程序代码：

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


//职工信息结构体
struct employee_Info
{
char num;
char name[20];
char sex[20];
int age;
char xueli[30];
int wage;
char tel[20];
};
typedef struct employee_Info EMP;

//链表结构体节点
struct message_Info
{
EMP employee_data;
struct message_Info *next;
};
typedef struct message_Info MES;

//录入数据模块
void Creat_linklist (MES *head)
{
MES *tail,*pnew;
int i,m;
printf("请输入需要创建信息的职工人数：");
scanf("%d",&m);

tail=head;

printf("请输入职工信工信息：\n");
for (i=0;i<m;i++)
{

pnew=(MES*)malloc(sizeof(MES));
if(head==NULL)
{
printf("no enough memory!\n");
exit (0);
}
printf("请输入职工号：");
scanf("%d",&pnew->employee_data.num);
printf("请输入姓名：");
scanf("%s",&pnew->employee_data.name);
printf("请输入性别：");
scanf("%s",&pnew->employee_data.sex);
printf("请输入年龄：");
scanf("%d",&pnew->employee_data.age);
printf("请输入学历：");
scanf("%s",&pnew->employee_data.xueli);
printf("请输入工资：");
scanf("%d",&pnew->employee_data.wage);
printf("请输入电话：");
scanf("%s",&pnew->employee_data.tel);
pnew->next=NULL;

tail->next=pnew;
tail=pnew;
}
}


//浏览数据
void Display_Linklist(MES *head)
{
MES *p;
for(p=head->next;p!=NULL;p=p->next)
{
printf("职工号：%d\n",p->employee_data.num);
printf("姓名：%s\n",p->employee_data.name);
printf("性别：%s\n",p->employee_data.sex);
printf("年龄：%d\n",p->employee_data.age);
printf("学历：%s\n",p->employee_data.xueli);
printf("工资：%d\n",p->employee_data.wage);
printf("电话：%s\n",p->employee_data.tel);
}
printf("\n");
}


//删除数据
void Delete_Linklist (MES *head)
{
MES *p,*q;
int i,j;

printf("请输入你想要删除的职工号：");
scanf("%d",&i);
if(i==0)
  return;

p=head;
for(j=1;j<i&&p->next!=NULL;j++)
   p=p->next;
if(p->next==NULL)
{
printf("查无此职工号！");
exit(0);
}

q=p->next;
p->next=q->next;
free(q);
}

//添加数据
void Insert_Linklist (MES *head)
{
MES *p,*pnew;

p=head;
pnew=(MES*)malloc(sizeof(MES));
if(pnew==NULL)
{
printf("no enough memory!\n");
exit (0);
}

printf("请输入职工号：");
scanf("%d",&pnew->employee_data.num);
printf("请输入姓名：");
scanf("%s",&pnew->employee_data.name);
printf("请输入性别：");
scanf("%s",&pnew->employee_data.sex);
printf("请输入年龄：");
scanf("%d",&pnew->employee_data.age);
printf("请输入学历：");
scanf("%s",&pnew->employee_data.xueli);
printf("请输入工资：");
scanf("%d",&pnew->employee_data.wage);
printf("请输入电话：");
scanf("%s",&pnew->employee_data.tel);
pnew->next=NULL;

pnew->next=p->next;
p->next=pnew;
}


//修改数据
void Modify (MES *head)
{
MES *p;
int a;
printf("请输入你想修改的职工号：");
scanf("%d",&a);

for(p=head->next;p!=NULL;p=p->next)
{
  if(p->employee_data.num==a)
  {
  printf("已找到职工信息：\n");
  printf("原职工号：%d,现职工号：",p->employee_data.num);
  scanf("%d",&p->employee_data.num);
  printf("原职工姓名：%s,现职工姓名：",p->employee_data.name);
  scanf("%s",&p->employee_data.name);
  printf("原职性别：%s,现职性别：",p->employee_data.sex);
  scanf("%s",&p->employee_data.sex);
  printf("原职工年龄：%d,现职工年龄：",p->employee_data.age);
  scanf("%d",&p->employee_data.age);
  printf("原职工学历：%s,现职工学历：",p->employee_data.xueli);
  scanf("%s",&p->employee_data.xueli);
  printf("原职工工资：%d,现职工工资：",p->employee_data.wage);
  scanf("%d",&p->employee_data.wage);
  printf("原职工电话：%s,现职工电话：",p->employee_data.tel);
  scanf("%s",&p->employee_data.tel);
  }
  if(p==NULL)
     printf("对不起，您需要修改的信息不存在！");
}
}



