2. stu_list.c
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include"student.h"
PSTU head1 = NULL ;
int sq_stu ;
#if 1
FILE*fp;
int stu_llopen(char* path)//打开文件
{
fp=fopen(path,"r");
if(fp==NULL){
perror("open fail");
return -1;}
#ifdef _DEBUG_
printf ("open susessn") ;
#endif
PSTU p;
int ret;
while(p)
{
#ifdef _DEBUG_
perror("while -timen");
#endif
p=malloc(sizeof(STU));
if(p==NULL){
printf("申请空间不够");
return -1;}
ret=fscanf(fp,"%d%d%d%d%d%d%s%s",
&p->id,&p->age,&p->math,&p->english,
&p->chinese,&p->class,p->name,p->passwd);
#ifdef _DEBUG_
printf("ret is okn") ;
#endif
if(ret<=0) {
#ifdef _DEBUG_
printf ("list is end n ") ;
#endif
break;
}
if(head1==NULL){
p->next=NULL;
p->pre=NULL;
head1=p;}
else{
p->next=head1;
p->pre=NULL;
head1->pre=p;
head1=p;}
}
return 0;
}
#endif
int stu_llshow()//显示
{
// FILE *fp;
if(head1==NULL)
return -1;
PSTU p=head1;
printf("学号t年龄t数学t英语t语文t班级t姓名n");
while(p)
{
printf("%dt%dt%dt%dt%dt%dt%sn",
p->id,p->age,p->math,p->english,p->chinese,
p->class,p->name);
p=p->next;
}
// fflush(stdout) ;
return 0;
}
int stu_llcheck()//查找
{
printf("n输入查找学号n");
int key;
scanf("%d",&key);
while(getchar()!='n');
PSTU p;
p=head1;
if(head1==NULL)
{
printf ("打开链表失败") ;
return -1;
}
while(p)
{
if(p->id==key) {
#ifdef _DEBUG_
printf ("while p ") ;
#endif
printf("%dt%dt%dt%dt%dt%dt%sn",
p->id,p->age,p->math,p->english,p->chinese,
p->class,p->name);
break ;
}
p=p->next;
}
if (p==NULL) {
printf ("未找到该学生");
printf ("是否继续查找y/n") ;
char ch ;
ch=getchar();
while(getchar()!='n');
if((ch='y')||(ch=='Y'))
stu_llcheck() ;
else exit(1) ;
}
return 0;
}
int __stu_lladd(PSTU p)//被调用添加
{
if(p==NULL) return -1;
if(head1==NULL){
p->next=NULL;
p->pre=NULL;
head1->pre=p;
head1=p;}
else{
p->next=head1;
p->pre=NULL;
head1->pre=p;
head1=p;}
return 0;
}
int stu_lladd()//添加
{
PSTU p;
p=malloc(sizeof(STU));
if(p==NULL) return -1;
printf("n输入添加学生信息nn");
printf("学号t年龄t数学t英语t语文t班级t姓名t密码n");
scanf("%d%d%d%d%d%d%s",
&p->id,&p->age,&p->math,&p->english,
&p->chinese,&p->class,p->name,p->passwd);
__stu_lladd(p);
/* fprintf( fp ,
"%dt%dt%dt%dt%dt%dt%sn",
p->id,p->age,p->math,p->english,p->chinese,p->class,p->name );
fclose (fp) ;
fp = fopen ("student.txt","r" ) ;
*/
return 0;
}
#if 1
int __stu_lldelete(int id)//被调用的删除
{
PSTU p;
PSTU q=NULL;
p=head1;
while(p)
{
if(p->id==id){
if(p==head1){
if(head1->next){
head1=head1->next;
head1->pre=NULL;}
else{
head1=NULL;}
}
else{
if(p->next){
p->pre->next=p->next;
p->next->pre=p->pre;}
else{
p->pre->next=NULL;}
}
break;
}
p=p->next;
}
if (p==NULL) {
printf ("未找到该学生n");
}
free(p);
/* fclose (fp) ;
p=head1 ;
fp = fopen("student.txt","w+");
while(p){
fprintf (fp ,
"%dt%dt%dt%dt%dt%dt%sn",
p->id,p->age,p->math,p->english,p->chinese,p->class, p->name);
p=p->next ;
}
fclose (fp) ;
fp = fopen ("student.txt","r" ) ;
p=head1 ;
stu_llopen("") ;
*/}
int stu_lldelete()//删除
{
int id;
PSTU p;
printf("n输入删除学号n");
scanf("%d",&id);
while(getchar()!='n') ;
return __stu_lldelete(id);
}
#endif
#if 1
int stu_llchange()//修改
{
PSTU p;
printf("n输入修改学号");
int key;
scanf("%d",&key);
while(getchar() != 'n');
p=head1;
while(p)
{
if(p->id==key){
printf("学号t年龄t数学t英语t语文t班级t姓名t密码n");
scanf("%d%d%d%d%d%d%s%s",
&p->id,&p->age,&p->math,&p->english,
&p->chinese,&p->class,p->name,p->passwd);
break ;
}
p=p->next;}
/* fprintf( fp ,
"%dt%dt%dt%dt%dt%st%dn",
p->id,p->age,p->math,p->english,p->chinese,p->name,p->class );
