C语言代码错误 不能正常运行 求大神们指正
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
typedef struct student//定义学生
{
char name[10];
int number;
char sex[2];
int math;
int english;
int cyuyan;
int average;}student;
typedef struct unit//定义接点
{
student date;
struct unit *next;
} unit;
unit* build()//建立链表并返回指针
{
unit *p;
if((p=(unit*)malloc(sizeof(unit)))==NULL){
printf("=>初始化失败!");
return 0;
}
else{
p->next=NULL;
p->date.number=0;
printf("初始化成功!\n");
return p;
}
}
void add(unit *head)//增加学生
{
unit *p,*q;
int m,n=0;
q=head->next;
p=(unit*)malloc(sizeof(unit));
printf("=>请输入新生姓名\n");
gets(p->date.name);fflush(stdin);
printf("=>请输入学生学号!\n");
while(n==0){
scanf("%d",&m);fflush(stdin);
if(q==NULL)n=1;
while(q){
if(q->date.number==n){
printf("=>你输入的学号与已有学生的学号相同,请重新输入!\n");
q=head->next;
break;
}
else{
q=q->next;
if(q=NULL)n=1;
}
}
}
p->date.number=m;
printf("=>请输入性别!\n");
gets(p->date.sex);fflush(stdin);
printf("=>请输入数学成绩\n");
scanf("%d,&m");fflush(stdin);
p->date.math=m;
printf("=>请输入英语成绩\n");
scanf("%d,&m");fflush(stdin);
p->date.english=m;
printf("=>请输入c语言成绩\n");
scanf("%d,&m");fflush(stdin);
p->date.cyuyan=m;
p->date.average=(p->date.math+p->date.english+p->date.cyuyan);
q=head->next;
head->next=p;
p->next=q;
head->date.number++;}
void deletion(unit *head)//删除一名学生
{
unit *p=head->next,*q=head;
char N[10];
printf("=>请输入你想要删除的学生姓名!\n");
gets(N);fflush(stdin);
if(p==NULL)
printf("=>系统无学生可删除!\n");
while(p){
if(strcmp(p->date.name,N)==0){
q->next=p->next;
head->date.number--;
printf("=>删除%s成功!\n",p->date.name);
free(p);
break;
}
else{
p=p->next;
q=q->next;
if(p==NULL)
printf("=>你要删除的学生不存在,删除失败!\n");
}
}
}
int display(unit *head)//显示学生信息
{
unit *p=head->next;
int m,n=0;
char N[10];
if(p==NULL){
printf("=>系统无学生!\n");
return 0;
}
while(n==0){
printf("-------------------------\n");
printf("=>请选择你的操作!\n");
printf("=>\t\t\t1.显示所有\t2.0按姓名查找\n\t\t\t3.按学号查找\t4.返回主菜单\n");
scanf("%d",&m);
fflush(stdin);
switch(m)
{
case 1:printf("\n=>该系统拥有%d名学生!\n\n",head->date.number);
p=head->next;
printf("\t姓名\t学号\t性别\t数学\t英语\tc语言\t综合\n\n");
while(p){
printf("\t%s\t%d\t%s\t%d\t%d\t%d\t%d\n",p->date.name,p->date.number,p->date.sex,p->date.math,p->date.english,p->date.cyuyan,p->date.average);
p=p->next;
}
break;
case 2:printf("=>请输入查找姓名!\n");
gets(N);
fflush(stdin);
p=head->next;
while(p){
if(strcmp(p->date.name,N)==0){
printf("\t姓名\t学号\t性别\t数学\t英语\tc语言\t综合\n");
printf("\t%s\t%d\t%s\t%d\t%d\t%d\t%d\n",p->date.name,p->date.number,p->date.sex,p->date.math,p->date.english,
p->date.cyuyan,p->date.average);
break;
}else{
p=p->next;
if(p==NULL)
