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）。用c语言实现

以下是一个简单的职工信息管理系统设计，实现了上述功能要求：

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

#define MAX_WORKERS 100 // 最大职工数
#define MAX_NAME 20 // 姓名最大长度
#define MAX_ADDRESS 50 // 地址最大长度
#define FILENAME "workers.dat" // 保存职工信息的文件名

// 职工信息结构体
typedef struct {
    int id; // 职工号
    char name[MAX_NAME]; // 姓名
    char sex[4]; // 性别
    char birth[11]; // 出生年月，格式为 yyyy-mm-dd
    char education[10]; // 学历
    char position[20]; // 职务
    float salary; // 工资
    char address[MAX_ADDRESS]; // 住址
    char phone[20]; // 电话
} Worker;

// 全局变量，保存职工信息
Worker workers[MAX_WORKERS];
int num_workers = 0;

// 菜单函数
void menu() {
    printf("\n");
    printf("职工信息管理系统\n");
    printf("-----------------\n");
    printf("1. 录入职工信息\n");
    printf("2. 浏览职工信息\n");
    printf("3. 按工资查询\n");
    printf("4. 按学历查询\n");
    printf("5. 删除职工信息\n");
    printf("6. 修改职工信息\n");
    printf("7. 按工资排序\n");
    printf("8. 退出\n");
    printf("-----------------\n");
    printf("请选择操作：");
}

// 录入职工信息函数
void add_worker() {
    if (num_workers == MAX_WORKERS) {
        printf("职工信息已满，无法继续添加！\n");
        return;
    }
    Worker worker;
    printf("请输入职工号：");
    scanf("%d", &worker.id);
    for (int i = 0; i < num_workers; i++) {
        if (workers[i].id == worker.id) {
            printf("职工号重复，无法添加！\n");
            return;
        }
    }
    printf("请输入姓名：");
    scanf("%s", worker.name);
    printf("请输入性别：");
    scanf("%s", worker.sex);
    printf("请输入出生年月（格式为 yyyy-mm-dd）：");
    scanf("%s", worker.birth);
    printf("请输入学历：");
    scanf("%s", worker.education);
    printf("请输入职务：");
    scanf("%s", worker.position);
    printf("请输入工资：");
    scanf("%f", &worker.salary);
    printf("请输入住址：");
    scanf("%s", worker.address);
    printf("请输入电话：");
    scanf("%s", worker.phone);
    workers[num_workers] = worker;
    num_workers++;
    printf("职工信息添加成功！\n");
}

// 浏览职工信息函数
void show_workers() {
    if (num_workers == 0) {
        printf("没有职工信息！\n");
        return;
    }
    printf("|%-10s|%-10s|%-6s|%-12s|%-8s|%-12s|%-10s|%-20s|%-20s|\n", "职工号", "姓名", "性别", "出生年月", "学历", "职务", "工资", "住址", "电话");
    for (int i = 0; i < num_workers; i++) {
        printf("|%-10d|%-10s|%-6s|%-12s|%-8s|%-12s|%-10.2f|%-20s|%-20s|\n", workers[i].id, workers[i].name, workers[i].sex, workers[i].birth, workers[i].education, workers[i].position, workers[i].salary, workers[i].address, workers[i].phone);
    }
}

// 按工资查询函数
void search_by_salary() {
    float min_salary, max_salary;
    printf("请输入最低工资：");
    scanf("%f", &min_salary);
    printf("请输入最高工资：");
    scanf("%f", &max_salary);
    printf("|%-10s|%-10s|%-6s|%-12s|%-8s|%-12s|%-10s|%-20s|%-20s|\n", "职工号", "姓名", "性别", "出生年月", "学历", "职务", "工资", "住址", "电话");
    for (int i = 0; i < num_workers; i++) {
        if (workers[i].salary >= min_salary && workers[i].salary <= max_salary) {
            printf("|%-10d|%-10s|%-6s|%-12s|%-8s|%-12s|%-10.2f|%-20s|%-20s|\n", workers[i].id, workers[i].name, workers[i].sex, workers[i].birth, workers[i].education, workers[i].position, workers[i].salary, workers[i].address, workers[i].phone);
        }
    }
}

