这是代码，然后最后面的保存学生信息为文件功能不太完整，最后保存的文档功能实现不了，保存后没有数据可以存到文档里，希望有人可以指导指导，谢谢。
#include<fstream> #include <iostream> #include <string> using namespace std; #define null NULL class student { private: friend class studentMessage; student *next; //节点指针 string name; //学生姓名 int age; //年纪 int id; //学号 double score[5]; //五科成绩 double total; //总分 double average; //平均成绩 public: student(string _name,int _age,int _id,double *_score) { name = _name; age = _age; id = _id; score[0] = _score[0]; score[1] = _score[1]; score[2] = _score[2]; score[3] = _score[3]; score[4] = _score[4]; total = score[0]+score[1]+score[2]+score[3]+score[4]; average = total/5; next = NULL; } student() //为studentMessage初始化头结点用 { name = "null"; age = 0; id = 0; score[0]=score[1]=score[2]=score[3]=score[4]=0; total = 0; average = 0; next = NULL; } ~student(){} void swap(student*); }; void student::swap(student *q) { string _name; int _age,_id; double _score[5],_total,_average; _name = name; name = q->name; q->name = _name; _age = age; age = q->age; q->age = _age; _id = id; id = q->id; q->id = _id; _score[0] = score[0]; score[0] = q->score[0]; q->score[0] = _score[0]; _score[1] = score[1]; score[1] = q->score[1]; q->score[1] = _score[1]; _score[2] = score[2]; score[2] = q->score[2]; q->score[2] = _score[2]; _score[3] = score[3]; score[3] = q->score[3]; q->score[3] = _score[3]; _score[4] = score[4]; score[4] = q->score[4]; q->score[4] = _score[4]; _total = total; total = q->total; q->total = _total; _average = average; average = q->average; q->average = _average; } class studentMessage { private: student *first; //头指针 int num; //信息中的学生人数 public: studentMessage() { num = 0; //初始化学生人数为0 first = new student; //初始化头结点 } ~studentMessage(){delete first;} void Insret(void); //添加 void Display(void); //显示 void Delete(void); //删除 void Search(void); //搜索 void Change(void); //改动 void sortByLesson1(void); //按成绩一来排序 void sortByLesson2(void); //按成绩二来排序 void sortByLesson3(void); //按成绩三来排序 void sortByLesson4(void); //按成绩四来排序 void sortByLesson5(void); //按成绩五来排序 void sortByTotal(void); //按总分来排序 void SearchByid(void); //按照学号查找 void SearchByname(void); //按照姓名查找 int menu(void); //初始的菜单 void clear(void); //清空列表 void Save(void);//保存文件 }; int studentMessage::menu(void) { int ch; cout<<"**********************************************************************"<<endl; cout<<"======================================================================"<<endl; cout<<"***************************学生成绩管理系统***************************"<<endl;cout<<endl; cout<<"1.显示所有学生成绩"<<endl; cout<<"2.添加学生信息"<<endl; cout<<"3.查询学生信息"<<endl; cout<<"4.修改学生信息"<<endl; cout<<"5.删除最后一个学生信息"<<endl; cout<<"6.删除所有信息"<<endl; cout<<"7.保存文件"<<endl; cout<<"0.