用c语言写职工信息管理系统设计 总体需求 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）。所有信息用文件保存。 功能要求： (1)系统以菜单方式工作 (2）职工信息录入功能（职工信息用文件保存)——输入 (3)职工信息浏览功能——输出 (4)查询或排序功能：按工资查询，按学历查询等 (5）职工信息删除功能 (6）职工信息修改功能 （7）按照某种信息进行排序显示（比如工资从低到高等)

这是一个比较典型的文件处理程序，需要用到结构体和文件操作函数，以下是一个简单的实现：

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

#define MAX_WORKER 100

typedef struct {
    int id;
    char name[20];
    char gender[5];
    char birth[20];
    char edu[20];
    char position[20];
    float salary;
    char address[50];
    char phone[20];
} Worker;

Worker workers[MAX_WORKER];
int worker_count = 0;

void load_workers() {
    FILE *fp = fopen("workers.dat", "rb");
    if (fp == NULL) {
        return;
    }
    while (fread(&workers[worker_count], sizeof(Worker), 1, fp) == 1) {
        worker_count++;
    }
    fclose(fp);
}

void save_workers() {
    FILE *fp = fopen("workers.dat", "wb");
    if (fp == NULL) {
        printf("Error: cannot open file.\n");
        return;
    }
    fwrite(workers, sizeof(Worker), worker_count, fp);
    fclose(fp);
}

int find_worker_by_id(int id) {
    for (int i = 0; i < worker_count; i++) {
        if (workers[i].id == id) {
            return i;
        }
    }
    return -1;
}

void add_worker() {
    if (worker_count >= MAX_WORKER) {
        printf("Error: worker count exceeds maximum.\n");
        return;
    }
    Worker worker;
    printf("Enter worker id: ");
    scanf("%d", &worker.id);
    if (find_worker_by_id(worker.id) >= 0) {
        printf("Error: worker id already exists.\n");
        return;
    }
    printf("Enter worker name: ");
    scanf("%s", worker.name);
    printf("Enter worker gender: ");
    scanf("%s", worker.gender);
    printf("Enter worker birth: ");
    scanf("%s", worker.birth);
    printf("Enter worker edu: ");
    scanf("%s", worker.edu);
    printf("Enter worker position: ");
    scanf("%s", worker.position);
    printf("Enter worker salary: ");
    scanf("%f", &worker.salary);
    printf("Enter worker address: ");
    scanf("%s", worker.address);
    printf("Enter worker phone: ");
    scanf("%s", worker.phone);
    workers[worker_count] = worker;
    worker_count++;
    save_workers();
    printf("Worker added successfully.\n");
}

void print_worker(int index) {
    printf("%5d %10s %5s %12s %10s %10s %8.2f %20s %15s\n",
           workers[index].id, workers[index].name, workers[index].gender,
           workers[index].birth, workers[index].edu, workers[index].position,
           workers[index].salary, workers[index].address, workers[index].phone);
}

void list_all_workers() {
    printf("%5s %10s %5s %12s %10s %10s %8s %20s %15s\n",
           "ID", "Name", "Gender", "Birth", "Edu", "Position", "Salary", "Address", "Phone");
    for (int i = 0; i < worker_count; i++) {
        print_worker(i);
    }
}

void query_by_salary() {
    float min_salary, max_salary;
    printf("Enter the minimum salary: ");
    scanf("%f", &min_salary);
    printf("Enter the maximum salary: ");
    scanf("%f", &max_salary);
    printf("%5s %10s %5s %12s %10s %10s %8s %20s %15s\n",
           "ID", "Name", "Gender", "Birth", "Edu", "Position", "Salary", "Address", "Phone");
    for (int i = 0; i < worker_count; i++) {
        if (workers[i].salary >= min_salary && workers[i].salary <= max_salary) {
            print_worker(i);
        }
    }
}

