//头文件
#include <string.h>
#include <stdio.h>
#include <iostream.h>
#include <stdlib.h>
#include <iomanip.h>
#include <fstream.h>
#include <conio.h>

///////////////////////////////////////////////////////////////////////////
//定义课程
struct course        //某个学生所学的课程中的某一个
{
char cname[20]; //课程名称
float grade;    //课程成绩
course *Next;   //指向下一个课程的指针
};
///////////////////////////////////////////////////////////////////////////
//学生类
class student
{
public:
student()
{
root = NULL;
const maxcourse = 5;
factcourse = 0;
}
void readname(char N[] );    //读入学生的姓名
void getname(char N[]);     //得到学生的姓名
void wrecourse(char N[],float score); //要据课程名写入学生课程的成绩
float average();       //学生课程的平均成绩
void addcourse(char N[],float g); //给学生增加一门课
int findcourse(char N[]);    //查找是否已有此课程,如果有返回1,如果没有返回0
int retfactcourse()
{
return factcourse;
}         //得到所学的课程数目
course *retroot()
{
return root;      //利用键表将所有的课程保存起来
}
int retmaxcourse()
{
return 5;      //得到最多可学的课程数目
}
void clrroot()      //清零
{
root = NULL;
factcourse = 0;
}
//student()
//{

//}

private:
char sname[20];        //学生的姓名
int maxcourse;      //学生最多可以学五门课程
int factcourse;      //学生实际所学的课程数目
course *root;      //课程的根结点指针
};

void student::readname (char N[])
{
strcpy(sname,N);
}

void student::getname(char N[])
{
strcpy(N,sname);
}

void student::wrecourse(char N[],float score)
{
course *p = root;
if(p==NULL)
return;
if(p!=NULL)
p = p->Next;
while(p)
{
if(strcmp(p->cname,N)==0)
p->grade = score;

p = p->Next;
}
}

float student::average()
{
float aver=0.0;
course *p = root;

while (p)
{
aver = aver+p->grade;
}

aver = aver/factcourse;
return aver;
}

void student::addcourse (char N[],float g)
{
course *s = new course;
s->Next=NULL;
if(root == NULL)
root = s;
course *p = root;
course *newcourse = new course;
newcourse->Next = p->Next;
p->Next=newcourse;
strcpy(newcourse->cname,N);
newcourse->grade = g;
factcourse++;

}

int student::findcourse (char N[])
{
course *p = root;
if(root==NULL)
return 0;
p = p->Next;
while(p)
{
if(strcmp(p->cname,N)==0)
return 1;
p = p->Next;
}
return 0;
}
/////////////////////////////////////////////////////////////////////////////////////////////
struct studentdb
{
student stu;
studentdb *Next;
};
struct studentname
{
char tname[20];       //学生的名字
float result;     //学生所得的该课程分数
studentname *Next;
};
/////////////////////////////////////////////////////////////////////////////////////////////
//课程类
class subject
{
public:
subject()
{
first = NULL;
maxstudent=30;
activestudnet=0;
}
float readcredit();    //得到课程的学分
void getcredit(float a); //设置学分
float getaverage();    //得到学生的平均成绩
float getresult(char N[]); //查找某个学生的成绩
void getkname(char N[]); //读出课程的名称
void setkname(char N[]); //读入课程的名称
studentname *retfirst()
{
return first;    //返回根结点
}
void findstudent(studentdb *P); //根据该课程的名称,寻找选这课程的学生
int retactivestudent()
{
return activestudnet; //返回实际学生数
}
int retmaxstudent()
{
return 30;     //返回最多学生数30
}
void clractivestudnet()
{
activestudnet = 0;   //从文件中读出来后将实际学生数清零
}

private:
int maxstudent;    //最多学生数
int activestudnet;   //实际学生数
studentname *first;   //学生名单
float credit;    //该课程的学分
float averagerusult; //该课程的平均成绩
char kname[20];    //该课程的名称
};