退出系统"<<endl;cout<<endl; cout<<"********************计算机科学与技术一班 黄烨彬，陈深**************************"<<endl; cout<<"======================================================================="<<endl; cout<<"***********************************************************************"<<endl; cin >> ch; cout<<"\n\n\n"<<endl; return ch; } //添加 void studentMessage::Insret(void) { string name; int age; int id; double score[5]; cout<<"请输入学生姓名: "; cin>>name; cout<<"请输入学生年龄: "; cin>>age; cout<<"请输入学生学号: "; cin>>id; cout<<"下面请输入学生五门课程成绩: "; cout<<endl; cout<<"请输入学生的高等数学的成绩: ";cin>>score[0]; cout<<"请输入学生的英语成绩: ";cin>>score[1]; cout<<"请输入学生的面向对象成绩: ";cin>>score[2]; cout<<"请输入学生的电路原理成绩";cin>>score[3] ; cout<<"请输入学生的离散数学成绩";cin>>score[4]; cout<<endl; student *newstu = new student(name,age,id,score); student *p = first; while(p->next != NULL) { p = p->next; } p->next = newstu; newstu->next = null; num++; } void studentMessage::Display(void) { if(num == 0) { cout<<"当前记录中无学生..."<<endl; } else { student *p = first->next; while(p != null) { cout<<"姓名:"<<p->name<<" "; cout<<"年龄:"<<p->age<<" "; cout<<"学号:"<<p->id<<" "; cout<<"五门课程成绩: "<<p->score[0]<<" "<<p->score[1]<<" "<<p->score[2]<<" "<<p->score[3]<<" "<<p->score[4]<<" "; cout<<"总分:"<<p->total<<" "; cout<<"平均分:"<<p->average<<endl; p = p->next; } } } void studentMessage::Delete(void) { student *p = first; student *pre = first; while(p->next != NULL) { pre = p; p = p->next; } pre->next = NULL; delete p; num--; } void studentMessage::Search(void) { int temp = 0; cout<<"请输入查找的条件，有如下选项..."<<endl; cout<<"按照学号查找（请输入【1】） 按照姓名查找（请输入【2】）"<<endl; cin>>temp; switch(temp) { case 1: SearchByid(); break; case 2: SearchByname(); break; default: cout<<"输入有误..."<<endl; } } void studentMessage::SearchByid(void) { int _id; int flag = 0; cout<<"请输入待查找学生的学号："; cin >> _id; student *p = first->next; while(p != null) { if(p->id == _id) { flag = 1; cout<<"下面是查找匹配结果："<<endl; cout<<"姓名:"<<p->name<<" "; cout<<"年龄:"<<p->age<<" "; cout<<"学号:"<<p->id<<" "; cout<<"三门课程成绩: "<<p->score[0]<<" "<<p->score[1]<<" "<<p->score[2]<<" "; cout<<"总分:"<<p->total<<" "; cout<<"平均分:"<<p->average<<endl; } p = p->next; } if(flag == 0) { cout<<"抱歉，记录中没有查找匹配项..."<<endl; } } void studentMessage::SearchByname(void) { string _name; int flag = 0; cout<<"请输入待查找的学生姓名: "; cin >> _name; student *p = first->next; while(p != null) { if(p->name == _name) { flag = 1; cout<<"下面是查找匹配结果："<<endl; cout<<"姓名:"<<p->name<<" "; cout<<"年龄:"<<p->age<<" "; cout<<"学号:"<<p->id<<" "; cout<<"五门课程成绩: "<<p->score[0]<<" "<<p->score[1]<<" "<<p->score[2]<<" "<<p->score[3]<<" "<<p->score[4]<<" "; cout<<"总分:"<<p->total<<" "; cout<<"平均分:"<<p->average<<endl; } p = p->next; } if(flag == 0) { cout<<"抱歉，记录中没有查找匹配项..."<<endl; } } void studentMessage::Change(void) { string _name; int flag = 0,temp; int _id,_age; int course = 0; cout<<"请输入需要改动信息的学生的姓名: "; cin >> _name; student *p = first->next; while(p != null) { if(p->name == _name) { flag = 1; cout<<"该学生当前信息如下："<<endl; cout<<"姓名:"<<p->name<<" "; cout<<"年龄:"<<p->age<<" "; cout<<"学号:"<<p->id<<" "; cout<<"五门课程成绩: "<<p->score[0]<<" "<<p->score[1]<<" "<<p->score[2]<<" "<<p->score[3]<<" "<<p->score[4]<<" "; cout<<"总分:"<<p->total<<" "; cout<<"平均分:"<<p->average<<endl; cout<<"请指明哪一项需要修改..."<<endl; cout<<"修改学号（输入【1】） 修改年龄（输入【2】）修改成绩（输入【3】）"<<endl; cin >> temp; switch(temp) { case 1: { cout<<"请输入新的学号：";cin>>_id; p->id = _id; } break; case 2: { cout<<"请输入新的年龄：";cin>>_age; p->age = _age; } break; case 3: { cout<<"请按指示修改课程成绩..."<<endl; cout<<"是否需要修改高等数学成绩？（需要输入【1】不需要输入【0】）"<<endl; cin >> course; if(course == 1) { cout<<"请输入修改后的高等数学成绩："; cin >> p->score[0]; } course = 0; cout<<"是否需要修改英语成绩？