C_C++课程设计_选题管理系统

课程设计选题管理系统作者:admin 日期:2008-05-23

/*设计学生类；课程设计题目类（序号，题目，人数，描述）；每个题目限两个人选；要求使用面向对象编程进行模拟课程设计选题；要求以链表格式存储，信息保存在文件中。主要包括下列模块：

1．新增、修改、删除课程设计题目；

2．新增、修改、删除学生信息；

3．查询课程设计内容；

4．课程设计选题；*/

#include

#include

#include

using namespace std;

class Student

{

long num;

char name[20];

char subject[30];

Student *Next;

Student *Head;

public:

int Creat()

{

FILE *fp;

Head = NULL; //存放链表的起始地址

Student *p, *pEnd;

p = new Student; //创建一个Teacher的动态对象

if((fp=fopen("Student.txt","r"))==NULL)

{

cout << "can not open file!" << endl;

exit(0);

}

fscanf(fp,"%ld%s%s",&p->num,p->name,p->subject); //输入指针p指向的对象的数据成员的值

pEnd = Head; // 存放当前对象的地址

while(!feof(fp))

{ // 0 是输入结束的标志

if(NULL == Head)

Head = p; // 只在第一次执行此语句

else

pEnd->Next = p; // 存放下一个对象的地址

pEnd = p;

p = new Student; //动态创建下一个对象

fscanf(fp,"%ld%s%s",&p->num,p->name,p->subject); //输入下一个对象数据成

员的值

}

pEnd->Next = NULL;

return 0;

}

int Newstudent()

{

FILE *fp;

cout << "请输入增加的学生的相关信息: " << endl;

cout << "学号: " ;

cin >> num ;

cout << endl;

cout << "姓名: " ;

cin >> name;

cout << endl;

cout << "已选课程设计题目: " ;

cin >> subject;

cout << endl;

if((fp=fopen("student.txt","a"))==NULL)

{

cout << "can not open file!" << endl;

exit(0);

}

fprintf(fp,"%ld %s %s\n",num,name,subject);

fclose (fp);

return 0;

}

int Modify()//修改

{

FILE *fp;

Student *p;

char namer[20];

Creat();

cout << "请输入要修改的姓名:";

cin >> namer;

cout << endl;

if(Head!=NULL)

{

p=Head;

while(strcmp(namer,p->name))

{

p=p->Next;

if(p==NULL)

break;

if(p!=NULL)

{

cout << "你要修改的学生的相关信息如下:" << endl << endl;

cout << p->num << ' ' << p->name << ' ' << p->subject << endl << endl;

cout << "请输入修改后的相关信息:" << endl << endl;

cout << "请输入修改后的学生的学号: ";

cin >> p->num;

cout << endl;

cout << "请输入修改后的姓名: ";

cin >> p->name;

cout << endl;

cout << "请输入修改后的所选题目: ";

cin >> p->subject;

cout << endl;

if((fp=fopen("Student.txt","w"))==NULL)

{

cout << "can not open file!" << endl;

exit(0);

}

p=Head;

if(Head!=NULL)

do

{

fprintf(fp,"%ld %s %s\n",p->num,p->name,p->subject);

p=p->Next;

}

while(p!=NULL);

fclose (fp);

}

else

cout << "没有找到你想要修改的题目的信息" <

}

else

cout << "文件中还没有任何题目"<

return 0;

}

int Del()//删除

{

FILE *fp;

Student *p,*p1;

char namer[30];

cout << "请输入要删除的学生的姓名:";

cin >> namer;

cout << endl;

if(Head!=NULL)

{

p=Head;

while(strcmp(namer,p->name))

{

p1=p;

p=p->Next;

if(p==NULL)

break;

}

if(p!=NULL)

{

cout << "你要删除的题目的相关信息如下:" << endl;

cout << " 姓名: " << p->name<< endl;

cout << " 学号: " << p->num << endl;

cout << "所选题目: " << p->subject << endl;

system("pause");

if(p==Head)Head=p->Next;

else

p1->Next=p->Next;

if((fp=fopen("Student.txt","w"))==NULL)

{

cout << "can not open file!" << endl;

exit(0);

}

p=Head;

if(Head!=NULL)

do

{

fprintf(fp,"%ld %s %s\n",p->num,p->name,p->subject);

p=p->Next;

}

while(p!=NULL);

fclose (fp);

cout << "该学生的所有信息已被删除!" << endl;