// 按学历查询函数
void search_by_education() {
    char education[10];
    printf("请输入学历：");
    scanf("%s", education);
    printf("|%-10s|%-10s|%-6s|%-12s|%-8s|%-12s|%-10s|%-20s|%-20s|\n", "职工号", "姓名", "性别", "出生年月", "学历", "职务", "工资", "住址", "电话");
    for (int i = 0; i < num_workers; i++) {
        if (strcmp(workers[i].education, education) == 0) {
            printf("|%-10d|%-10s|%-6s|%-12s|%-8s|%-12s|%-10.2f|%-20s|%-20s|\n", workers[i].id, workers[i].name, workers[i].sex, workers[i].birth, workers[i].education, workers[i].position, workers[i].salary, workers[i].address, workers[i].phone);
        }
    }
}

// 删除职工信息函数
void delete_worker() {
    int id;
    printf("请输入要删除的职工号：");
    scanf("%d", &id);
    int index = -1; // 要删除的职工在数组中的下标
    for (int i = 0; i < num_workers; i++) {
        if (workers[i].id == id) {
            index = i;
            break;
        }
    }
    if (index == -1) {
        printf("没有找到要删除的职工！\n");
        return;
    }
    for (int i = index; i < num_workers - 1; i++) {
        workers[i] = workers[i + 1];
    }
    num_workers--;
    printf("职工信息删除成功！\n");
}

// 修改职工信息函数
void modify_worker() {
    int id;
    printf("请输入要修改的职工号：");
    scanf("%d", &id);
    int index = -1; // 要修改的职工在数组中的下标
    for (int i = 0; i < num_workers; i++) {
        if (workers[i].id == id) {
            index = i;
            break;
        }
    }
    if (index == -1) {
        printf("没有找到要修改的职工！\n");
        return;
    }
    printf("请输入姓名（原值为 %s）：", workers[index].name);
    scanf("%s", workers[index].name);
    printf("请输入性别（原值为 %s）：", workers[index].sex);
    scanf("%s", workers[index].sex);
    printf("请输入出生年月（格式为 yyyy-mm-dd，原值为 %s）：", workers[index].birth);
    scanf("%s", workers[index].birth);
    printf("请输入学历（原值为 %s）：", workers[index].education);
    scanf("%s", workers[index].education);
    printf("请输入职务（原值为 %s）：", workers[index].position);
    scanf("%s", workers[index].position);
    printf("请输入工资（原值为 %.2f）：", workers[index].salary);
    scanf("%f", &workers[index].salary);
    printf("请输入住址（原值为 %s）：", workers[index].address);
    scanf("%s", workers[index].address);
    printf("请输入电话（原值为 %s）：", workers[index].phone);
    scanf("%s", workers[index].phone);
    printf("职工信息修改成功！\n");
}

// 按工资排序函数
void sort_by_salary() {
    for (int i = 0; i < num_workers - 1; i++) {
        for (int j = i + 1; j < num_workers; j++) {
            if (workers[i].salary > workers[j].salary) {
                Worker temp = workers[i];
                workers[i] = workers[j];
                workers[j] = temp;
            }
        }
    }
    printf("按工资排序成功！\n");
}

// 保存职工信息到文件函数
void save_workers() {
    FILE *fp;
    fp = fopen(FILENAME, "wb");
    if (fp == NULL) {
        printf("文件打开失败！\n");
        return;
    }
    fwrite(workers, sizeof(Worker), num_workers, fp);
    fclose(fp);
    printf("职工信息保存成功！\n");
}

// 从文件中读取职工信息函数
void load_workers() {
    FILE *fp;
    fp = fopen(FILENAME, "rb");
    if (fp == NULL) {
        printf("文件打开失败！\n");
        return;
    }
    num_workers = fread(workers, sizeof(Worker), MAX_WORKERS, fp);
    fclose(fp);
    printf("职工信息加载成功！\n");
}

int main() {
    load_workers(); // 程序运行前从文件中读取职工信息
    while (1) {
        menu();
        int choice;
        scanf("%d", &choice);
        switch (choice) {
            case 1:
                add_worker();
                break;
            case 2:
                show_workers();
                break;
            case 3:
                search_by_salary();
                break;
            case 4:
                search_by_education();
                break;
            case 5:
                delete_worker();
                break;
            case 6:
                modify_worker();
                break;
            case 7:
                sort_by_salary();
                break;
            case 8:
                save_workers(); // 程序结束前将职工信息保存到文件
                printf("再见！\n");
                return 0;
            default:
                printf("输入有误，请重新选择！\n");
                break;
        }
    }
}

注意：为了实现职工信息的永久保存，程序运行前会从文件中读取职工信息，程序结束前会将职工信息保存到文件。文件名为 "workers.dat"，可以根据需要更改。