求大神指教 c++程序设计（学生评教系统）

Question

//设计一个学生评教系统，系统主要处理学生评教的相关信息。//其中，学生信息主要包括：学号、姓名、性别、联系电话等内容，//教师信息主要包括:教师编号、教师名称、任教课程编号、任教课程名、评教成绩等内容，//请按照以下的功能要求设计系统。//【功能要求】//（1）定义学生类、教师类、评教类；//（2）输入：学生、教师、评教信息的录入；//（3）输出：学生、教师、评教信息的输出；//（4）编辑功能：可进对学生、教师、评教信息执行查询、修改、添加、删除等操作；//（5）菜单功能：每种功能的操作都是在菜单中进行相应选择；//（6）最好用文件保存信息数据。#include<iostream>#include<fstream>#include<string.h>#include<conio.h>              //用getch();using namespace std;//学生类class student{public:    char Id[20];    char name[10];    char sex[3]; long telephone; student*Next; //student(long xh,char nm[],char sx[],long tel) //{ // xuehao=xh; // strcpy(name, nm); // strcpy(sex, sx); // telephone = tel; //} void newstudent(); void input() { cout << "学号:"; cin >> Id; cout << "姓名:"; cin >> name; cout << "性别:"; cin >> sex; cout << "电话:"; cin >> telephone; } void ReadFile(istream&in) { cin >> Id >> name >> sex >> telephone; } void show() const { cout << "学号" << Id; cout << "姓名" << name; cout << "性别" << sex; cout << "电话" << telephone; }}newstudent;//教师类class teacher{public: long teachernumber; char name[10]; long classnumber; char classname[10]; char commentperformance[100]; /*teacher(long tnum, char nm[], long cnum, char cnm[], char comper[]) { teachernumber = tnum; strcpy(name, nm); classnumber = cnum; strcpy(classname, cnm); strcpy(commentperformance, comper); }*/ void teacherinput() { cout << "教师编号:"; cin >> teachernumber; cout << "教师名称:"; cin >> name; cout << "任教课程编号:"; cin >> classnumber; cout << "任教课程名:"; cin >> classname; cout << "评教成绩:"; cin >> commentperformance; } void show()  { cout << "教师编号:"<< teachernumber; cout << "教师名称:"<< name; cout << "任教课程编号:"<<classnumber; cout << "任教课程名:"<<classname; cout << "评教成绩:"<<commentperformance; }};//评教类class commentsystem{public: commentsystem(); ~commentsystem(); void showmenu(); void showinformation(); void find(); void save(); void modifyinformation(); void removeinformation(); void swap(student*, student*); void display() { for (student*p = Head->Next; p != End;p=p->Next) p->show(); cout << "输入任意字符！继续……"; getch(); } void addinformation() { End->input(); End->Next = newstudent(); End = End->Next; cout << "添加成功!" << endl; cout << "输入任意字符！继续……"; getch(); }private: student*Head, *End; ifstream in; ofstream out; student*FindItem(char*name) { for (student*p = Head; p->Next != End; p = p->Next)//匹配成功则返回上一个指针，不成功就返回空 if (!strcmp(p->Next->name, name))return p; return NULL; } student*FindID(char*Id) { for (student*p = Head; p->Next != End; p = p->Next)//匹配成功则返回上一个指针，不成功就返回空 if (!strcmp(p->Next->Id, Id))return p; return NULL; }};//构造函数commentsystem::commentsystem(){ Head = newstudent; Head->Next = newstudent; End = Head->Next; in.open("D:/sort.txt"); if (!in) cout << "这是一个新系统，无学生信息。