#include<malloc.h>
#include<stdio.h>
#define LEN sizeof(struct student)
struct student
{
long num;
float English;
float math;
float chinese;
struct student *next;
};
int n;
struct student *creat(void )
{
struct student *head;
struct student *p1,*p2;
n=0;
p1=p2=(struct student *)malloc(LEN);
scanf("%1d,%f,%f,%f,%f",&p1->num,&p1->English,&p1->math,&p1->chinese);
head=NULL;
while(p1->num!=0)
{
n=n+1;
if(n==1)head=p1;
else p2->next=p1;
p2=p1;
p1=(struct student *)malloc(LEN);
scanf("%1d,%f,%f,%f,%f",&p1->num,&p1->English,&p1->math,&p1->chinese);
}
p2->next=NULL;
return head;
}
struct student *del(struct student *head,long num)
{
struct student *p1,*p2;
if(head==NULL){printf("\n没有数据!\n");goto end;}
p1=head;
while(num!=p1->num&&p1->next!=NULL)
{
p2=p1;p1=p1->next;
}
if(num==p1->num)
{if(p1==head)head=p1->next;
else p2->next=p1->next;
printf("删除:%d\n",num);
n=n-1;
}
else printf("%1d 没有被找到!\n",num);
end: return head;
}
struct student *insert(struct student *head,struct student *stud)
{
struct student *p0,*p1,*p2;
p1=head;
p0=stud;
if(head==NULL)
{
head=p0;p0->next=NULL;}
else
{while((p0->num>p1->num)&&(p1->next!=NULL))
{p2=p1;
p1=p1->next;
}
if(p0->num<=p1->num)
{
if(head==p1)head=p0;
else p2->next=p0;
p0->next=p1;}
else
{
p1->next=p0;p0->next=NULL;
}}
n=n+1;
return(head);
}
void print(struct student *head)
{
struct student *p;
printf("\n现在 ,这些%d记录是:\n",n);
p=head;
if(head!=NULL)
do
{printf("%1d,%.1f,%.1f,%.1f\n",p->num,p->English,p->math,p->chinese);
p=p->next;
}while(p!=NULL);
}
main()
{
struct student *head,*stu;
long del_num;
int x;
printf("选择1 请输入数据,选择2删除数据\n");
printf("选择3 插入数据 ,选择4退出\n");
scanf("%d",&x);
do
{
switch(x)
{
case 1:
printf("输入数据:--输入0,0,0,0表示终止.\n");
head=creat();break;
case 2:
printf("\n输入删除数据的学号:--输入0表示终止\n");
scanf("%1d",&del_num);
while(del_num!=0)
{
head=del(head,del_num);
print(head);
printf("\n输入删除数据的学号:--输入0表示终止\n");
scanf("%1d",&del_num);
}break;
case 3:
printf("\n插入数据:--输入0,0,0,0表示终止.\n");
stu=(struct student *)malloc(LEN);
scanf("%1d,%f,%f,%f,%f",&stu->num,&stu->English,&stu->math,&stu->chinese);
while(stu->num!=0)
{
head=insert(head,stu);
print(head);
printf("\n插入数据:--输入0,0,0,0表示终止.\n");
stu=(struct student *)malloc(LEN);
scanf("%1d,%f,%f,%f,%f",&stu->num,&stu->English,&stu->math,&stu->chinese);
}break;
default:printf("ERROR!\n");
}
printf("请选择功能:--2(删除)--3(插入)--4(退出)\n");
scanf("%d",&x);
}while(x!=4);
}
