学生成绩管理系统（cpp）

#include <iostream> #include <string.h> #include <fstream> #include <conio.h> #include <Windows.h> #include <string> using namespace std; string ID; //定义全局的变量 class Student { //定义学生类 protected: string Number; char Name[30]; char Sex[10]; string Age; Student *next; float Grade1; float Grade2; float Grade3; public: Student(string ID, char *Name, char *Sex, string Age, float Grade1, float Grade2, float Grade3) { //构造函数 strcpy_s(this->Name, Name); strcpy_s(this->Sex, Sex); this->Grade1 = Grade1; this->Grade2 = Grade2; this->Grade3 = Grade3; this->Number = ID; this->Age = Age; } friend class Teacher; }; class Teacher { //定义友元类 private: Student *student; public: Teacher() { //构造函数 student = 0; Load(); } ~Teacher() { //析构函数 Student *s; s = student; while (s) { s = s->next; delete student; student = s; } student = 0; } void Find(char Name[20]); //名字查找 void Find(string ID); //ID查找 void Add(); //添加信息 void Delete(); //删除信息 void Modify(string ID); //修改信息 void Query(); //查询信息 void Save(); //保存数据 void Load(); //读入数据 void Look();//预览 void TJ(); //统计 void DesTory(); void Output(Student *s) //输出函数 { cout << "\t\t学号: " << s->Number << endl; cout << "\t\t姓名: " << s->Name << endl; cout << "\t\t性别: " << s->Sex << endl; cout << "\t\t年龄: " << s->Age << endl; cout << "\t\t实验成绩: " << s->Grade1 << endl; cout << "\t\t考勤成绩: " << s->Grade2 << endl; cout << "\t\t报告成绩: " << s->Grade3 << endl; cout << endl; } }; void Teacher::Add() //添加成绩的信息 { system("cls"); Student *s, *s2; //新结点指针 string Number, Age; float Grade1; float Grade2; float Grade3; char Name[20], Sex[10]; char c; cout << "\n新增学生成绩\n"; //输入学生信息 cout << "输入学号:\t"; cin >> Number; cout << endl; { Student *s1; s1 = student; while (s1) { if (s1->Number == Number) //判断学号是否已经存在 { break; } else { s1 = s1->next; } } if (s1 != NULL) { cout << "该学号已存在,是否修改该学生信息(Y/N) " << endl; cin >> c; if (toupper(c) == 'Y') { cout << "该学生信息为:" << endl; Find(Number); cout << endl; Modify(Number); return; } else return; } } cout << "输入姓名:\t"; cin >> Name; cout << endl; cout << "输入性别:\t"; cin >> Sex; cout << endl; cout << "输入年龄:\t"; cin >> Age; cout << endl; cout << "输入实验成绩:\t"; cout << endl; cin >> Grade1; cout << "输入考勤成绩:\t"; cout << endl; cin >> Grade2; cout << "输入报告成绩:\t"; cout << endl; cin >> Grade3; cout << endl; s = new Student(Number, Name, Sex, Age, Grade1, Grade2, Grade3); s->next = 0; //学生结点加入链表 if (student) //若已经存在结点 { s2 = student; while (s2->next) //查找尾结点 { s2 = s2->next; } s2->next = s; //连接 } else //若不存在结点(表空) { student = s; //连接 } system("cls"); cout << "\t\t\t 添加成功\n" << endl; cout << "是否继续添加(Y/N) " << endl; cin >> c; if (toupper(c) == 'Y') { Add(); return; } else return; } void Teacher::Delete() //删除人员 { system("cls"); char c; string Number; cout << "\n删除信息\n"; cout << "输入要删除的学生ID:\t"; cin >> Number; cout << endl; //查找要删除的结点 Student *s1, *s2; s1 = student; s2 = 0; while (s1) { if (s1->Number == Number) break; else { s2 = s1; s1 = s1->next; } } //删除结点 if (s1 != NULL)//若找到结点，则删除 { cout << "所要删除的学生的信息如下:\n" << endl; Output(s1); cout << "确定是否删除(Y/N): "; cin >> c; if (toupper(c) != 'Y') return; // system("pause"); if (s1 == student) //若要删除的结点是第一个结点 { student = s1->next; delete s1; } else //若要删除的结点是后续结点 { s2->next = s1->next; delete s1; } cout << "\t\t删除成功\n"; cout << "是否继续删除(Y/N) " << endl; cin >> c; if (toupper(c) == 'Y') { Delete(); return; } else return; } else //未找到结点 cout << "未找到该学生!