请先输入。" << endl; else { while (!in.eof()) { End->ReadFile(in); if (End->name[0] == '\0')break; End->Next = newstudent; End = End->Next; } in.close(); cout << "\t\t读取学生信息成功!" << endl; }}//析构函数commentsystem::~commentsystem(){ save(); for (student*temp; Head->Next != End;) { temp = Head->Next; Head->Next = Head->Next->Next; delete temp; } delete Head, End;}//菜单void commentsystem::showmenu(){ cout << "^^^^^^^^^^学生评教系统^^^^^^^^^^" << endl; cout << "^^^^^^^^^^1.输入学生信息^^^^^^^^^^" << endl; cout << "^^^^^^^^^^2.输入教师信息^^^^^^^^^^" << endl; cout << "^^^^^^^^^^3.输入评教信息^^^^^^^^^^" << endl; cout << "^^^^^^^^^^4.查找信息^^^^^^^^^^" << endl; cout << "^^^^^^^^^^5.删除信息 ^^^^^^^^^^" << endl; cout << "^^^^^^^^^^6.修改信息^^^^^^^^^^" << endl; cout << "^^^^^^^^^^0.退出^^^^^^^^^^" << endl; cout << "请选择：";}//查找函数void commentsystem::find(){ char name[20], Id[10]; int x; student*p = NULL; cout << "\n\t\t*********************************\n"; cout << "\t\t※1.按学生的姓名查找\n\t\t※2.按学生学号查找"; cout << "\n\t\t*********************************\n请选择："; cin >> x; switch (x) { case 1:{cout << "\t\t请输入要查找的学生的姓名："; cin >> name; if (p = FindItem(name)) { p->Next->show(); cout << "输入任意字符！继续……"; getch(); } else { cout << "\t\t没有找到该姓名的学生！" << '\n' << endl; cout << "输入任意字符！继续……"; getch(); } }break;  case 2: { cout << "\t\t请输入要查找的学生的学号："; cin >> Id; if (p = FindID(Id)) { p->Next->show(); cout << "输入任意字符！继续……"; getch(); } else { cout << "\t\t没有找到该学好的学生！" << '\n' << endl; cout << "输入任意字符！继续……"; getch(); } }break; default:cout << "输入有误"; }}//修改信息void commentsystem::modifyinformation()//修改信息{ char name[20]; student*p = NULL; cout << "\t\t请输入要修改的人的姓名:"; cin >> name; if (p = FindItem(name)) { cout << "\t\t已找到学生的信息，请输入新的信息!" << endl; p->Next->input(); cout << "修改成功！" << endl; cout << "输入任意字符！继续……"; getch(); } else { cout << "\t\t没有找到!" << endl; cout << "输入任意字符！继续……"; getch(); }}//删除信息void commentsystem::removeinformation()//删除信息{ char name[20]; student*p = NULL, *temp = NULL; cout << "\t\t请输入要删除的学生的姓名:" << endl; cin >> name; if (p = FindItem(name)) { temp = p->Next; p->Next = p->Next->Next; delete temp; cout << "\t\t删除成功!" << endl; cout << "输入任意字符！继续……"; getch(); } else { cout << "\t\t没有找到!" << endl; cout << "输入任意字符！继续……"; getch(); }}//保存函数void commentsystem::save(){ out.open("sort.txt"); for (student*p = Head->Next; p != End; p = p->Next) out << p->name << "\t" << p->Id << "\t" << p->sex << "\t" << p->telephone << '\n'; out.close();}//主函数int main(){ int x, i = 0; bool quit = false; cout << "\t\t§§§§§§§§§§§§§§§§§§§§§§§§§§" << endl; for (i = 0; i<3; i++) cout << "\t\t◎\t\t\t\t\t\t◎" << endl; cout << "\t\t◎★★★★【欢迎进入学生成绩管理系统】★★★★◎" << endl; for (i = 0; i<3; i++) cout << "\t\t◎\t\t\t\t\t\t◎" << endl; cout << "\t\t§§§§§§§§§§§§§§§§§§§§§§§§§§\n" << endl;; commentsystem Grade; cout << "按任意键开始……"; getch(); while (!quit) { system("cls"); Grade.showmenu(); cin >> x; switch (x) { case 0:quit = true; break; case 1:Grade.addinformation(); break; case 2:Grade.display(); break; case 4:Grade.find(); break; case 5:Grade.removeinformation(); break; case 6:Grade.modifyinformation(); break; default:cout << "输入有误"; } } return 0;}