp, int *n);

int main()
{
    Employee emp[100]; // 最多存储 100 个职工信息
    int n = 0; // 当前职工信息数量
    int choice;

    do {
        menu();
        scanf("%d", &choice);
        switch (choice) {
        case 1:
            input(&emp[n]);
            n++;
            break;
        case 2:
            output(emp);
            break;
        case 3:
            query(emp, n);
            break;
        case 4:
            delete(emp, n);
            n--;
            break;
        case 5:
            modify(emp, n);
            break;
        case 6:
            save(emp, n);
            break;
        case 7:
            open(emp, &n);
            break;
        case 8:
            printf("Goodbye!\n");
            break;
        default:
            printf("Invalid choice! Please try again.\n");
            break;
        }
    } while (choice != 8);

    return 0;
}

// 显示菜单
void menu()
{
    printf("\n");
    printf("========== Employee Management System ==========\n");
    printf("1. Input employee information\n");
    printf("2. Output employee information\n");
    printf("3. Query employee information\n");
    printf("4. Delete employee information\n");
    printf("5. Modify employee information\n");
    printf("6. Save employee information to file\n");
    printf("7. Open employee information from file\n");
    printf("8. Exit\n");
    printf("Please enter your choice: ");
}

// 录入职工信息
void input(Employee *emp)
{
    printf("Please enter employee information:\n");
    printf("ID: ");
    scanf("%d", &(emp->id));
    printf("Name: ");
    scanf("%s", emp->name);
    printf("Gender: ");
    scanf("%s", emp->gender);
    printf("Birthdate: ");
    scanf("%s", emp->birthdate);
    printf("Education: ");
    scanf("%s", emp->education);
    printf("Position: ");
    scanf("%s", emp->position);
    printf("Salary: ");
    scanf("%f", &(emp->salary));
    printf("Address: ");
    scanf("%s", emp->address);
    printf("Phone: ");
    scanf("%s", emp->phone);
}

// 输出职工信息
void output(Employee *emp)
{
    printf("Employee information:\n");
    printf("ID\tName\tGender\tBirthdate\tEducation\tPosition\tSalary\tAddress\tPhone\n");
    for (int i = 0; i < MAX_LEN; i++) {
        printf("-");
    }
    printf("\n");
    for (int i = 0; i < MAX_LEN; i++) {
        if (emp[i].id == 0) {
            break;
        }
        printf("%d\t%s\t%s\t%s\t%s\t%s\t%.2f\t%s\t%s\n", emp[i].id, emp[i].name, emp[i].gender, emp[i].birthdate, emp[i].education, emp[i].position, emp[i].salary, emp[i].address, emp[i].phone);
    }
}

// 查询职工信息
void query(Employee *emp, int n)
{
    int id;
    printf("Please enter the ID of the employee you want to query: ");
    scanf("%d", &id);
    for (int i = 0; i < n; i++) {
        if (emp[i].id == id) {
            printf("Employee information:\n");
            printf("ID\tName\tGender\tBirthdate\tEducation\tPosition\tSalary\tAddress\tPhone\n");
            for (int j = 0; j < MAX_LEN; j++) {
                printf("-");
            }
            printf("\n");
            printf("%d\t%s\t%s\t%s\t%s\t%s\t%.2f\t%s\t%s\n", emp[i].id, emp[i].name, emp[i].gender, emp[i].birthdate, emp[i].education, emp[i].position, emp[i].salary, emp[i].address, emp[i].phone);
            return;
        }
    }
    printf("Employee not found!\n");
}

// 删除职工信息
void delete(Employee *emp, int n)
{
    int id;
    printf("Please enter the ID of the employee you want to delete: ");
    scanf("%d", &id);
    for (int i = 0; i < n; i++) {
        if (emp[i].id == id) {
            for (int j = i; j < n-1; j++) {
                emp[j] = emp[j+1];
            }
            emp[n-1].id = 0;
            printf("Employee information deleted successfully!\n");
            return;
        }
    }
    printf("Employee not found!\n");
}

// 修改职工信息
void modify(Employee *emp, int n)
{
    int id;
    printf("Please enter the ID of the employee you want to modify: ");
    scanf("%d", &id);
    for (int i = 0; i < n; i++) {
        if (emp[i].id == id) {
            printf("Please enter the new information for the employee:\n");
            printf("Name: ");
            scanf("%s", emp[i].name);
            printf("Gender: ");
            scanf("%s", emp[i].gender);
            printf("Birthdate: ");
            scanf("%s", emp[i].birthdate);
            printf("Education: ");
            scanf("%s", emp[i].education);
            printf("Position: ");
            scanf("%s", emp[i].position);
            printf("Salary: ");
            scanf("%f", &(emp[i].salary));
            printf("Address: ");
            scanf("%s", emp[i].address);
            printf("Phone: ");
            scanf("%s", emp[i].phone);
            printf("Employee information modified successfully!\n");
            return;
        }
    }
    printf("Employee not found!\n");
}

// 保存职工信息到文件
void save(Employee *emp, int n)
{
    FILE *fp;
    fp = fopen("employee.txt", "w");
    if (fp == NULL) {
        printf("Error opening file!\n");
        return;
    }
    for (int i = 0; i < n; i++) {
        fprintf(fp, "%d\t%s\t%s\t%s\t%s\t%s\t%.2f\t%s\t%s\n", emp[i].id, emp[i].name, emp[i].gender, emp[i].birthdate, emp[i].education, emp[i].position, emp[i].salary, emp[i].address, emp[i].phone);
    }
    fclose(fp);
    printf("Employee information saved to file!\n");
}

// 从文件中打开职工信息
void open(Employee *emp, int *n)
{
    FILE *fp;
    fp = fopen("employee.txt", "r");
    if (fp == NULL) {
        printf("Error opening file!\n");
        return;
    }
    *n = 0;
    while (fscanf(fp, "%d\t%s\t%s\t%s\t%s\t%s\t%f\t%s\t%s\n", &(emp[*n].id), emp[*n].name, emp[*n].gender, emp[*n].birthdate, emp[*n].education, emp[*n].position, &(emp[*n].salary), emp[*n].address, emp[*n].phone) != EOF) {
        (*n)++;
    }
    fclose(fp);
    printf("Employee information opened from file!\n");
}

上述代码实现了一个简单的职工信息管理系统，包括了职工信息的录入、输出、查询、删除、修改、数据保存、文件打开等功能。