求大佬帮忙看看修改一下，用C语言编一个职工档案管理系统

[azcrazy]

#include<stdio.h>
struct staff
{
char name[8];
char sex[10];
char tel[15];
char num[10];
char bir[15];
char addr[50];
char dep[10];
char pos[10];
char money[10];
}worker;
char filename[20]={"123456"};
void *fp;
void creat();
void browse();
void search1();
void search2();
void append();
void modify();
void del();

void main()
{
int m;
a:
while(1)
{
printf("***********************************************\n");
printf("**********欢迎进入职工档案管理系统*************\n");
printf("***********************************************\n");
printf("* 1存入档案 *\n");
printf("* 2添加信息 *\n");
printf("* 3根据姓名查询 *\n");
printf("* 4根据工号查询 *\n");
printf("* 5修改信息(需要验证身份) *\n");
printf("* 6删除信息 *\n");
printf("* 7浏览信息 *\n");
printf("***********************************************\n");
printf("选择功能(1-8):[ ]\b\b");
scanf("%d",&m);
if(m>=1&&m<=8&&m!=5)
{
switch(m)
{
case 1:
creat();
break;
case 2:
append();
break;
case 3:
search1();
break;
case 4:
search2();
break;
case 6:
del();
break;
case 7:
browse();
break;
}
printf("\n\n操作完毕，请再次选择！");
goto a;
}
if(m==5)
{
int i;
printf("请输入密码(初始密码为12450):");
scanf("%d",&i);
while(i!=12450)
{
printf("密码错误，你是主人大人吗？！？！:");
scanf("%d",&i);
}
printf("成功登入！");
printf("\n");
modify();
printf("\n\n操作完毕，请再次选择!");
}
else
printf("选择错误，请再次选择!");
}
}

void creat()
{
struct staff one;
if((fp=fopen(filename,"w"))==NULL)
{
printf("\n不能建立！");
}
fprintf(fp,"%-10s%-10s%-10s%-18s%-10s\n%-10s%-10s%-18s%-15s\n","姓名","工号","性别","出生年月","所在部门","职位","工资","电话号码","住址");
printf("\n请输入职工信息（以0结束）\n");
scanf("%s",one.num);
printf("姓名：\n");
scanf("%s",one.name);
while(strcmp(one.name,"0"))
{
printf("工号:\n");
scanf("%s",one.num);
printf("性别:\n");
scanf("%s",one.sex);
printf("出生年月:\n");
scanf("%s",one.bir);
printf("所在部门:\n");
scanf("%s",one.dep);
printf("职位:\n");
scanf("%s",one.pos);
printf("工资:\n");
scanf("%s",one.money);
printf("电话：\n");
scanf("%s",one.tel);
printf("住址：\n");
scanf("%s",one.addr);
fprintf(fp,"%-10s%-10s%-10s%-18s%-10s\n%-10s%-10s%-18s%-15s\n",one.name,one.num,one.sex,one.bir,one.dep,one.pos,one.money,one.tel,one.addr);
printf("姓名:\n");
scanf("%s",one.name);
}
fclose(fp);
}
void browse()
{
struct staff one;
if((fp=fopen(filename,"r"))==NULL)
{
printf("\n不能打开文件！");
}
printf("\n%20s\n","\t\t职工个人信息");
while(!feof(fp))
{
fscanf(fp,"%s%s%s%s%s%s%s%s%s\n",one.name,one.num,one.sex,one.bir,one.dep,one.pos,one.money,one.tel,one.addr);
printf("%-10s%-10s%-10s%-20s%-10s\n%-10s%-10s%-20s%-15s\n",one.name,one.num,one.sex,one.bir,one.dep,one.pos,one.money,one.tel,one.addr);
}
fclose(fp);
}
void append()
{
struct staff one;

if((fp=fopen(filename,"a"))==NULL)
{
printf("\n不能打开该文件！");
}
printf("\n请输入要添加的职工信息,各项之间以回车隔开.\n(姓名 工号 性别 出生年月 所在部门 职位 工资 电话 地址)\n");/*向文件中输入数据*/
scanf("%s%s%s%s%s%s%s%s%s",one.name,one.num,one.sex,one.bir,one.dep,one.pos,one.money,one.tel,one.addr);
fprintf(fp,"%-10s%-10s%-10s%-20s%-10s\n%-10s%-10s%-20s%-15s\n",one.name,one.num,one.sex,one.bir,one.dep,one.pos,one.money,one.tel,one.addr);
fclose(fp);
}
void search1()
{
int k=0;
char namekey[8];
struct staff one;

printf("\n请输入您要查找的职工姓名:");
scanf("%s",namekey);

