学生成绩管理系统（C++指针、链表、文件及面向对象的运用）

                                                                                   学生成绩管理系统

功能页面显示：

  

实现源码：

#include<iostream>
#include<fstream>
#include<cstring>  
#include<iomanip>
#include<stdlib.h>
#include<windows.h>
using namespace std;
//学生类 
class Student
{
    public:
        void inputStudent(Student *head);      //输入学生的信息 
        void outputStudent(Student *head);    //输出学生的信息 
        void deleteStudent(Student *head);   //删除学生的信息
        void addStudent(Student *head);     //添加学生的信息
        void changeStudent(Student *head); //修改学生的信息 
        void findStudent(Student *head);  //查找学生的信息 
        void paixuStudent(Student *head);//学生成绩排序 
        void saveStudent(Student *head); //保存学生的信息
        void loadStudent(Student *head);//加载学生的信息 
        void getcountStudent(Student *head);
        
        int       num;
        char    name[20];
        char      sex[4];
        float     Chinese;
        float     English;
        float     Math;
        float     sum;
        float     average;
        Student *next;
        
        private:
            
};

void Student ::inputStudent(Student *head)//输入学生的信息 
{
    system("cls");
    Student *p1,*p2;
    
    p1=head;
    int N;
    cout<<"哈喽，小可爱，请输入学生的总人数"<<endl; 
    cin>>N;
    for(int i=0;i<N;i++)
    {
        p2= new Student ;
        p1->next=p2;
        p1=p1->next;
        cout<<"哈喽，小可爱，请输入学生的信息： "<<"学号 "<<"姓名 "<<"性别 " <<"语文 "<<"数学 "<<"英语 "<<endl; 
        cin>>p1->num>>p1->name>>p1->sex>>p1->Chinese>>p1->Math>>p1->English;
        p1->sum=p1->Chinese+p1->Math+p1->English;
        p1->average=(p1->sum)/3;
    }
    p1->next=NULL;
    cout<<"YES！输入成功"<<endl;
}

void Student ::outputStudent(Student *head)//浏览学生的信息 
{
    system("cls");
    Student *p1,*p2;

    p1=head->next;
    int r=0;//名次 
    cout<<"学号	"<<"姓名	"<<"性别	"<<"语文"
    <<"	"<<"数学"<<"	"<<"英语"<<"	"<<"	"<<"平均分"<<"	"<<"	"<<"总分"
    <<"	"<<"	"<<"排名"<<endl; 
    while(p1!=NULL)
    {
        cout<<p1->num<<"	"<<p1->name<<"	"<<p1->sex<<"	"<<p1->Chinese<<"	"<<p1->Math<<"	"<<p1->English<<"	"<<"	";
        cout<<p1->average<<"	"<<"	";    
        cout<<p1->sum<<"	"<<"	";
        cout<<r+1<<endl;
        r++;
        p1=p1->next;
    }
    cout<<"YES!浏览成功"<<endl;
    
 } 

void Student ::deleteStudent(Student *head)//删除学生的信息 
 {
     system("cls");
     
     Student *p1,*p2;
     char n;
     cout<<"哈喽，小可爱，请输入要删除的位置："<<endl;
     cin>>n;
     int a;
     a=n-'0';
     if(a>=0)
     {
         if(a>=0 && a<=count)
         {
             p1=head;
             p2=p1->next;
             while(--a)
             {
                 p1=p1->next;
                 p2=p2->next;
             }
             p1->next=p2->next;
      
              cout<<"YES!删除成功"<<endl; 
         }
         else
          {
            cout<<"输入错误，请输入0-"<<count<<"之间的数字位置：" ;
           } 
     }
     else
     {
         cout<<"输入错误，请输入0-"<<count<<"之间的数字位置：" ;
     } 
 }

 void Student ::addStudent(Student *head)//添加学生的信息 
 {
     system("cls");
     Student *p1,*p2;
     Student *p3;
     char n;
     cout<<"哈喽，小可爱，请输入要添加的位置 "<<endl;
    cin>>n;
    int a;
    a=n-'0';
    if(a>0)
    {
        if(a>=0 && a<=count)
        {
            p1=head;
            p2=p1->next;
        while(--a)
        {
            p2=p2->next;
            p1=p1->next;
         
        }
         p3=new Student;
         cout<<"哈喽，小可爱，请输入你的信息 ："<<endl<<"学号 "<<"姓名 "<<"性别 "<<"语文 "<<"数学 "<<"英语 "<<endl;
     
         cin>>p3->num>>p3->name>>p3->sex>>p3->Chinese>>p3->Math>>p3->English; 
         p3->sum=p3->Chinese+p3->Math+p3->English;
        p3->average=(p3->sum)/3;
         p3->next=p2;
         p1->next=p3;
         cout<<"YES!添加成功 "<<endl;
        }
        else
        {
            cout<<"输入错误，请输入0-"<<count<<"之间的数字位置：" ;
        }
  }
  else
  {
    cout<<"输入错误，请输入0-"<<count<<"之间的数字位置：" ;
  }
}

void Student::changeStudent(Student *head)//修改学生的信息 
  {
      system("cls");
      