float subject::readcredit ()
{
return credit;
}

void subject::getcredit (float a)
{
credit=a;
}

float subject::getaverage()
{
float k = 0.0;
studentname *p;
p=first->Next;
if(p==NULL)
return 0;
while(p)
{
k = k + p->result;
p = p->Next ;
}

return k/activestudnet;
}

float subject::getresult (char N[])
{
studentname *p;
p = first;
while(p)
{
if(strcpy(p->tname ,N)==0)
return p->result;
p = p->Next ;
}
return -1;
}

void subject::getkname (char N[])
{
strcpy(N,kname);
}

void subject::setkname (char N[])
{
strcpy(kname,N);
}

void subject::findstudent(studentdb *P)
{
studentname *newcode = new studentname;
newcode->Next=NULL;
first = newcode;
studentname *T = first;

studentdb *K = P->Next;
while(K)
{
course *Y = K->stu.retroot();
if(Y ==NULL)
{
K = K->Next;
continue;
}
if(Y!=NULL)
Y = Y->Next;
while(Y)
{
if(strcmp(Y->cname,kname)==0)
{
studentname *Acode = new studentname;
char Name[20];
K->stu.getname(Name);
strcpy(Acode->tname,Name);
Acode->result = Y->grade;
Acode->Next = T->Next;
T->Next = Acode;
activestudnet = activestudnet + 1;
break;
}

Y = Y->Next;
}
K = K->Next;
}
return ;
}
///////////////////////////////////////////////////////////////////////////////////
void tuichu()
{
system("cls");
cout<<"\n\n\t\t\t谢谢你使用选修课小系统\t再见\n\n"<<endl;
cout<<"\n\t   如果你觉得此软件有修改及补充之处，请按以下方式联系我们,"
<<"\n\t提出你的宝贵意见.我们将不断地改进并及时的公布新版本。谢谢!!\n\n"<<endl;
cout<<"\t\t联系方式：\n"
<<"\t\t        姓名:郑德锋\n\n"
<<"\t\t        电话:0594-2657094\n\n"
<<"\t\t       Email:cyan_studio@163.com\n\n"
<<"\t\t    学校地址:莆田学院36号0443信箱\t邮政编码:351100\n\n\n"<<endl;
getch();
exit(-1);
}
//////////////////////////////////////////////////////////////////////////////////
//总菜单
char menu()
{
int k=0;
char a[3],c,i;
system("cls");
cout<<endl<<endl;
cout<<"\t\t\t\tC++课程设计课题\n\n"<<endl;
cout<<"\t\t********************************************\n"
<<"\t\t*                                          *\n"
<<"\t\t*                选修课小系统              *\n"
<<"\t\t*                                          *\n"
<<"\t\t*                                          *\n"
<<"\t\t*     操作方式:                            *\n"
<<"\t\t*               1.选修课系统学生端         *\n"
<<"\t\t*                                          *\n"
<<"\t\t*               2.选修课系统管理端         *\n"
<<"\t\t*                                          *\n"
<<"\t\t********************************************\n"<<endl;

while(1)
{
cout<<"\n\t\t请选择登入方式: ";
cin>>a;
if(strlen(a)==1)
{
for(i='1';i<='2';i++)
{
c=i;
if(c==a[0])
return c;
}
}
cerr<<"\n\n\t\t\t\t输入有误!\n"<<endl;
k++;
if(k>2)
{
system("cls");
cerr<<"\n\n\n\t\t~~提示~~:错误输入次数超过三次，你将被强制退出!!\n\n"<<endl;
cout<<"\t\t按任意键继续"<<endl;
getch();
tuichu();
}
}
}
///////////////////////////////////////////////////////////////////////////////////
//选修课系统端操作
char custom()
{
char A[10];
char b;
char i;
int k = 0;
system("cls");;
cout<<"\n\n\n"
<<"\t\t※※※※※※※※※※※※※※※※※※※※※※※※※※※\n"
<<"\t\t※选修课系统学生端※\n"
<<"\t\t※               ※\n"
<<"\t\t※ 操作方式: ※\n"
<<"\t\t※1.学生选课 ※\n"
<<"\t\t※2.学生情况※\n"
<<"\t\t※3.选课情况※\n"
<<"\t\t※4.退出系统※\n"
<<"\t\t※              ※\n"
<<"\t\t※※※※※※※※※※※※※※※※※※※※※※※※※※※\n"<<endl;