if((fp=fopen(filename,"rb"))==NULL)
{
printf("\n不能打开文件！");
}
while(!feof(fp))
{
fscanf(fp,"%s%s%s%s%s%s%s%s%s\n",one.name,one.num,one.sex,one.bir,one.dep,one.pos,one.money,one.tel,one.addr);
if(!strcmp(namekey,one.name))
{
printf("\n\n已查到，记录为：");
printf("\n%-10s%-10s%-10s%-20s%-10s\n%-10s%-10s%-20s%-15s\n",one.name,one.num,one.sex,one.bir,one.dep,one.pos,one.money,one.tel,one.addr);
k=1;
}
}
if(!k)
printf("\n\n对不起，查无此人！。");
fclose(fp);
}
void search2()
{
int k=0;
char numkey[8];
struct staff one;

printf("\n请输入您要查找的职工姓工号:");
scanf("%s",numkey);

if((fp=fopen(filename,"rb"))==NULL) /*打开文件*/
{
printf("\n不能打开文件！");
}
while(!feof(fp))
{
fscanf(fp,"%s%s%s%s%s%s%s%s%s\n",one.name,one.num,one.sex,one.bir,one.dep,one.pos,one.money,one.tel,one.addr);
if(!strcmp(numkey,one.num))
{
printf("\n\n已查到，记录为：");
printf("\n%-10s%-10s%-10s%-20s%-10s\n%-10s%-10s%-20s%-15s\n",one.name,one.num,one.sex,one.bir,one.dep,one.pos,one.money,one.tel,one.addr);
k=1;
}
}
if(!k)
printf("\n\n对不起，查无此人！。");
fclose(fp);
}
void modify()
{
int m,k=0;
long offset;
char namekey[8];
struct staff one;

printf("\n请输入您要修改的职工的姓名:");
scanf("%s",namekey);

if((fp=fopen(filename,"r+"))==NULL) /*打开文件*/
{
printf("\n不能打开该文件！");
}
while(!feof(fp))
{
offset=ftell(fp); /*查找信息*/
fscanf(fp,"%s%s%s%s%s%s%s%s%s\n",one.name,one.num,one.sex,one.bir,one.dep,one.pos,one.money,one.tel,one.addr);
if(!strcmp(namekey,one.name))
{
k=1;
break;
}
}
if(k)
{
printf("\n已查到，记录为：");
printf("\n%-10s%-10s%-10s%-20s%-10s\n%-10s%-10s%-20s%-15s\n",one.name,one.num,one.sex,one.bir,one.dep,one.pos,one.money,one.tel,one.addr);
printf("\n请输入信息,各项之间以回车隔开.\n(姓名、工号、性别、出生年月、所在部门、职位、工资、电话、地址)：\n");
scanf("%s%s%s%s%s%s%s%s%s",one.name,one.num,one.sex,one.bir,one.dep,one.pos,one.money,one.tel,one.addr);
fseek(fp,offset,SEEK_SET);
printf("%ld",ftell(fp));
fprintf(fp,"%-10s%-10s%-10s%-20s%-10s\n%-10s%-10s%-20s%-15s\n",one.name,one.num,one.sex,one.bir,one.dep,one.pos,one.money,one.tel,one.addr);
}
else
printf("\n对不起，查无此人,无法进行修改。");
fclose(fp);
}
void del()
{
int m,k=0,flag;
long offset1,offset2;
char namekey[8], valid[4];
struct staff one;

printf("\n请输入您要删除的职工姓名:");
scanf("%s",namekey);
if((fp=fopen(filename,"r+"))==NULL)
{
printf("\n不能打开该文件！");
}
while(!feof(fp))
{
offset1=ftell(fp); /*查询文件中相关的信息*/
fscanf(fp,"%s%s%s%s%s%s%s%s%s\n",one.name,one.num,one.sex,one.bir,one.dep,one.pos,one.money,one.tel,one.addr);
if(!strcmp(namekey,one.name))
{
k=1;
break;
}
}
if(k)
{
printf("\n已查到，记录为");
printf("\n%-10s%-10s%-10s%-20s%-10s\n%-10s%-10s%-20s%-15s\n",one.name,one.num,one.sex,one.bir,one.dep,one.pos,one.money,one.tel,one.addr);
printf("\n确实要删除,按1；不删除，按0：");
scanf("%d",&m);
if(m)
{
fseek(fp,offset1,SEEK_SET);
fprintf(fp,"%-10s%-10s%-10s%-20s%-10s\n%-10s%-10s%-20s%-15s\n","","","","","","","","","");
}
}
else
printf("\n对不起，查无此人。");
fclose(fp);
}