      Student *p1,*p2;
      Student *p3;
  
      char n;
      cout<<"哈喽，小可爱，请选择你要修改的位置 ："<<endl;
      cin>>n;
      int a;
      a=n-'0';
      if(a>0)
      {
          if(a>=0 && a<=count)
          {
              p1=head;
              p2=p1->next;
              while(--a)
              {
                  p1=p1->next;
                  p2=p2->next ;
              }
              cout<<"哈喽，小可爱，请输入你的信息 ："<<endl<<"学号 "<<"姓名 "<<"性别 "<<"语文 "<<"数学 "<<"英语 "<<endl;
     
             cin>>p2->num>>p2->name>>p2->sex>>p2->Chinese>>p2->Math>>p2->English; 
             p2->sum=p2->Chinese+p2->Math+p2->English;
             p2->average=(p2->sum)/3;
             cout<<"YES!修改成功"<<endl;
        
        }
        else
        {
            cout<<"输入错误，请输入0-"<<count<<"之间的数字位置：" ;
        }
      }
      else
      {
          cout<<"输入错误，请输入0-"<<count<<"之间的数字位置：" ;
      }
      
      
  }

void Student::findStudent(Student *head)//查找学生的信息 
  {
      system("cls");
      Student *p1;
      int p;
      int i=0;
      int stunum;
      char stuname[5];
      p1=head->next;
      cout<<"请选择 1.按学号查找 2. 按姓名查找"<<endl; 
      cin>>p;
      if(p==1)
      {
          system("cls");
        cout<<"请输入要查找的学号 "<<endl;
        cin>>stunum;
        while(p1!=NULL)
        {
            if(stunum==p1->num)
            {
                cout<<"学号	"<<"姓名	"<<"性别	"<<"语文"
               <<"	"<<"数学"<<"	"<<"英语"<<"	"<<"	"<<"平均分"<<"	"<<"	"<<"总分"
                <<"	"<<"	"<<endl; 
                cout<<p1->num<<"	"<<p1->name<<"	"<<p1->sex<<"	"<<p1->Chinese<<"	"<<p1->Math<<"	"<<p1->English<<"	"<<"	";
                cout<<p1->average<<"	"<<"	";    
                 cout<<p1->sum<<"	"<<"	";               
            }
            p1=p1->next;
           }
        
         }else if(p==2)
       {
            system("cls");
        cout<<"请输入要查找的姓名 "<<endl;
        cin>>stuname;
        while(p1!=NULL)
        {
            if(strcmp(p1->name,stuname)==0)
            {
                    cout<<"学号	"<<"姓名	"<<"性别	"<<"语文"
               <<"	"<<"数学"<<"	"<<"英语"<<"	"<<"	"<<"平均分"<<"	"<<"	"<<"总分"
                <<"	"<<"	"<<endl; 
                cout<<p1->num<<"	"<<p1->name<<"	"<<p1->sex<<"	"<<p1->Chinese<<"	"<<p1->Math<<"	"<<p1->English<<"	"<<"	";
                cout<<p1->average<<"	"<<"	";    
                 cout<<p1->sum<<"	"<<"	";
            }
            p1=p1->next;
        }
    }else
    {
        cout<<"输入选项错误 "<<endl;
    }

  } 

void Student::paixuStudent(Student *head)//排序
{
    Student *p1;
    Student *p2;
    p1=head;
    int n=0;
    int a=0;
    char b[20];
    int i,j;
    while(p1->next)
    {
        p1=p1->next ;
        n++;
    }
    for(i=0;i<n-1;i++)
    {
        p2=head->next;
        p1=p2->next;
        for(j=0;j<n-i-1;j++)
        {
           if(p1->average >p2->average )
            {
                strcpy(b,p2->name);
                strcpy(p2->name ,p1->name );
                strcpy(p1->name,b);
                
                strcpy(b,p2->sex);
                strcpy(p2->sex ,p1->sex);
                strcpy(p1->sex,b);
        
                a=p2->num ;
                p2->num =p1->num ;
                p1->num =a;
                
                a=p2->Chinese;
                p2->Chinese=p1->Chinese;
                p1->Chinese=a;
                
                a=p2->Math ;
                p2->Math =p1->Math ;
                p1->Math =a;
                
                a=p2->English ;
                p2->English =p1->English ;
                p1->English =a;
                
                a=p2->average;    
                p2->average =p1->average ;
                p1->average =a;
                
