救救孩子吧，有没有好心人帮我修改这个代码（C++），也是给自己锻炼的机会哟。解决的可以加我v18259862278。给予酬劳，这上面一充就是100还是V方便

Question

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;
 }

Answer 1

。。。。。Save()函数写的只能在屏幕上输出，没有往文件里输出，而且那个FILE*fp 最后没有关闭。