自己写的学生成绩管理，但是运行添加成员时会停止，求大神指点错误
小白依旧是小白
，暑假的时候自学c后一点一点编写的，但是选择添加后，输入完全部成绩，按回车就会停止运行，自己检查了好久看不出来，求大神可以指点一下错误在哪里。拜托了！！！！！
程序代码：#include<stdio.h>
#include<string.h>
#include<stdlib.h>
#define N 100
#define LINE -------------------------------------------
#define PUT "|学号|姓名|性别|班级|语文|数学|英语|生物|物理|化学|总分|平均分|\n"
#define PUT1 "|%d |%s |%c |%d|%.1f |%.1f |%.1f |%.1f |%.1f |%.1f |%.1f |%.1f |\n"
#define PUT2 p->grade.num, p->grade.name, p->grade.sex, p->grade.class1, p->grade.ywg, p->grade.sxg, p->grade.yyg, p->grade.swg, p->grade.wlg, p->grade.hxg, p->grade.total, p->grade.ave
FILE *fp;
int i;
int saveflag=0;
struct student
{
int num;
char name[30];
char sex;
int class1;
float ywg;
float sxg;
float yyg;
float swg;
float wlg;
float hxg;
float total;
float ave;
};
typedef struct node
{
struct student grade;
struct node *next;
}LINK;
LINK *exam;
void Save(LINK *L)
{
LINK *p;
p=L->next;
fp=fopen("grades.txt","w+");
if(fp==NULL)
{
printf("打开失败！\n");
return;
}
while(p!=NULL)
{
fwrite(p,sizeof(LINK),1,fp);
p=p->next;
}
fclose(fp);
}
void menu()
{
printf("---------------学生成绩管理系统---------------\n");
printf("\t0.退出 1.显示记录\n\t2.添加记录 3.删除记录\n\t4.查询记录 5.修改记录\n\t6.统计成绩 7.插入记录\n\t8.排序并输出 9.保存\n");
printf("----------------------------------------------\n");
}
void Read(LINK *L)
{
LINK *p;
p=L->next;
if(p=NULL)
{
printf("不存在！");
return;
}
printf(PUT);
while(p!=NULL)
{
printf(PUT1,PUT2);
}
}
void Add(LINK *L)
{
LINK *r,*p,*q;
char ch;
r=(LINK*)malloc(sizeof(LINK));
if(r==NULL)
{
printf("分配失败！\n");
exit(1);
}
printf("是否添加记录（y/s）？\n");
scanf("%s",&ch);
if(ch=='y')
{
printf("请输入数据：\n");
printf("学号：");scanf("%d",&r->grade.num);
for(p=L->next;p!=NULL;p=p->next)
if(p->grade.num==r->grade.num)
{printf("此学生已经存在！");return;}
printf("姓名：");scanf("%s",&r->grade.name);
printf("性别：");scanf("%s",&r->grade.sex);
printf("班级：");scanf("%d",&r->grade.class1);
printf("语文成绩：");
scanf("%f",&r->grade.ywg);
printf("数学成绩：");
scanf("%f",&r->grade.sxg);
printf("英语成绩：");
scanf("%f",&r->grade.yyg);
printf("生物成绩：");
scanf("%f",&r->grade.swg);
printf("物理成绩：");
scanf("%f",&r->grade.wlg);
printf("化学成绩：");
scanf("%f",&r->grade.hxg);
r->grade.total=r->grade.ywg+r->grade.sxg+r->grade.yyg+r->grade.swg+r->grade.wlg+r->grade.hxg+r->grade.swg;
r->grade.ave=r->grade.total/6;
if(L->next==NULL)
{
L->next=r;
q=r;
q->next=NULL;
}
else
{
q=L->next;
while(q->next!=NULL)
{
q=q->next;
}
q->next=r;
q=r;
q->next=NULL;
}
}
Save(L);
}
void Del(LINK *L)
{
int ch;
LINK *p,*q,*r;
printf("请输入删除的学号：\n");
scanf("%d",&ch);
for(p=L;p!=NULL;p=p->next)
{
q=p;
p=p->next;
r=p->next;
if(p->grade.num==ch)
{
q->next=r;
free(p);
break;
}
else
p=q;
}
if(p==NULL)
printf("此记录不存在！\n");
Save(L);
}
void Query(LINK *L)
{
LINK *p;
int ch;
printf("请问是按学号（按1）还是姓名（按2）查询？\n");
scanf("%d",&ch);
if(ch==1)
{
printf("请输入学号：\n");
scanf("%d",&exam->grade.num);
for(p=L->next;p!=NULL;p=p->next)
if(p->grade.num==exam->grade.num)
{
printf(PUT);
printf(PUT1,PUT2);
break;
}
if(p==NULL)
printf("此学号不存在！\n");
}
if(ch==2)
{
printf("请输入姓名：");
scanf("%s",&exam->grade.name);
for(p=L->next;p!=NULL;p=p->next)
if(!strcmp(p->grade.name,exam->grade.name))
{
printf(PUT);
printf(PUT1,PUT2);
break;
}
if(p==NULL)
printf("此姓名不存在！\n");
}
}
void Modify(LINK *L)
{
LINK *p;
printf("请输入要修改的学号：");
