STU *display_student(STU *stu_head);

STU *search_by_name(STU *stu_head, char name[]);

STU *search_by_nb(STU *stu_head, unsigned long nb);

#endif

3.store.h

#ifndef _STORE_H_

#define _STORE_H_

void save_student(STU *stu_head);

STU *init_student(STU *stu_head);

#endif

4.students.c

这个文件是本设计的核心部分，包括各个模块的实现函数，包括添加，删除，修改，查找，显示学生信息这几个模块的实现。

#include

#include "students.h"

STU *select_sort(STU *g, char flag)

{

STU *p,*q,*t,*s,*h;

h=(STU *)malloc(sizeof(STU));

h->next=g;

p=h;

while(p->next->next!=NULL)

{

for(s=p,q=p->next;q->next!=NULL;q=q->next)

{

if(flag == '1')

if(q->next->IDnext->ID)

s=q;

if(flag == '2')

if(q->next->chinesenext->chinese)

s=q;

if(flag == '3')

if(q->next->mathnext->math)

s=q;

if(flag == '4')

if(q->next->englishnext->english)

s=q;

if(flag == '5')

if(q->next->averagenext->average)

s=q;

}

if(s!=q)

{

t=s->next;

s->next=t->next;

t->next=p->next;

p->next=t;

}

p=p->next;

}

g=h->next;

free(h);

return g;

}

STU *add_student(STU *stu_head)

{

STU *stu;

STU *head = stu_head;

STU *node = stu_head;

STU *node_fd;

int sel;

ASK_STU(stu);

stu->next = NULL;

printf("请输入学生学号:");

scanf("%d", &stu->ID);

while(search_by_nb(node, stu->ID)){

printf("已经存在该学号！请重新输入一个学号:");

scanf("%d", &stu->ID);

}

printf("请输入学生名字:");

scanf("%s", stu->name);

printf("请输入该学生英语成绩:");

scanf("%f", &stu->english);

while(stu->english < 0.0 || stu->english > 100.0){

printf("输入错误，请重新输入英语成绩:");

scanf("%f", &stu->english);

}

printf("请输入该学生数学成绩:");

scanf("%f", &stu->math);

while(stu->math < 0.0 || stu->math > 100.0){

printf("输入错误，请重新输入数学成绩:");

scanf("%f", &stu->math);

}

printf("请输入该学生语文成绩:");

scanf("%f", &stu->chinese);

while(stu->chinese < 0.0 || stu->chinese > 100.0){

printf("输入错误，请重新输入数学成绩:");

scanf("%f", &stu->chinese);

}

stu->all_sub = stu->chinese+stu->math+stu->english;

stu->average = stu->all_sub/3;

if(!head){

head = stu;

return head;

}

while(node->next)

node = node->next;

node->next = stu;

head = select_sort(head, '1');

return head;

}

STU *del_all(STU *stu_head)

{

if(!stu_head)

return NULL;

del_all(stu_head->next);

free(stu_head);

stu_head = NULL;

return NULL;

}

STU *del_one(STU *stu_head, int flag)

{

STU *node = stu_head;

STU *head = stu_head;

STU *pre;

char name[10];

unsigned long ID;

if(head = NULL){

printf("没有任何学生信息！\n");

return head;

}

if(flag == '2'){