while(1)
{
cout<<"\t\t\t请选择操作方式: ";
cin>>A;
if(strlen(A)==1)
{
for(i='1';i<='4';i++)
{
b=i;

if(b==A[0]) return b;
}
}
cerr<<"\n\t\t\t\t输入有误!\n"<<endl;
k++;
if(k>2)
{
system("cls");
cerr<<"\n\n\t\t\t~~提示~~：错误输入超过三次!你将被强制退出!!\n"<<endl;
cout<<"\t\t按任意键继续"<<endl;
getch();
tuichu();
}
}
}
char server()
{
char A[10];
char b;
char i;
int k = 0;
system("cls");;
cout<<"\n\n\n"
<<"\t\t※※※※※※※※※※※※※※※※※※※※※※※※※※※\n"
<<"\t\t※                                                  ※\n"
<<"\t\t※                  选修课系统管理端                ※\n"
<<"\t\t※                                                  ※\n"
<<"\t\t※      操作方式:                                   ※\n"
<<"\t\t※               1.增加学生      2.增加课程         ※\n"
<<"\t\t※               3.删除学生      4.删除课程         ※\n"
<<"\t\t※               5.填写成绩      6.更改学分         ※\n"
<<"\t\t※               7.学生情况      8.选课情况         ※\n"
<<"\t\t※               9.保存数据      0.退出系统         ※\n"
<<"\t\t※                                                  ※\n"
<<"\t\t※※※※※※※※※※※※※※※※※※※※※※※※※※※\n"<<endl;
while(1)
{
cout<<"\t\t 请选择操作方式: ";
cin>>A;
if(strlen(A)==1)
{
for(i='0';i<='9';i++)
{
b=i;
if(b==A[0])
return b;
}
}
cerr<<"\n\t\t\t\t输入有误!\n"<<endl;;
k++;
if(k>2)
{
cerr<<"错误输入超过三次!\n";
exit(-1);
}
}
}
//////////////////////////////////////////////////////////////////////////////////
//密码检查
void password()
{
int k=0,i;
char A[]="0411200";
char B[10];
char a;
system("cls");
for(i=0;i<8;i++)
cout<<endl;

while(k<=2)
{

printf("\t\t\t请输入管理员密码:");
i=0;
while(1)
{
a=getch();
if(a==13)
break;
B[i]=a;
i++;
printf("*");
}
B[i]='\0';
if(strcmp(A,B)==0)
return;
else
{
k++;
cerr<<"\n\n\t\t\t密码输入错误!请重新输入!\n"<<endl;
}
if(k>=3)
{
system("cls");
cerr<<"\n\n\t\t\t输入错误密码超过三次!请按任意键退出.."<<endl;
getch();
tuichu();
}
}
}

///////////////////////////////////////////////////////////////////////
struct subjectdb
{
subject sub;
subjectdb *Next;
};

int menu_2_7(studentdb *P);
int menu_2_9(studentdb *Y,subjectdb *P);
int menu_2_8(subjectdb *P);
////////////////////////////////////////////////////////////////////////
//学生端功能函数
int menu_1_1(studentdb *P,subjectdb *X)    //学生选课
{
system("cls");
cout<<"\n\n\t\t\t\t学生选课操作"<<endl;
//
studentdb *q=P->Next;
int i;
char N[20],M[20];
if(q!=NULL)
cout<<"\n\n\n\t\t所有学生名单如下:\n"<<endl;
else
{
cerr<<"\n\n\n\t\t对不起,暂时没有学生名单!请按任意键继续.."<<endl;
return 1;
}
while(q)
{
q->stu.getname(N);
cout<<"\t\t\t\t"<<N;
cout<<endl;
q = q->Next ;
}