void query_by_edu() {
    char edu[20];
    printf("Enter the education: ");
    scanf("%s", edu);
    printf("%5s %10s %5s %12s %10s %10s %8s %20s %15s\n",
           "ID", "Name", "Gender", "Birth", "Edu", "Position", "Salary", "Address", "Phone");
    for (int i = 0; i < worker_count; i++) {
        if (strcmp(workers[i].edu, edu) == 0) {
            print_worker(i);
        }
    }
}

void delete_worker() {
    int id;
    printf("Enter worker id to delete: ");
    scanf("%d", &id);
    int index = find_worker_by_id(id);
    if (index < 0) {
        printf("Error: worker not found.\n");
        return;
    }
    for (int i = index; i < worker_count - 1; i++) {
        workers[i] = workers[i + 1];
    }
    worker_count--;
    save_workers();
    printf("Worker deleted successfully.\n");
}

void modify_worker() {
    int id;
    printf("Enter worker id to modify: ");
    scanf("%d", &id);
    int index = find_worker_by_id(id);
    if (index < 0) {
        printf("Error: worker not found.\n");
        return;
    }
    printf("Enter worker name (old: %s): ", workers[index].name);
    scanf("%s", workers[index].name);
    printf("Enter worker gender (old: %s): ", workers[index].gender);
    scanf("%s", workers[index].gender);
    printf("Enter worker birth (old: %s): ", workers[index].birth);
    scanf("%s", workers[index].birth);
    printf("Enter worker edu (old: %s): ", workers[index].edu);
    scanf("%s", workers[index].edu);
    printf("Enter worker position (old: %s): ", workers[index].position);
    scanf("%s", workers[index].position);
    printf("Enter worker salary (old: %.2f): ", workers[index].salary);
    scanf("%f", &workers[index].salary);
    printf("Enter worker address (old: %s): ", workers[index].address);
    scanf("%s", workers[index].address);
    printf("Enter worker phone (old: %s): ", workers[index].phone);
    scanf("%s", workers[index].phone);
    save_workers();
    printf("Worker modified successfully.\n");
}

void sort_by_salary() {
    for (int i = 0; i < worker_count - 1; i++) {
        for (int j = i + 1; j < worker_count; j++) {
            if (workers[i].salary > workers[j].salary) {
                Worker temp = workers[i];
                workers[i] = workers[j];
                workers[j] = temp;
            }
        }
    }
    printf("%5s %10s %5s %12s %10s %10s %8s %20s %15s\n",
           "ID", "Name", "Gender", "Birth", "Edu", "Position", "Salary", "Address", "Phone");
    for (int i = 0; i < worker_count; i++) {
        print_worker(i);
    }
}

void menu() {
    printf("=== Worker Management System ===\n");
    printf("1. Add worker\n");
    printf("2. List all workers\n");
    printf("3. Query by salary\n");
    printf("4. Query by education\n");
    printf("5. Delete worker\n");
    printf("6. Modify worker\n");
    printf("7. Sort by salary\n");
    printf("0. Exit\n");
    printf("Enter your choice: ");
}

int main() {
    load_workers();
    while (1) {
        menu();
        int choice;
        scanf("%d", &choice);
        switch (choice) {
            case 1:
                add_worker();
                break;
            case 2:
                list_all_workers();
                break;
            case 3:
                query_by_salary();
                break;
            case 4:
                query_by_edu();
                break;
            case 5:
                delete_worker();
                break;
            case 6:
                modify_worker();
                break;
            case 7:
                sort_by_salary();
                break;
            case 0:
                exit(0);
            default:
                printf("Invalid choice.\n");
        }
    }
    return 0;
}

注意，这个程序使用的是二进制文件，而不是文本文件，因此不能用普通的文本编辑器打开和查看。如果要查看可以使用二进制编辑器或者专门的文件查看工具。另外，由于没有进行输入格式验证和异常处理，如果输入错误可能导致程序崩溃或者出现不可预期的行为。在实际使用中需要根据实际情况进行修改和完善。