}

else

cout << "没有找到你想要删除的学生的信息" <

}

cout << "文件中还没有任何学生的信息"<

return 0;

}

};

class

Subject//*********************************************************************** ****************

{

int serial_number;//序号

char subject[30]; //题目

int peoples;//限定人数

int people;//已选人数

char description[100];//描述

Subject *next;

Subject *head;

public:

int Chosesubject();

int creat();

int newsubject();

int modify();

int del();

int demand();

};

int Subject::creat()

{

FILE *fp;

head = NULL; //存放链表的起始地址

Subject *p, *pEnd;

p = new Subject; //创建一个Teacher的动态对象

if((fp=fopen("Subject.txt","r"))==NULL)

{

cout << "can not open file!" << endl;

exit(0);

}

fscanf(fp,"%d%s%d%s%d",&p->serial_number,p->subject,&p->peoples,p->description,&p->peo ple); //输入指针p指向的对象的数据成员的值

pEnd = head; // 存放当前对象的地址

while(!feof(fp))

{ // 0 是输入结束的标志

if(NULL == head)

head = p; // 只在第一次执行此语句

else

pEnd->next = p; // 存放下一个对象的地址

pEnd = p;

p = new Subject; //动态创建下一个对象

fscanf(fp,"%d%s%d%s%d",&p->serial_number,p->subject,&p->peoples,p->description,&p->peo ple); //输入下一个对象数据成员的值

}

pEnd->next = NULL;

return 0;

}

int Subject::newsubject()//************************************增加

{

FILE *fp;

cout << "请输入要增加的题目的序号:";

cin >> serial_number;

cout << endl;

cout << "请输入要增加的题目:";

cin >> subject;

cout << endl;

cout << "请输入要增加的题目的人数限定:";

cin >> peoples;

cout << endl;

cout << "请输入要增加的题目的描述::";

cin >> description;

cout << endl;

cout << "请输入要增加的题目的已选人数:";

cin >> people;

cout << endl;

if((fp=fopen("Subject.txt","a"))==NULL)

{

cout << "can not open file!" << endl;

exit(0);

}

fprintf(fp,"%d %s %d %s %d\n",serial_number,subject,peoples,description,people);

return 0;

}

int Subject::modify()//*****************************修改

{

FILE *fp;

Subject *p;

char sub[30];

creat();

cout << "请输入要修改的题目:";

cin >> sub;

cout << endl;

if(head!=NULL)

{

p=head;

while(strcmp(sub,p->subject))

{

p=p->next;

if(p==NULL)

break;

}

if(p!=NULL)

{

cout << "你要修改的题目的相关信息如下:" << endl;

cout << p->serial_number << ' ' << p->subject << ' ' << p->people << ' ' << p->description << endl;

cout << "请输入修改后的相关信息:" << endl;

cout << "请输入修改后的题目的序号:";

cin >> p->serial_number;

cout << endl;

cout << "请输入修改后的题目:";

cin >> p->subject;

cout << endl;

cout << "请输入修改后的题目的人数限定:";

cin >> p->peoples;

cout << endl;

cout << "请输入修改后的题目的描述::";

cin >> p->description;

cout << endl;

cout << "请输入修改后的题目的已选人数:";

cin >> p->people;

cout << endl;

if((fp=fopen("Subject.txt","w"))==NULL)

{

cout << "can not open file!" << endl;

exit(0);

}

p=head;

if(head!=NULL)

do

{

fprintf(fp,"%d %s %d %s %d\n",p->serial_number,p->subject,p->peoples,p->description,p->peopl e);

p=p->next;

}

while(p!=NULL);

fclose (fp);

}

else

cout << "没有找到你想要修改的题目的信息" <

}

else

cout << "文件中还没有任何题目"<

return 0;

}

int Subject::del()//****************************************删除{

FILE *fp;

Subject *p,*p1;

char sub[30];

creat();

cout << "请输入要删除的题目:";

cin >> sub;

cout << endl;

if(head!=NULL)

{

p=head;

while(strcmp(sub,p->subject))

{

p1=p;

p=p->next;

if(p==NULL)

break;

}

if(p!=NULL)