printf("=>你要查的学生不存在!\n");
}
}break;
case 3:printf("=>请输入查找学号!\n");
scanf("%d",&m);
fflush(stdin);
p=head->next;
while(p){
if(p->date.number==m){
printf("\t姓名\t学号\t性别\t数学\t英语\tc语言\t综合\n");
printf("\t%s\t%d\t%s\t%d\t%d\t%d\t%d\n",p->date.name,p->date.number,p->date.sex,p->date.math,p->date.english,
p->date.cyuyan,p->date.average);
break;
}else{
p=p->next;
if(p==NULL)
printf("=>你要查的学生不存在!\n");
}
}
break;
case 4:n=1;break;
}
}
return 1;
}
int range(unit *head)//排序
{
unit *p=head,*q=head->next;
int n,i,m=head->date.number;
printf("--------------------------\n");
printf("\t\t\t1.按学号\t2.按成绩\n\n");
printf("=>请选择操作!\n");
scanf("%d",&n);
fflush(stdin) ;
if(q==NULL){
printf("=>无学生可排序!\n");
return 0;
}
switch(n){
case 1:for(i=0;i<=m;i++){
p=head;q=head->next;
while(q->next){
if((q->date.number)>(q->next->date.number)){
p->next=q->next;
p=p->next;
q->next=p->next;
p->next=q;
}else{
p=p->next;q=q->next;
}
}
} break;
}
printf("=>排序成功!\n");
return 1;
}
void menu(){
printf("-------------主菜单-------------\n");
printf("\t\t\t1.新建系统\t2.添加学生\n\t\t3.删除学生\t4.查看信息\n\t\t\t5.排列顺序\t6.读取信息\n\t\t\t7.保存信息\t退出系统\n");
printf("=>请输入你的操作!\n");
}
int save(unit *head)//保存
{
FILE *fp;
unit *p;
p=head;
if((fp=fopen("d:\\学生","wb+"))==NULL);
{
printf("=>保存失败!\n");
return 0;
}
while(p){
fwrite(&(p->date),sizeof(student),1,fp);
p=p->next;
}
printf("=>保存成功!\n");
fclose(fp);
return 1;
}
unit* read()//读入系统学生信息
{
int i;
unit *p,*q,*head;
FILE *fp;
if((head=(unit*)malloc(sizeof(unit)))=NULL){
printf("=>开发空间失败!\n");
exit(1);
}
else{
head->next=NULL;
head->date.number=0;//头结点存放学生人数;
}
q=head;
if((fp=fopen("d:\\学生","ra"))==NULL){
printf("=>系统无学生!\n");
return 0;
}
fread(&(q->date),sizeof(student),1,fp);
for(i=0;i<head->date.number;i++){
if((p=(unit*)malloc(sizeof(unit)))==NULL)
{
printf("=>读值失败!\n");
exit(1);
}
fread(&(q->date),sizeof(student),1,fp);
p->next=q->next;
q->next=p;
}
fclose(fp);
return head;
}
int main(){
int m=0,n,i;
unit *head;
printf("--------------------------\n");
printf("\t\t\t* 欢迎使用学生成绩管理系统 *!\n");
printf("\n\t\t\t\t\t\t\t\t\t编译学生:王亚辉\n\n");
printf("正在读取系统信息。。。。。。\n");
if((head=read())==0){
printf("=>是否新建?!\n");
printf("\t\t\t是(1)\t\t否(2)\n");
scanf("%d",&i);
fflush(stdin);
if(i==1)
head=build();
else if(i==2)
exit(1);
}
else
printf("=>信息导入成功!\n");
while(m==0){
menu();
scanf("%d",&n);
fflush(stdin);
switch(n){
case 1:head=build();break;
case 2:add(head);break;
case 3:deletion(head);break;
case 4:display(head);break;
case 5:range(head);break;
case 6:head=read();if(head!=0) printf("=>读取存盘成功!\n");break;
case 7:save(head);break;
case 8:m=1;break;
}
}
}