//按工号查找数据
void Search_num (MES *head)
{
  MES *p;
  int a;
  printf("请输入你要查询的职工号：");
  scanf("%d",&a);

  for(p=head->next;p!=NULL;p=p->next)
  {
     if(p->employee_data.num==a)
         printf("已找到，其记录为：\n");
     printf("工号：%d\n",p->employee_data.num);
     printf("姓名：%s\n",p->employee_data.name);
     printf("性别：%s\n",p->employee_data.sex);
     printf("年龄：%d\n",p->employee_data.age);
     printf("学历：%s\n",p->employee_data.xueli);
     printf("工资：%d\n",p->employee_data.wage);
     printf("电话：%s\n",p->employee_data.tel);
  }

  if(p==NULL)
      printf("对不起，查无此人！");

}


//按姓名查找数据
void Search_name (MES *head)
{
  MES *p;
  char name[20];
  printf("请输入你要查询的职工姓名：");
  scanf("%s",&name);

  for(p=head->next;p!=NULL;p=p->next)
  {
     if(p->employee_data.num==name)
         printf("已找到，其记录为：\n");
     printf("工号：%d\n",p->employee_data.num);
     printf("姓名：%s\n",p->employee_data.name);
     printf("性别：%s\n",p->employee_data.sex);
     printf("年龄：%d\n",p->employee_data.age);
     printf("学历：%s\n",p->employee_data.xueli);
     printf("工资：%d\n",p->employee_data.wage);
     printf("电话：%s\n",p->employee_data.tel);
  }

  if(p==NULL)
      printf("对不起，查无此人！");

}





//写入文件
void Write_file (MES *head)
{
   MES  *p;
   FILE *fp;

   if((fp=fopen("职工管理系统.dat","wb"))==NULL)
   {
      printf("无法打开文件！");
      exit(0);
   }

   for(p=head->next;p!=NULL;p=p->next)
   {
   fprintf(fp,"%d,%s,%s,%d,%s,%d,%s",p->employee_data.num,p->employee_data.name,p->employee_data.sex,
       p->employee_data.age,p->employee_data.xueli,p->employee_data.wage,p->employee_data.tel);

   }
   fclose (fp);
}

//显示数据
void Read_file (MES *head)
{
   MES  *p;
   FILE *fp;

   if((fp=fopen("职工管理系统.dat","rb"))==NULL)
   {
      printf("无法打开文件！");
      exit(0);
   }

   for(p=head->next;p!=NULL;p=p->next)
      fscanf(fp,"%d,%s,%s,%d,%s,%d,%s",p->employee_data.num,p->employee_data.name,p->employee_data.sex,
      p->employee_data.age,p->employee_data.xueli,p->employee_data.wage,p->employee_data.tel);

   if(p=NULL)
      fscanf(fp,"%d,%s,%s,%d,%s,%d,%s",p->employee_data.num,p->employee_data.name,p->employee_data.sex,
      p->employee_data.age,p->employee_data.xueli,p->employee_data.wage,p->employee_data.tel);

   fclose (fp);

   for(p=head->next;p!=NULL;p=p->next)
   {
    printf("工号：%d\n",p->employee_data.num);
    printf("姓名：%s\n",p->employee_data.name);
    printf("性别：%s\n",p->employee_data.sex);
    printf("年龄：%d\n",p->employee_data.age);
    printf("学历：%s\n",p->employee_data.xueli);
    printf("工资：%d\n",p->employee_data.wage);
    printf("电话：%s\n",p->employee_data.tel);
   }
}






//主函数
void main ()
{
  MES *head;
  int n;

head=(MES *)malloc(sizeof(MES));
if(head==NULL)
{
printf("no enough memory!\n");
exit (0);
}
head->next=NULL;

while (1)
{
printf("◤▔▔▔▔▔欢迎进入职工信息管理系统▔▔▔▔▔◥\n");
printf("              1.录入职工信息\n");
printf("              2.浏览职工信息\n");
printf("              3.删除职工信息\n");
printf("              4.添加职工信息\n");
printf("              5.修改职工信息\n");
printf("              6.按工号查询职工信息\n");
printf("              7.按姓名查询职工信息\n");
printf("              8.退出\n");
printf("              9.文件显示职工信息\n");
printf("◣▁▁▁▁▁▁▁▁▁谢谢使用▁▁▁▁▁▁▁▁▁◢\n");


printf("请输入你想要执行的功能代号：");
scanf("%d",&n);

switch (n)
{
case 1:Creat_linklist (head);
       Write_file (head);
       break;
case 2:Display_Linklist (head);
       break;
case 3:Delete_Linklist (head);
       break;
case 4:Insert_Linklist (head);
       break;
case 5:Modify (head);
       break;
case 6:Search_num (head);
       break;
case 7:Search_name (head);
       break;
case 8:printf("谢谢使用！");
       break;
case 9:Read_file (head);
       break;
}
      
}
}