printf("学号t年龄t数学t英语t语文t姓名t班级");
*/ p = head1 ;
printf ("修改之后为n");
printf("学号t年龄t数学t英语t语文t班级t姓名n");
while(p)
{
printf("%dt%dt%dt%dt%dt%dt%sn",
p->id,p->age,p->math,p->english,p->chinese,
p->class,p->name);
p=p->next;
}
return 0;
}
#endif
#if 1 //排序
int stu_sort()
{
PSTU p ;
// p->sum == (p->math + p->english + p->chinese) ;
PSTU new_head1=NULL;
PSTU q=NULL,max=head1,prev;
printf ("按照总成绩排序n");
while(head1)
{
//1,找到最大分数的节点地址
max = head1;
prev=q=NULL;
p=head1;
while(p)
{
if( (p->math+p->english+p->chinese) > (max->math+max->english+max->chinese) )
{
max = p;
prev= q;
}
q = p;
p=p->next;
}
if(prev){
prev->next = max->next;
}else{
head1= head1->next;
}
//3,把该节点头插到新链表头指针
max->next = new_head1;
new_head1 = max;
}
head1 = max;
stu_llshow() ;
return 0 ;
}
#endif
#if 1
PSTU stu_check_id() //校验学生用户名
{
PSTU p;
p = head1;
int id;
char ch;
printf("请输入您的学号:");
scanf("%d",&id);
while(getchar() != 'n');
while(p)
{
if(p->id==id){
return p;
}
p = p->next;
}
printf ("找到该用户n") ;
if(p==NULL){
printf("找不到该用户n");
printf("是否重试?[y/n]n");
ch = getchar () ;
while(getchar()!=' ');
if ((ch=='y')||(ch=='Y'))
stu_check_id();
else
menu();
}
}
#endif
#if 1
PSTU stu_check_passwd() //校验学生密码
{
PSTU p;
p =stu_check_id();
char passwd[20];
char ch;
printf("请输入密码:");
scanf("%s",passwd);
while(getchar()!='n') ;
if(strcmp (p->passwd , passwd)==0)
{
sq_stu = p->id ;
return p;
}else{
printf("密码不正确n");
printf("是否重新输入[y/n]n");
ch = getchar () ;
while(getchar()!='n');
if((ch=='y')||(ch=='Y'))
stu_check_passwd();
else
menu();
}
return NULL;
}
#endif
#if 1
int stu_change_passwd()
{
PSTU p;
p=stu_check_passwd();
// p->passwd=1234;
char new_passwd[20];
char new[20];
char ch;
printf("请输入新密码:");
scanf("%s",new_passwd);
while(getchar() != 'n');
printf("请再次输入新密码:");
scanf("%s",new);
while(getchar()!='n') ;
if(strcmp(new_passwd,new)==0)
{
strcpy(p->passwd,new_passwd) ;
printf("密码修改成功!n");
}
else
{
printf("密码输入错误n");
printf("是否重试[y/n]n");
ch=getchar();
while (getchar()!='n') ;
if((ch=='y')||(ch=='Y'))
stu_change_passwd();
else
student_menu();
}
return 0;
}
#endif
#if 1
int stu_lookme()
{
PSTU p;
p = head1 ;
#ifdef _DEBUG_
printf ("%dn",sq_stu) ;
#endif
while (p) {
if (p->id==sq_stu){
printf("学号t年龄t数学t英语t语文t班级t姓名t密码n");
printf("%dt%dt%dt%dt%dt%dt%st%sn",
p->id,p->age,p->math,p->english,p->chinese, p->class,p->name,p->passwd);
} p = p->next ;
}
return 0 ;
}
#endif
#if 1
int stu_write()
{
PSTU p;
FILE *fp;
// PSTU head1 ;
p=head1;
fp=fopen("student.txt","w");
while(p)
{
fprintf( fp,
"%dt%dt%dt%dt%dt%dt%st%sn",
p->id,p->age,p->math,p->english,p->chinese,p->class,p->name,p->passwd);
p=p->next;
}
return 0;
}
#endif
#if 1
void stu_check_class()
{
int class ;
PSTU p ;
int i=0 ;
p = head1 ;
printf ("请输入您要查找的班级:n");
scanf ("%d",&class);
while(getchar()!='n') ;
while (p){
if (p->class==class ) {
printf("%dt%dt%dt%dt%dt%dt%sn",
p->id,p->age,p->math,p->english,p->chinese,
p->class,p->name);
i++ ; }
p=p->next;
}
if((p==NULL)&&(i==0))
printf("未找到该班级n");
}
#endif
#if 0
int main(int argc,char * argv[])
{
/* if(argc<2){
printf("execult error");
return -1;}
*/ int ret;
PSTU p;
ret=stu_llopen("student.txt");
if(ret<0){
printf("创建失败n");
return -1;}
printf ("debug-000n") ;
// int id;
stu_llshow();
// stu_lldelete();
// stu_llcheck() ;
// stu_llshow();
stu_check_class() ;
// stu_llchange();
// sleep (1) ;
// stu_llshow();
// stu_sort();
// stu_llshow();
return 0;
}
#endif