q = P->Next;
if(q==NULL)
return 1;

cout<<"\n\n\t\t 请输入学生姓名:";
cin>>N;
i=0;
q=P->Next;
while(q)
{
q->stu.getname(M);
if(strcmp(N,M)==0)
i++;
q = q->Next;
}
int j=0,k=1;
if(i==0)
{
cout<<"\n\n\t\t没有这个学生!! 请按任意键返回.."<<endl;
return 1;
}
else if(i>1)
{
cout<<"\n\n\t\t共找到"<<i<<"个姓名为"<<N<<"的学生"<<endl;
cout<<"\t\t选择第几个:";
cin>>k;
}
if(k>i||k<=0)
{

cerr<<"\n\t\t\t输入有误!按任意键继续"<<endl;
return 1;
}
q = P->Next;
j=0;
while(q)
{
q->stu.getname(M);
if(strcmp(N,M)==0)
j++;
if(j==k)
{
if(q->stu.retfactcourse()>=q->stu.retmaxcourse())
{

cout<<"\n\t\t所选课程已满!按任意键继续"<<endl;
return 1;
}
else
{
subjectdb *t=X->Next;
char N1[20];
system("cls");;
if(t!=NULL)
{
cout<<"\n\n\n\t\t所有课程如下:"<<endl;
cout<<"\n\t\t\t\t课程名称\t\t 学分"<<endl;
}
else
{
cerr<<"\n\n\n\t\t对不起,暂时没有课程"<<endl;
return 1;
}
while(t)
{
t->sub.getkname(N1);
cout<<"\t\t\t\t "<<N1<<setw(26-strlen(N1))<<t->sub.readcredit()<<endl;
t = t->Next ;
}
char N2[20];
cout<<"\n\t    输入你所要选的课程 : ";
cin>>N2;
t = X->Next;
while(t)

{
t->sub.getkname(N1);
if(strcmp(N1,N2)==0)
{
if(q->stu.findcourse(N2)==1)
{
cout<<"\n\t\t此课程你已选过了,不能再选.按任意键继续"<<endl;
return 1;
}
t=X->Next;
char NA[20];
while(t)
{
t->sub.getkname(NA);
if(strcmp(NA,N2)==0)
{
if(t->sub.retactivestudent()>=t->sub.retmaxstudent ())
{

cout<<"\n\t\t此课程已选满,不能选.按任意键继续"<<endl;
return 1;
}
}
t = t->Next;
}
q->stu.addcourse(N2,0.0);
cout<<"\n\n\t\t选课成功!按任意键继续"<<endl;
return 1;
}
t = t->Next;
}
cerr<<"\n\t\t没有此课程!按任意键继续"<<endl;
}

return 1;
}
q = q->Next;
}
return 1;
}

int menu_1_2(studentdb *P,subjectdb *X)   //学生情况
{
studentdb *q=P->Next;
char N[20];
system("cls");
cout<<"\n\n\t\t\t\t学生情况操作"<<endl;
int i;
if(q!=NULL)
{
cout<<"\n\n\n\t\t所有学生选课信息如下:\n"<<endl<<endl;
cout<<"\t\t 姓名\t\t\t选课情况\n"<<endl;
}
else
{
cerr<<"\n\n\n\t\t对不起,暂时没有学生名单!!请按任意键继续.."<<endl;
return 1;
}
while(q)
{
q->stu.getname(N);
cout<<"\t\t "<<N<<setw(25-strlen(N))<<" 已选 "<<q->stu.retfactcourse()<<" 门课 "<<endl;
q = q->Next ;
}
char M[20];
cout<<"\n\t\t输入要查看的学生姓名:";
cin>>M;
i=0;
q=P->Next;
while(q)
{
q->stu.getname(N);
if(strcmp(N,M)==0)
i++;
q = q->Next;
}
int j=0,k=1;
if(i==0)
{