{

cout << "你要删除的题目的相关信息如下:" << endl;

cout << " 序号: " << p->serial_number << endl;

cout << " 题目: " << p->subject << endl;

cout << "限定人数: " << p->peoples << endl;

cout << "题目描述: " << p->description << endl;

cout << "已选人数: " << p->people << endl;

system("pause");

if(p==head)head=p->next;

else

p1->next=p->next;

if((fp=fopen("Subject.txt","w"))==NULL)

{

cout << "can not open file!" << endl;

exit(0);

}

p=head;

if(head!=NULL)

do

{

fprintf(fp,"%d %s %d %s %d\n",p->serial_number,p->subject,p->peoples,p->description,p->peopl e);

p=p->next;

}

while(p!=NULL);

fclose (fp);

cout << "该题目的所有信息已被删除!" << endl;

}

else

cout << "没有找到你想要删除的题目的信息" <

}

else

cout << "文件中还没有任何题目"<

return 0;

}

int Subject::demand()//***************************************查询课程设计题目

{

Subject *p,*p1;

char sub[30];

creat();

cout << "所有题目列表如下" << endl;

p=head;

while(p != NULL)

{

cout << "序号: " << p->serial_number << "题目: " << p->subject << endl;

cout << endl;

p = p->next;

}

cout << " 请输入你想要查看的题目: " ;

cin >> sub;

cout << endl;

if(head!=NULL)

{

p=head;

while(strcmp(sub,p->subject))

{

p1=p;

p=p->next;

if(p==NULL)

break;

}

if(p!=NULL)

cout << "关于该题目有如下描述:"<< endl << p->description << endl;

else

cout << "没有找到你想要修改的题目的信息" <

}

else

cout << "文件中还没有任何题目"<

return 0;

}

int Subject::Chosesubject()

{

FILE *fp;

Subject *p,*p1;

char sub[30];

creat();

cout << "请输入你要选择的题目: ";

cin >> sub;

cout << endl;

if(head!=NULL)

{

p=head;

while(strcmp(sub,p->subject))

{

p1=p;

p=p->next;

if(p==NULL)

break;

}

if(p!=NULL)

{

if(p->people>=p->peoples)

{

cout << "人数超限!你不能再选择此题目!" << endl;

exit(0);

}

Student a;

a.Newstudent();

p->people++;

if((fp=fopen("Subject.txt","w"))==NULL)

{

cout << "can not open file!" << endl;

exit(0);

}

p=head;

if(head!=NULL)

do

{

fprintf(fp,"%d %s %d %s %d\n",p->serial_number,p->subject,p->peoples,p->description,p->peopl e);

p=p->next;

}

while(p!=NULL);

cout << "****选题成功!***" << endl;

fclose (fp);

}

else

cout << "没有找到你想要修改的题目的信息" <

}

else

cout << "文件中还没有任何题目"<

return 0;

}

int main()

{

system("color 1d");

Subject a;

Student b;

char choice;

cout<<"\n\n\t ★欢迎使用课程设计选课系统★\n\n";

cout<<"\t1.★★★★添加新的科目★★★★★★★★★\n";

cout<<"\t2.********删除所选内容******************\n";

cout<<"\t3.★★★★修改课程设计信息★★★★★★★\n";

cout<<"\t4.********添加新的学生的相关信息********\n";

cout<<"\t5.★★★★删除学生记录★★★★★★★★★\n\n\n";

cout<<"\t6.********修改学生相关信息**************\n";

cout<<"\t7.★★★★查询课程设计内容★★★★★★★\n";

cout<<"\t8.********进行课程设计选课**************\n";

cout<<"\t0.★★★★退出系统★★★★★★★★★★★\n\n\n";

cout<<"\t ★***制作人:肖涛***★\n\n\n"; cout<<"\t ★**指导老师:范永全***★\n\n\n"; cout<<"请输入您的选择：";

cin>>choice;

if(choice=='0')

exit(0);

else

if(choice=='1')

{ a.newsubject();

system("pause");

main();

}

else if(choice=='2')

{a.del();

system("pause");

main();}

else if(choice=='3')

{a.modify();

system("pause");

main();}

else if(choice=='4')

{b.Newstudent();

system("pause");

main();}

else

if(choice=='5')

{b.Del();

system("pause");

main();}

else if(choice=='6')

{b.Modify();

system("pause");

main();}

else if(choice=='7')

{a.demand();

system("pause");

main();}

else if(choice=='8')

{a.Chosesubject();

system("pause");

main();}

else

cout<<"输入错误，请重新输入您的选择："; system("pause");

main();

}

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