                a=p2->sum ;
                p2->sum =p1->sum ;
                p1->sum =a;
            }
            p1=p1->next;
            p2=p2->next;
        }
    }
    cout<<"YES!排序成功 "<<endl;
}

void Student::saveStudent(Student *head) //保存学生的信息 
{
    Student *p;
    ofstream os;
    os.open("sco.txt");

    p=head->next ;
    while(p)
    {
       os<<p->num<<"	"<<p->name<<"	"<<p->sex<<"	"<<p->Chinese<<"	" <<p->Math<<"	" <<p->English <<"	"<<p->sum<<"	"<<p->average; 
        
        p=p->next;
        os<<endl;
    }

    cout<<"YES!保存成功 "<<endl; 
    os.close();
}

void Student:: loadStudent(Student *head)//加载学生的信息 
{
    Student *p,*p2;
    ifstream is;
    is.open("sco.txt");
    
    
    p2=head;
    
    while(1)
    {
        p=new Student;
           is>>p->num>>p->name>>p->sex>>p->Chinese 
           >>p->Math>>p->English >>p->sum>>p->average;
           if(is.fail() )//判断是否到文件结尾 
           {
               delete p; 
               p2->next =NULL;
               break;
           }
           
        p2->next =p;
        
        p2=p2->next;    
    }
    
    cout<<"YES!加载成功 "<<endl;

    is.close();
    
    
}

int count;
void Student::getcountStudent(Student *head)
{
    Student *p;
    count=0;
    p=head;
    while(p->next!=NULL)
    {
        count++;
        p=p->next;
    }
}
 
void welcome()
{
 cout<<"       ~~~    欢迎进入**学生成绩管理系统!   ~~~"<<endl;
 system("color 1");
}
void menu()
{
 cout<<"      ******************************************"<<endl;
 cout<<"      ~~~~~~~   学生成绩管理系统  ~~~~~~~"<<endl;
 cout<<"      ******************************************"<<endl;
 cout<<"      ******************************************"<<endl;
 cout<<"      ******************************************"<<endl;
 cout<<"              ~~哈喽，小可爱,请选择你要进行的操作**" <<endl;        
 cout<<"              ~~1.    输入学生的信息          ~~"<<endl;
 cout<<"              ~~2.    浏览学生的信息          ~~"<<endl;
 cout<<"              ~~3.    删除学生的信息   　     ~~"<<endl;
 cout<<"              ~~4.    添加学生的信息          ~~"<<endl;
 cout<<"              ~~5.    修改学生的信息          ~~"<<endl;
 cout<<"              ~~6.    查找学生的信息          ~~"<<endl;
 cout<<"              ~~7.    排序学生的成绩          ~~"<<endl;
 cout<<"              ~~8.    保存学生的信息          ~~"<<endl;
 cout<<"              ~~9.    加载学生的信息          ~~"<<endl;
 cout<<"              ~~0.    退出学生信息系统        ~~"<<endl; 
 cout<<"       *****************************************"<<endl;
 cout<<"       *****************************************"<<endl;
 cout<<"       *****************************************"<<endl;
 system("color b");
}

int main()
{
    Student h;
    system("cls"); 
    welcome();
    Sleep(1000);
    int i;
    Student *head=new Student;
    
    while(1)
    {
        system("cls");
        menu();
        cout<<"哈喽，小可爱，请输入你要进行的操作 ："<<endl;
        cin>>i; 
        switch(i)
        {
            case 1:  cout<<"输入学生的信息 "<<endl;h.inputStudent(head);system("pause");h.getcountStudent(head);break;
            case 2:  cout<<"浏览学生的信息 "<<endl;h.outputStudent(head);system("pause");h.getcountStudent(head);break;
            case 3:  cout<<"删除学生的信息 "<<endl;h.deleteStudent(head);system("pause");h.getcountStudent(head);break;
            case 4:  cout<<"添加学生的信息 "<<endl;h.addStudent(head);system("pause");h.getcountStudent(head);break;
            case 5:  cout<<"修改学生的信息 "<<endl;h.changeStudent(head);system("pause");h.getcountStudent(head);break;
            case 6:  cout<<"查询学生的信息 "<<endl;h.findStudent(head);system("pause");h.getcountStudent(head);break;
            case 7:  cout<<"学生成绩的排序 "<<endl;h.paixuStudent(head);system("pause");h.getcountStudent(head);break; 
            case 8:  cout<<"保存学生的信息 "<<endl;h.saveStudent(head);system("pause");h.getcountStudent(head);break;
            case 9:  cout<<"加载学生的信息 "<<endl;h.loadStudent(head);system("pause");h.getcountStudent(head);break;
            case 0:  cout<<"谢谢使用，欢迎下次光临 "<<endl;system("pause");exit(0);
             
            default: cout<<"输入错误"<<endl; 
        }
    }
    return 0;
}