cout<<"\n\t\t\t没找到这个学生!!请按任意键继续.."<<endl;
return 1;
}
else if(i>1)
{

cout<<"\n\t\t共找到"<<i<<"个姓名为"<<M<<"的学生"<<endl;
cout<<"\t\t选择第几个:";
cin>>k;
}
if(k>i||k<=0)
{

cerr<<"\n\t\t\t输入有误!按任意键继续.."<<endl;

return 1;
}
q = P->Next;
j=0;
q=P->Next;

while(q)
{
q->stu.getname(N);
if(strcmp(N,M)==0)
j++;
if(j==k)
{
system("cls");;
course *T=q->stu.retroot();
if(T==NULL)
{
cout<<"\n\n\n\t\t\t"<<N<<"同学你还未选课! 请按任意键继续.."<<endl;
return 1;
}
if (T!=NULL)
T = T->Next;
cout<<"\n\n\n\t\t"<<N<<"同学你已选"<<q->stu.retfactcourse()<<"门课,具体如下\n\n"<<endl;
cout<<"\t\t\t课程名称\t\t成绩\n"<<endl;
while(T)
{

cout<<"\t\t\t "<<T->cname<<setw(25-strlen(T->cname))<<T->grade<<endl;
T = T->Next;
}
j=0;
}
q = q->Next;
}
cout<<"\n\t\t请按任意键继续..."<<endl;
return 1;
}
int menu_1_3(subjectdb *P)   //选课情况
{
subjectdb *q=P->Next;
char N[20];
system("cls");
cout<<"\n\n\t\t\t\t选课情况操作"<<endl;

if(q!=NULL)
{
cout<<"\n\n\n\t\t所有选课情况如下:\n"<<endl;
cout<<"\n\t\t\t课程名称\t\t选课人数\n"<<endl;
}
else
{
cerr<<"\n\n\n\t\t对不起,暂时没有课程!!请按任意键继续.."<<endl;
return 1;
}
while(q)
{
q->sub.getkname(N);
cout<<"\t\t\t"<<N<<setw(28-strlen(N))<<q->sub.retactivestudent()<<endl;
q = q->Next ;
}
cout<<"\n\t\t请按任意键继续.."<<endl;
return 1;
}

int menu_1_4(studentdb *X,subjectdb *P)   //退出系统
{
menu_2_9(X,P);
tuichu();
return 0;
}
/////////////////////////////////////////////////////////////////////////////////////
//管理端功能函数
int menu_2_1(studentdb *P)   //增加学生
{
char N[20];
system("cls");;
cout<<"\n\n\t\t\t\t增加学生操作\n"<<endl;
cout<<"\n\n\t\t请输入学生姓名:";
cin>>N;
cout<<endl<<"\t\t增加学生操作成功,按任意键继续"<<endl;
studentdb *newnode = new studentdb;
newnode->Next = P->Next ;
newnode->stu.readname(N);
P->Next = newnode ;
return 1;
}

int menu_2_2(subjectdb *P)   //增加课程
{

float k;
char N[20],M[20];
system("cls");;
cout<<"\n\n\t\t\t\t增加课程操作\n"<<endl;
cout<<"\n\n\t\t 请输入课程名称:";
cin>>N;
cout<<endl;
subjectdb *q = P->Next;
while(q)
{
q->sub.getkname(M);
if(strcmp(N,M)==0)
{
cout<<"\n\t\t此课程已经存在,按任意键继续"<<endl;
return 1;
}
q = q->Next;
}
cout<<"\t\t输入此课程的学分:";
cin>>k;
cout<<"\n\t\t增加课程操作成功,按任意键继续"<<endl;
subjectdb *newnode = new subjectdb;
newnode->Next = P->Next ;
newnode->sub.setkname(N);
newnode->sub.getcredit(k);
P->Next = newnode ;
return 1;
}