（需要输入【1】不需要输入【0】）"<<endl; cin >> course; if(course == 1) { cout<<"请输入修改后的英语成绩："; cin >> p->score[1]; } course = 0; cout<<"是否需要修改电路原理成绩？（需要输入【1】不需要输入【0】）"<<endl; cin >> course; if(course == 1) { cout<<"请输入修改后的电路原理成绩："; cin >> p->score[2]; } course = 0; p->total = p->score[0]+p->score[1]+p->score[2]+p->score[3]+p->score[4]; p->average = p->total/3; cout<<"修改后的信息如下： "<<endl; cout<<"姓名:"<<p->name<<" "; cout<<"年龄:"<<p->age<<" "; cout<<"学号:"<<p->id<<" "; cout<<"五门课程成绩: "<<p->score[0]<<" "<<p->score[1]<<" "<<p->score[2]<<" "<<p->score[3]<<" "<<p->score[4]<<" "; cout<<"总分:"<<p->total<<" "; cout<<"平均分:"<<p->average<<endl; } break; default: cout<<"输入有误..."<<endl; } } p = p->next; } if(flag == 0) cout<<"当前记录中没有次学生..."<<endl; } /*排序我均采用冒泡排序法，均是从小到大排序*/ //按照科目一排序 void studentMessage::sortByLesson1(void) { student *p = first->next; while(p->next != null) { student *q = p->next; while(q != null) { if(p->score[0] > q->score[0]) { p->swap(q); } q = q->next; } p = p->next; } } //按照科目二排序 void studentMessage::sortByLesson2(void) { student *p = first->next; while(p->next != null) { student *q = p->next; while(q != null) { if(p->score[1] > q->score[1]) { p->swap(q); } q = q->next; } p = p->next; } } //按照科目三排序 void studentMessage::sortByLesson3(void) { student *p = first->next; while(p->next != null) { student *q = p->next; while(q != null) { if(p->score[2] > q->score[2]) { p->swap(q); } q = q->next; } p = p->next; } } //按照科目四排序 void studentMessage::sortByLesson4(void) { student *p = first->next; while(p->next != null) { student *q = p->next; while(q != null) { if(p->score[3] > q->score[3]) { p->swap(q); } q = q->next; } p = p->next; } } //按照科目五排序 void studentMessage::sortByLesson5(void) { student *p = first->next; while(p->next != null) { student *q = p->next; while(q != null) { if(p->score[4] > q->score[4]) { p->swap(q); } q = q->next; } p = p->next; } } //按照总成绩排序 void studentMessage::sortByTotal(void) { student *p = first->next; while(p->next != null) { student *q = p->next; while(q != null) { if(p->total > q->total) { p->swap(q); } q = q->next; } p = p->next; } } void studentMessage::clear(void) { student *p = first->next; while(p != null) { first->next = p->next; p->next = null; delete p; p = first->next; } } /*保存学生信息*/ void studentMessage::Save(void) {int i; FILE *fp; fp=fopen("chengji.txt","w"); student *p = first->next; while(p != null) { cout<<"姓名:"<<p->name<<" "; cout<<"年龄:"<<p->age<<" "; cout<<"学号:"<<p->id<<" "; cout<<"五门课程成绩: "<<p->score[0]<<" "<<p->score[1]<<" "<<p->score[2]<<" "<<p->score[3]<<" "<<p->score[4]<<" "; cout<<"总分:"<<p->total<<" "; cout<<"平均分:"<<p->average<<endl; p = p->next; } cout<<"\n\n*******************恭喜，保存完成！*******************\n\n"<<endl; } int main() { studentMessage stulist; int ch; while(ch = stulist.menu()) { switch(ch) { case 1: stulist.Display(); break; case 2: stulist.Insret(); break; case 3: stulist.Search(); break; case 4: stulist.Change(); break; case 5: stulist.Delete(); break; case 6: stulist.clear(); break; case 7: stulist.Save(); break; default: cout<<"请按要求输入..."<<endl; } } return 0; }