\n"; _getch(); } void Teacher::Modify(string ID) { Student *s1; char c; s1 = student; while (s1) { if (s1->Number == ID) break; else { s1 = s1->next; } } if (s1 != NULL)//若找到结点 { system("cls"); cout << "所要修改的学生的信息如下:\n" << endl; Output(s1); do { cout << "1. 修改姓名 2. 修改性别 3. 修改年龄 4. 修改实验成绩 5. 修改考勤成绩 6. 修改报告成绩 7. 退出修改 \n" << endl; cout << "请选择(1-5)要修改的信息\n" << endl; cin >> c; if (c != '5') cout << "请输入新的信息: "; switch (c) { case '1': cin >> s1->Name; break; case '2': cin >> s1->Sex; break; case '3': cin >> s1->Age; break; case '4': cin >> s1->Grade1; break; case '5': cin >> s1->Grade2; break; case '6': cin >> s1->Grade3; break; default: break; } } while (c != '7'); system("cls"); cout << "\t修改成功\n" << endl; cout << "是否继续修改(Y/N): " << endl; cin >> c; if (toupper(c) == 'Y') { cout << "请输入要修改人员的ID: "; cin >> ID; cout << endl; Modify(ID); return; } else return; } else //未找到结点 cout << "未找到该学生!\n"; _getch(); } void Teacher::Save() //数据写入到文件 { ofstream fStudent("Student.txt", ios::out | ios::binary); char c; cout << "\n保存数据,是否继续?[Y/N]:"; cin >> c; if (toupper(c) != 'Y') return; Student *s = student; while (s) { fStudent << s->Number << " " << s->Name << " " << s->Sex << " " << s->Age << " " << s->Grade1 << " " << s->Grade2 << " " << s->Grade3 << " " << endl; s = s->next; } fStudent.close(); cout << "\n保存成功！\n"; system("pause"); } void Teacher::Load() //数据读入 { ifstream fStudent; Student *s = student; string Number, Age; float Grade1; float Grade2; float Grade3; char Name[20], Sex[10]; fStudent.open("Student.dat", ios::in | ios::binary); fStudent >> Number >> Name >> Sex >> Age >> Grade1 >> Grade2 >> Grade3; while (fStudent.good()) { s = new Student(Number, Name, Sex, Age, Grade1, Grade2, Grade3); s->next = 0; //学生的结点加入链表 if (student) //若已经存在结点 { Student *s2; s2 = student; while (s2->next) //查找尾结点 { s2 = s2->next; } s2->next = s; //连接 } else //若不存在结点(表空) { student = s; //连接 } fStudent >> Number >> Name >> Sex >> Age >> Grade1 >> Grade2 >> Grade3; } fStudent.close(); } void Teacher::Find(string ID) //按照ID进行查找 { Student *s1; s1 = student; while (s1) { if (s1->Number == ID) break; else { s1 = s1->next; } } if (s1 != NULL) { Output(s1); } else cout << "未找到该学生" << endl; } void Teacher::Find(char Name[20]) //按照名字查找 { Student *s1; int count = 0; s1 = student; while (s1) { if (strcmp(s1->Name, Name) == 0) { count++; Output(s1); } s1 = s1->next; } if (count) { cout << "\t查询成功!!!" << endl; cout << "\n共找到 " << count << " 个名字为 " << Name << " 的同学\n" << endl; } else cout << "\n\t\t未找到该学生!!!\n" << endl; } void Teacher::Query() //查找的方式 { char c; string ID, Grade1, Grade2, Grade3; char Name[20]; do { cout << "1.按学号查找\n2.按名字查找\n3.退出查找" << endl; cin >> c; // system("cls"); cout << endl; switch (c) { case '1': { cout << "输入学号: "; cin >> ID; Find(ID); }; break; case '2': { cout << "输入姓名: "; cin >> Name; Find(Name); }; break; case '3':break; default: cout << "输入有误 请重新输入!!!\n" << endl; } } while (c != '1'&&c != '2'&&c != '3'&&c