int menu_2_3(studentdb *P)   //删除学生
{
system("cls");
cout<<"\n\n\t\t\t\t删除学生操作"<<endl;
menu_2_7(P);
studentdb *q = P->Next;
if(q==NULL)
return 1;
int i;
char N[20],M[20];
cout<<"\n\t请输入要删除的学生姓名 :";
cin>>N;
i=0;
while(q)
{
q->stu.getname(M);
if(strcmp(N,M)==0)
i++;
q = q->Next;
}
int j=0,k=1;
if(i==0)
{

cerr<<"\n\t\t没有这个学生!!请按任意键继续.."<<endl;
return 1;
}
else if(i>1)
{
cout<<"\n\t\t共找到"<<i<<"个姓名为"<<N<<"的学生"<<endl;
cout<<"\n\t\t要删除第几个:";
cin>>k;
}
if(k>i||k<=0)
return 1;
q = P->Next;
studentdb *R = P;
j=0;
while(q)
{
q->stu.getname(M);

if(strcmp(N,M)==0)
j++;
if(j==k)
{
R->Next = q->Next;
free(q);
cout<<"\n\t\t删除学生操作成功,按任意键继续.."<<endl;
return 1;
}
q = q->Next;
R = R->Next;
}
return 1;
}

int menu_2_4(subjectdb *P)   //删除课程
{
subjectdb *q=P->Next;
char N[20];
system("cls");;
cout<<"\n\n\t\t\t\t删除课程操作"<<endl;
if(q!=NULL)
cout<<"\n\n\n\t\t所有课程如下:\n"<<endl;
else
{
cerr<<"\n\n\n\t\t对不起,暂时没有课程!!请按任意键继续.."<<endl;
return 1;
}
while(q)
{
q->sub.getkname(N);
cout<<"\t\t\t\t"<<N<<endl;
q = q->Next ;
}
q = P->Next;
subjectdb *R = P;
if(q==NULL)
return 1;
char M[20];
cout<<"\n\t    请输入要删除的课程 :";
cin>>M;
while(q)
{
q->sub.getkname(N);
if(strcmp(N,M)==0)
{
R->Next = q->Next;
free(q);
cout<<"\n\t\t删除课程操作成功,按任意键继续"<<endl;
return 1;
}
q = q->Next;
R = R->Next;
}

cerr<<"\n\t\t没有此课程!!\t请按任意键继续.."<<endl;
return 1;
}

int menu_2_5(studentdb *X,subjectdb *P)   //填写成绩
{

subjectdb *q=P->Next;
char M[20],N[20],NA[20];
float score;
system("cls");
cout<<"\n\n\t\t\t\t 填写成绩操作\n"<<endl;
if(q!=NULL)
cout<<"\n\t\t\t课程名称\t\t选课人数\n"<<endl;
else
{
cout<<"\n\n\n\t\t对不起,暂时没有任何选修课程。请按任意键继续.."<<endl;
return 1;
}
while(q)
{
q->sub.getkname(N);
cout<<"\t\t\t"<<N<<setw(28-strlen(N))<<q->sub.retactivestudent()<<endl;
q = q->Next ;
}

q = P->Next;
cout<<"\n\t请输入课程名称 :";
cin>>M;
while(q)
{
q->sub.getkname(N);
studentname *K = q->sub.retfirst();
if(K!=NULL)
K = K->Next;
if(strcmp(N,M)==0)
{
system("cls");;
if(K!=NULL)
{
cout<<"\n\n\t\t请填写选修"<<M<<"的学生成绩\n"<<endl;
cout<<"\n\t\t\t姓名\t\t成绩"<<endl;
}
if(K==NULL)
cerr<<"\n\t\t\t无任何信息!!请按任意键继续.."<<endl;
while(K)
{

