#include

#include

#include

#include

#define NUll

#define LEN sizeof(struct student)

struct student

{

int number;

char name[];

float score;

struct student *next;

};

/*函数说明*/

struct student * creat(); /*创建链表*/

void print(struct student *head); /*输出学生信息*/

struct student *add(struct student *head); /*添加学生信息*/

struct student * sort(struct student *head); /*对学生信息进行排序*/

struct student * insert(struct student *head); /*插入学生信息*/

struct student * del_num(struct student *head); /*删除学生信息*/

void search(struct student *head); /*查找学生信息*/

struct student * change(struct student *head); /*修改学生信息*/

int n;

int main()

{

int num,x;

char a[];

struct student *head,*head,*head;

head=NUll;

A

printf(" 学生信息系统 n");

printf(".建立链表n");

printf(".添加学生n");

printf(".插入学生n");

printf(".删除学生n");

printf(".查找学生n");

printf(".修改学生n");

printf(".数据浏览n");

printf(".退出程序n");

printf("请选择操作（输入—）：");

scanf("%d",&num);

switch(num)

{

case 母亲节作文600

head=creat();

break;

case

head=add(head);

head=sort(head);

print(head);

break;

case

head=insert(head);

head=sort(head);

print(head);

break;

case

head=del_num(head);

print(head);

break;

case

search(head);

break;

case

head=change(head);

print(head);

break;

case

print(head);

break;

case

return ;

default

printf("输入错误的数字！！请再输一次！n");

}

goto A;

scanf("%d",&x);

return ;

新年愿望作文}

//创建链表

struct student * creat()

{

struct student *head,*p,*p;

n=;

head=(struct student*)malloc(LEN);

if(head!=NULL)

{

printf("空链表已建立！n");

}

else

{

printf("没有足够的内存空间！n");

}

head>number=;

strcpy(head>name,"");

head>score=;

return head;

}

//输出学生信息

void print(struct student *head)

{

struct student *p;

if(head==NULL)

{

printf("未建立链表！！n");

return;

}

p=head>next;

printf("n所有学生信息的显示为：n");

do

{高中日记

printf("学号：%dt姓名：%st分数：%.fn",p>number,p>name,p>score);

p=p>next;

}while(p!=NUll);

}

//添加学生信息

struct student *add(struct student *head)

{

struct student *p,*p;

if(head==NULL)

{

printf("未建立链表！！n");

return NULL;

}

p=head;

while()

{

p=(struct student *)malloc(LEN);

if(p==NULL)

{

printf("没有足够的空间！n");

return ;

}

print