scanf("%d",&exam->grade.num);
for(p=L->next;p!=NULL;p=p->next)
{
if(p->grade.num==exam->grade.num)
{
printf("请输入修改后的成绩：\n");
printf("语文成绩：");scanf("%f",&p->grade.ywg);
printf("班级：");scanf("%d",&p->grade.class1);
printf("语文成绩：");scanf("%f",&p->grade.ywg);
printf("数学成绩：");scanf("%f",&p->grade.sxg);
printf("英语成绩：");scanf("%f",&p->grade.yyg);
printf("生物成绩：");scanf("%f",&p->grade.swg);
printf("物理成绩：");scanf("%f",&p->grade.wlg);
printf("化学成绩：");scanf("%f",&p->grade.hxg);
p->grade.total=p->grade.ywg+p->grade.sxg+p->grade.yyg+p->grade.swg+p->grade.wlg+p->grade.hxg+p->grade.swg;
p->grade.ave=p->grade.total/6;
break;
}
}
Save(L);
}
void Tongji(LINK *L)
{
LINK *p,*r;
r=L->next;
while(r!=NULL)
{
if(r->grade.total > r->next->grade.total)
{
p=r;
}
else
{
p=r->next;
}
r=r->next;
}
printf("总分最高是：\n");
printf(PUT);
printf(PUT1,PUT2);
}
void Insert(LINK *L)
{
LINK *p,*r;
p=(LINK*)malloc(sizeof(LINK));
printf("请输入插入的学号：");
scanf("%d",&p->grade.num);
r=L->next;
if(r==NULL)
{
r=p;
p->next=NULL;
}
else
{
if(p->grade.num < r->grade.num)
{
p->next=r;
L->next=p;
}
else
{
for(;r->next!=NULL;r=r->next)
{
if(r->grade.num==p->grade.num)
{
printf("这个学号已经存在！\n");
return;
}
else if((r->grade.num < p->grade.num)&&(p->grade.num < r->next->grade.num))
{
p->next=r->next;
r->next=p;
}
}
if(r->next==NULL)
{
r->next=p;p->next=NULL;
}
}
}
printf("姓名：");
scanf("%s",p->grade.name);
printf("性别：");
scanf("%s",&p->grade.sex);
printf("班级：");
scanf("%d",&p->grade.class1);
printf("语文成绩：");
scanf("%f",&p->grade.ywg);
printf("数学成绩：");
scanf("%f",&p->grade.sxg);
printf("英语成绩：");
scanf("%f",&p->grade.yyg);
printf("生物成绩：");
scanf("%f",&p->grade.swg);
printf("物理成绩：");
scanf("%f",&p->grade.wlg);
printf("化学成绩：");
scanf("%f",&p->grade.hxg);
p->grade.total=p->grade.ywg+p->grade.sxg+p->grade.yyg+p->grade.swg+p->grade.wlg+p->grade.hxg+p->grade.swg;
p->grade.ave=p->grade.total/6;
Save(L);
}
void Sort(LINK *L)
{
LINK *p,*q,*r;
if(L->next==NULL)
printf("无记录！\n");
else
{
p=L->next;
r=p;
q->next=r;
r->next=NULL;
for(p=p->next;p!=NULL;p=p->next)
{
if(p->grade.num < q->next->grade.num)
{
p->next=q->next;
q->next=p;
}
r=q->next;
while((p->grade.num > q->next->grade.num)&&(r->next!=NULL))
{
if(p->grade.num < r->next->grade.num)
{
p->next=r->next;
r->next=p;
break;
}
r=r->next;
}
if(r->next==NULL)
{
r->next=p;
p->next=NULL;
r=p;
}
}
}
Save(L);
}
int main()
{
LINK *L;
LINK *p,*q;
int select,m=1;
L=(LINK*)malloc(sizeof(LINK));
if(L==NULL)
{
printf("分配失败！\n");
return 0;
}
L->next=NULL;
q=L;
fp=fopen("grades.txt","r");
if(fp==NULL)
{
fp=fopen("grades.txt","w+");
i=0;
}
else
{
while(!feof(fp))
{
p=(LINK*)malloc(sizeof(LINK));
if(p==NULL)
{
printf("分配失败！\n");
return 0;
}
if(fread(p,sizeof(LINK),1,fp)==1)
{
p->next=NULL;
q->next=p;
q=p;
i++;
}
}
}
fclose(fp);
printf("\n打开成功，一共有%d条记录。\n",i);
while(m)
{
menu();
printf("请选择选项：（0~9）：\n");
scanf("%d",&select);
switch(select)
{
case 0:if(saveflag==0)
m=0;
else if(saveflag==1)
Save(L);
m=0;break;
case 1:Read(L);break;
case 2:Add(L);break;
case 3:Del(L);break;
case 4:Query(L);break;
case 5:Modify(L);break;
case 6:Tongji(L);break;
case 7:Insert(L);break;
case 8:Sort(L);break;
case 9:Save(L);saveflag=0;break;
default:printf("请输入0~9的选项：\n");break;
}
}
system("pause");
return 0;
}