cout<<"\n\t\t\t"<<K->tname<<"\t\t ";

cin>>score;

studentdb *XX = X->Next;
while(XX)
{
XX->stu.getname(NA);
if(strcmp(NA,K->tname)==0)
XX->stu.wrecourse(M,score);
XX = XX->Next;
}
K = K->Next;
}
if(K==NULL)
cout<<"\n\t\t填写成绩完毕!!请按任意键继续.."<<endl;
return 1;
}
q = q->Next;
}
cerr<<"\n\t\t没有此课程!!请按任意键继续.."<<endl;
return 1;
}

int menu_2_6(subjectdb *P)   //更改学分
{
float k;
system("cls");
cout<<"\n\n\n\t\t\t\t更改学分操作\n"<<endl;
subjectdb *q = P->Next;

char N[20],M[20];
if(q!=NULL)
cout<<"\n\n\n\t\t 所有课程如下:\n"<<endl;
else
{
cerr<<"\n\n\n\t\t对不起,暂时没有任何可选课程。请按任意键继续.."<<endl;
return 1;
}
while(q)
{
q->sub.getkname(N);
cout<<"\t\t\t\t "<<N<<endl;
q = q->Next ;
}
q = P->Next;
cout<<"\n\n\n\t\t请输入要改的课程 :";
cin>>M;
while(q)
{
q->sub.getkname(N);
if(strcmp(N,M)==0)
{

cout<<"\n\t\t\t原来学分为 :"<<q->sub.readcredit()<<endl;
cout<<"\n\t\t\t现要更改为 :";
cin>>k;
q->sub.getcredit(k);
cout<<"\n\t\t更改课程学分成功,按任意键继续"<<endl;
return 1;
}
q = q->Next;
}
cerr<<"\n\t\t无此课程!!请按任意键继续.."<<endl;
return 1;
}

int menu_2_7(studentdb *P)   //学生情况
{
studentdb *q=P->Next;
char N[20];
system("cls");
cout<<"\n\n\n\t\t\t\t学生情况操作\n"<<endl;
if(q!=NULL)
cout<<"\n\n\n\t\t所有学生名单如下:\n"<<endl;
else
{
cerr<<"\n\n\n\t\t对不起,暂时没有学生名单!请按任意键继续.."<<endl;
return 1;
}
while(q)
{
q->stu.getname(N);
cout<<"\t\t\t\t"<<N;
cout<<endl;
q = q->Next ;
}
cout<<"\n\t\t按任意键继续.."<<endl;
return 1;
}

int menu_2_8(subjectdb *P)   //选课情况
{

subjectdb *q = P->Next;
char M[20],N[20];
system("cls");
cout<<"\n\n\t\t\t\t选课情况操作"<<endl;

if(q!=NULL)
{
cout<<"\n\n\n\t\t所有选课情况如下:\n"<<endl;
cout<<"\n\t\t\t课程名称\t\t选课人数\n"<<endl;
}
else
{
cerr<<"\n\n\n\t\t对不起,暂时没有课程!!请按任意键继续.."<<endl;
return 1;
}
while(q)
{
q->sub.getkname(N);
cout<<"\t\t\t"<<N<<setw(28-strlen(N))<<q->sub.retactivestudent()<<endl;
q = q->Next ;
}

q = P->Next;
cout<<"\n\t请输入课程名称 :";
cin>>M;
while(q)
{
q->sub.getkname(N);
studentname *K = q->sub.retfirst();

if(K!=NULL)
K = K->Next;
if(strcmp(N,M)==0)
{
system("cls");;
if(K==NULL)
{
cerr<<"\n\n\t无任何选课信息!!\t请按任意键继续.."<<endl;
return 1;
}
cout<<"\n\n\n\t\t选修"<<M<<"课的学生名单如下:\n"<<endl;
cout<<"\n\t\t\t姓名\t\t 成绩"<<endl;
while(K)
{
cout<<"\n\t\t\t"<<K->tname<<setw(20-strlen(K->tname))<<K->result<<endl;
K = K->Next;
}
cout<<"\n\t\t请按任意键继续.."<<endl;
return 1;
}
q = q->Next;
}

