#include?“stdio.h“
#include?“ctype.h“
#include?“conio.h“
#include?“stdlib.h“
#include?“process.h“
#include?“string.h“
/*Creat?student‘s?information?data?type*/
struct?stuinfo{
????char?num[9];
????int?base;
????int?major;
????int?optional;
????int?humanity;
????int?exp;
};
/*Creat?link?node?data?type?and?creat?head?rear?and?current?pointer*/
struct?linkNode{
????struct?stuinfo?data;
????struct?linkNode?*next;
}*first*end*current;
char?menu_select（void）;/*menu?function*/
void?EnterCredit（void）;/*insert?a?information*/
void?DisplayOne（void）;/*display?a?information*/
void?DisplayAll（void）;/*display?all?the?information*/
void?DisplayClass（void）;/*display?all?the?information?in?the?same?class*/
void?Delete（void）;/*delete?one?information*/
void?Modify（void）;/*modify?one?information*/
void?Sort（）;
void?SortBybase（）;
void?SortByMajor（）;
void?SortByOptional（）;
void?SortByHum（）;
void?SortByExp（）;
void?Statistic（）;
int?SaveData（）;/*save?the?information?to?binary?file?and?txt?file*/
int?LoadData（）;/*load?information*/
int?IsValid（struct?stuinfo）;/*test?the?data?whether?valid?or?not*/
void?Destroylink（void）;/*destroy?the?link?list*/
main（）
{
????char?choice;
????first=end=current=NULL;
????system（“cls“）;/*run?dos?command?to?clean?screen*/
????/*display?the?menu?and?get?choice?then?call?function*/
????for（;;）{
????????choice=menu_select（）;
????????switch（choice）{
????????????case?‘1‘:EnterCredit（）;break;
????????????case?‘2‘:DisplayOne（）;break;
????????????case?‘3‘:DisplayClass（）;break;
????????????case?‘4‘:Delete（）;break;
????????????case?‘5‘:Modify（）;break;
????????????case?‘6‘:Sort（）;break;
????????????case?‘7‘:Statistic（）;break;
????????????case?‘8‘:SaveData（）;break;
????????????case?‘9‘:LoadData（）;break;
????????????case?‘0‘:Destroylink（）;return?1;
????????}
????}
}
char?menu_select（void）
{
????/*Print?the?menu?and?get?the?chioce.*/
????char?temp=‘\0‘ch=‘\0‘;
????system（“cls“）;
????printf（“1.Enter?a?student‘s?credit.\n“）;
????printf（“2.Display?a?student‘s?credit?by?student‘s?number.\n“）;
????printf（“3.Display?all?the?student‘s?credit?in?the?same?class.\n“）;
????printf（“4.Delete?a?student‘s?credit?by?student‘s?number.\n“）;
????printf（“5.Modify?a?student‘s?credit.\n“）;
????printf（“6.Sort?the?information?by?one?credit.\n“）;
????printf（“7.List?some?statistic.\n“）;
????printf（“8.Save?data?to?file.\n“）;
????printf（“9.Load?data?to?file.\n“）;
????printf（“0.Exit?System.\n“）;
????printf（“Enter?your?choice:“）;
????/*using?getch（）?function?get?choice?and?using?enter?key?to?confirm*/
????while（!isdigit（temp）&&temp!=‘\10‘&&temp!=‘\15‘）{
????????temp=getch（）;
????????if（isdigit（ch））{
????????????if（temp==‘\15‘）break;
????????????if（temp==‘\10‘）{
????????????????ch=‘\0‘;
????????????????putchar（temp）;
????????????????putchar（‘?‘）;
????????????????putchar（temp）;
????????????????temp=‘\0‘;
????????	}
????????}
????????else?if（isdigit（temp））{
????????????ch=temp;
????????????putc