c语言程序设计题，高人来指点一下

你好

网上找的，希望你能用

#include "stdio.h"
#include "stdlib.h"
#include "string.h"
typedef struct subjects
{
int num;
char name[20];
char kind[10];
int stime;
int ttime;
int etime;
int score;
int term;
struct subjects *next;
}SUB;

SUB *create_form()
{
SUB *head,*tail,*p;
int num,stime,ttime;
int etime,score,term;
char name[20],kind[10];
int size=sizeof(SUB);
head=tail=NULL;
printf("输入选修课程信息:\n");
scanf("%d%s%s%d%d%d%d%d",&num,name,kind,&stime,&ttime,&etime,&score,&term);
while(num!=0){
p=(SUB *)malloc(size);
p->num=num;
strcpy(p->name,name);
strcpy(p->kind,kind);
p->stime=stime;
p->ttime=ttime;
p->etime=etime;
p->score=score;
p->term=term;
if(head==NULL)
head=p;
else
tail->next=p;
tail=p;
scanf("%d%s%s%d%d%d%d%d",&num,name,kind,&stime,&ttime,&etime,&score,&term);
}
tail->next=NULL;
return head;
}

void savefile(SUB *head)
{
SUB *p;
FILE *fp;
fp=fopen("subjects.txt","w");
fprintf(fp,"课程编号 课程名称 课程性质 总学时 授课学时 实验或上机学时 学分 开课学期\n");
for(p=head;p;p=p->next)
fprintf(fp,"%5d%12s%9s%9d%9d%11d%11d%7d\n",p->num,p->name,p->kind,p->stime,p->ttime,p->etime,p->score,p->term);
fclose(fp);
}

void savefileadd(SUB *head)
{
SUB *p;
FILE *fp;
fp=fopen("subjectsadd.txt","w");
fprintf(fp,"课程编号 课程名称 课程性质 总学时 授课学时 实验或上机学时 学分 开课学期\n");
for(p=head;p;p=p->next)
fprintf(fp,"%5d%12s%9s%9d%9d%11d%11d%7d\n",p->num,p->name,p->kind,p->stime,p->ttime,p->etime,p->score,p->term);
fclose(fp);
}

void savefiledel(SUB *head)
{
SUB *p;
FILE *fp;
fp=fopen("subjectsdel.txt","w");
fprintf(fp,"课程编号 课程名称 课程性质 总学时 授课学时 实验或上机学时 学分 开课学期\n");
for(p=head;p;p=p->next)
fprintf(fp,"%5d%12s%9s%9d%9d%11d%11d%7d\n",p->num,p->name,p->kind,p->stime,p->ttime,p->etime,p->score,p->term);
fclose(fp);
}

void prin(SUB *head)
{
SUB *ptr;
if(head==NULL){
printf("NO RECORDS!\n");
return;
}
printf("课程编号 课程名称 课程性质 总学时 授课学时 实践或上机学时 学分 开课学期\n");
for(ptr=head;ptr;ptr=ptr->next)
printf("%5d%12s%9s%9d%9d%11d%11d%7d\n",ptr->num,ptr->name,ptr->kind,ptr->stime,ptr->ttime,ptr->etime,ptr->score,ptr->term);
}

void search(SUB *head)
{
int a,num;
int t=1;
char type[10];
char ch='a',ch1;
SUB *ptr;

while(ch!=' '){
printf("若要按课程性质查找请输入1，若要按学分查找请输入2:\n");
scanf("%d",&a);
switch(a){
case 1:printf("请输入要查找的课程的性质:\n");
scanf("%s",type);
printf("课程编号 课程名称 课程性质 总学时 授课学时 实践或上机学时 学分 开课学期\n");
for(ptr=head;ptr;ptr=ptr->next)
if(strcmp(type,ptr->kind)==0){
printf("%5d%12s%9s%9d%9d%11d%11d%7d\n",ptr->num,ptr->name,ptr->kind,ptr->stime,ptr->ttime,ptr->etime,ptr->score,ptr->term);
t=0;
}
if(t) printf("未找到!\n");
t=1;
break;
case 2:printf("输入要查找的课程的学分\n");
scanf("%d",&num);
printf("课程编号 课程名称 课程性质 总学时 授课学时 实践或上机学时 学分 开课学期\n");
for(ptr=head;ptr;ptr=ptr->next)
if(ptr->score==num){
printf("%5d%12s%9s%9d%9d%11d%11d%7d\n",ptr->num,ptr->name,ptr->kind,ptr->stime,ptr->ttime,ptr->etime,ptr->score,ptr->term);
t=0;
}
if(t) printf("未找到!\n");
t=1;

}
printf("继续查找请按回车键，结束请按空格键:\n");
ch1=getchar();
ch=getchar();
}
}

SUB *insert(SUB *head)
{
SUB *ptr,*ptr2,*subj;
int size=sizeof(SUB);
char ch='a',ch1;
while(ch!=' '){
subj=(SUB *)malloc(size);
ptr=subj;
printf("输入要插入的课程信息:\n");
scanf("%d%s%s%d%d%d%d%d",&subj->num,subj->name,subj->kind,&subj->stime,&subj->ttime,&subj->etime,&subj->score,&subj->term);
if(head==NULL){
head=ptr;
head->next=NULL;
}
else{
for(ptr2=head;ptr2;ptr2=ptr2->next)
if(ptr2->next==NULL){
ptr2->next=subj;
subj->next=NULL;
break;
}
}
printf("继续插入请按回车，结束请按空格:\n");
ch1=getchar();
ch=getchar();
}
return head;
}

SUB *del(SUB *head)
{
SUB *p1,*p2;
char ch='a',ch1;
int num;
while(ch!=' '){
printf("输入想要删除的课程编号:\n");
scanf("%d",&num);
if(head->num==num){
p2=head;
head=head->next;
free(p2);
}
if(head==NULL)
return NULL;
p1=head;
p2=head->next;
while(p2){
if(p2->num==num){
p1->next=p2->next;
free(p2);
}
else p1=p2;
p2=p1->next;
}
printf("继续删除请按回车，结束请按空格:\n");
ch1=getchar();
ch=getchar();
}
return head;
}

void choose(SUB *head)
{
SUB *p,*q;
int a[5];
int num,total=0,i=0,j;
printf("输入要选修的课程的编号，编号之间以空格分开，输完后以0结束\n");
scanf("%d",&num);
while(num!=0){
for(p=head;p;p=p->next)
if(p->num==num){
total=total+p->score;
a[i]=num;
i++;
}
scanf("%d",&num);
}
if(total<60) printf("选修总学分未达到60,选修失败!\n");
else {
printf("选修成功!\n");
printf("您选修的课程为:\n");
for(j=0;j for(q=head;q;q=q->next)
if(q->num==a[j])
printf("%s ",q->name);
printf("\n");
}
}

void main()
{
SUB *head=create_form();
savefile(head);
prin(head);
search(head);
head=insert(head);
savefileadd(head);
printf("修改后的信息为:\n");
prin(head);
head=del(head);
savefiledel(head);
printf("修改后的课程信息为:\n");
prin(head);
choose(head);
}

typedef struct class{
int class_num;课程编号
char class_name[30];课程名称
char class_attri[10];课程性质
int class_time;总学时
int study_time;授课学时
int on_time;上机学时
int class_score;学分
int start_class;开课学期
}
typedef struct sle_class{
int sle_num;
int class_num;
}

程序代码，我可以很容易的帮你写出来
但是我觉得那对你一点用处都没有
我建议你还是去多看几下，结构体那章
学C最重要的是写代码，跳过了这环，叫别人代替，最后吃亏的是你自己