cerr<<"\n\t\t无此课程!!\t请按任意键继续.."<<endl;

return 1;
}

int menu_2_9(studentdb *Y,subjectdb *P)   //保存数据
{
studentdb *Z = Y->Next;
subjectdb *X = P->Next;
system("cls");;
fstream file("subject.txt",ios::out);

while(X)
{
file.write ((char *)&(X->sub),sizeof(X->sub));
X = X->Next;
}
file.close();

fstream file1("student.txt",ios::out);
fstream file2("course.txt",ios::out);
while(Z)
{
file1.write ((char *)&(Z->stu),sizeof(Z->stu));
int time = Z->stu.retfactcourse();
course *co = Z->stu.retroot(),*co1;
if(co!=NULL)
co1 = co->Next;
while(time)
{
file2.write((char *)(co1),sizeof(*co1));
co1 = co1->Next;
time = time - 1;
}
Z = Z->Next;
}
file2.close ();
file1.close();

cout<<"\n\n\n\t\t\t保存数据成功!按任意键继续.."<<endl;
return 1;
}
int menu_2_0()    //退出系统
{
tuichu();
return 0;
}

int main()
{
subjectdb *P = new subjectdb,*Q=P;
P->Next = NULL;
subject M;
fstream file("subject.txt",ios::in);
while(1)
{
file.read((char *)&M,sizeof(M));
if(!file) break;
Q->Next = new subjectdb;
Q->Next ->Next = NULL;
Q->Next ->sub = M;
Q = Q->Next;
}
file.close ();

studentdb *Y = new studentdb,*X=Y;
Y->Next=NULL;
student N;
course O;
fstream file1("student.txt",ios::in);
fstream file2("course.txt",ios::in);
while(1)
{
file1.read((char *)&N,sizeof(N));
if(!file1) break;
Y->Next = new studentdb;
Y->Next ->Next = NULL;
Y->Next ->stu = N;
int time = N.retfactcourse();
Y->Next->stu.clrroot ();
while(time)
{
file2.read ((char *)&O,sizeof(course));
if(!file2) break;
Y->Next->stu.addcourse(O.cname ,O.grade);
time--;
}
Y=Y->Next;
}
file2.close ();
file1.close ();
Q=P->Next;
while(Q)
{
Q->sub.clractivestudnet();
Q->sub.findstudent(X);
Q = Q->Next;
}
char c;
char b;
int br=1;
b = menu();
if(b=='1')
{
while(1)
{
c = custom();
switch(c)
{
case '1':br = menu_1_1(X,P);getch();break; //学生选课
case '2':br = menu_1_2(X,P);getch();break; //学生情况
case '3':br = menu_1_3(P);getch(); break; //选课情况
case '4':br = menu_1_4(X,P);        break; //退出系统
}
if (br == 0)
break;
}
}
if(b=='2')
{
password();
while(1)
{
c = server();
switch(c)
{
case '1':br = menu_2_1(X);getch(); break;   //增加学生
case '2':br = menu_2_2(P);getch(); break;   //增加课程
case '4':br = menu_2_4(P);getch(); break;   //删除课程
case '3':br = menu_2_3(X);getch(); break;   //删除学生
case '5':br = menu_2_5(X,P);getch();break;   //填写成绩
case '6':br = menu_2_6(P);getch(); break;   //更改学分
case '7':br = menu_2_7(X);getch(); break;   //学生情况
case '8':br = menu_2_8(P);getch(); break;   //选课情况
case '9':br = menu_2_9(X,P);getch();break;   //保存数据
case '0':br = menu_2_0();break;              //退出系统
}
if (br == 0)
break;
}
}
return 0;
}