/*  Name: 顺序表实现学生成绩管理系统   Description: 完成对学生成绩的建立,查找,插入,修改,删除等功能 *///======================================顺序表-学生成绩管理系统=================================== #include
    
     #include
     
      using namespace std;//======================================Student类的成员变量和成员函数=============================class Student{      public:             void Creat(Student stu[]);             void Insert(Student stu[]);             void Delete(Student stu[]);             void Lookup(Student stu[]);             void Update(Student stu[]);             void Stat(Student stu[]);             int Length(Student stu[]);             void Print(Student stu[]);                           Student();                   private:              string name;//姓名              long num;//学号              float score;//成绩              };//=====================================Student类的构造函数.舒适化元素数据===========================Student::Student(){                  name = '?';                  num = 0;                  score = 0;}//=====================================创建学生成绩信息的线性表(数组)================================void Student::Creat(Student stu[]){     cout << "请输入学生人数:";     int n;     cin >> n;     cout << "姓名" << '\t' << "学号" << '\t' << "成绩" << endl;     for(int i = 1;i <= n;i++)     {             string newname;             long newnum;             float newscore;                          cin >> newname;             stu[i].name = newname;             cin >> newnum;             stu[i].num = newnum;             cin >> newscore;             stu[i].score = newscore;     }} //======================================输出线性表中所有的学生信息====================================void Student::Print(Student stu[]){     cout<< "姓名" << '\t' << "学号" << '\t' << "成绩" << endl;     int i = 1;     while(stu[i].num)     {                      cout << stu[i].name << '\t' <
      
       << '\t' <
       
        << endl;                      i++;     }     cout << '\n';}//======================================在线性表的某个位置上插入学生信息===============================void Student::Insert(Student stu[]){     if(Student::Length(stu) == 100)     {                             cout << "存储空间已满,不能进行插入操作!" << '\n';     }     else     {         cout << "请输入要插入的位置:";         int m;         cin >> m;         int n = Student::Length(stu);         if(m > n + 1)         {              cout << "插入位置不正确,请重新输入!" << '\n';              Student::Insert(stu);         }         else         {             for(int i = n;i >= m;i --)             {                     stu[i + 1].name = stu[i].name;                     stu[i + 1].num = stu[i].num;                     stu[i + 1].score = stu[i].score;             }             cout << "请依次输入姓名,学号,成绩" << '\n';                          string newname;             long newnum;             float newscore;                          cin >> newname;             stu[m].name = newname;             cin >> newnum;             stu[m].num = newnum;             cin >> newscore;             stu[m].score = newscore;         }             }}//======================================根据学号删除线性表中对应的学生信息=============================== void Student::Delete(Student stu[]){     cout << "请输入你要删除的学号:";     long num;     cin >> num;     int i = 1;     if(!stu[i].num)     {                    cout << "你要删除的学号不存在,请重新输入!"<< '\n';                    Student::Delete(stu);//重新进行删除操作      }     while(stu[i].num)     {                      if(stu[i].num == num)                      {                                    int n = Student::Length(stu);                                    for(int j = i;j < n;j++)//数组中数据依次前移                                     {                                            stu[j].name = stu[j + 1].name;                                            stu[j].num = stu[i + 1].num;                                            stu[i].score = stu[i + 1].score;                                    }                                    stu[n].name = '?';                                    stu[n].num = 0;                                    stu[n].score = 0;                                    break;                      }                      i++;     }}//======================================根据学号查询线性表中某个学生成绩信息=============================void Student::Lookup(Student stu[]){     cout << "请输入你要查询的学号:";     long num;     cin >> num;     int i = 1;     while(stu[i].num)     {                      if(stu[i].num == num)                      {                                    cout << "姓名" << '\t' << "学号" << '\t' << "成绩" << '\n';                                    cout << stu[i].name << '\t' <
        
         << '\t' <
         
          <<'\n'; break; } i++; } if(!stu[i].num) { cout << "你要查询的学号不存在,请重新输入!" << '\n'; Student::Lookup(stu); } cout << '\n';}//======================================修改线性表中某个位置的学生信息====================================void Student::Update(Student stu[]){ cout << "请输入你要修改的位置:"; int m; cin >> m; if(m > Student::Length(stu)) { cout << "你要修改的位置不存在,请重新输入!" << '\n'; Student::Update(stu); } else { cout << "请依次输入更改后的姓名,学号,成绩" << '\n'; string newname; long newnum; float newscore; cin >> newname; stu[m].name = newname; cin >> newnum; stu[m].num = newnum; cin >> newscore; stu[m].score = newscore; }}//=======================================查询线性表中有效数据的长度========================================int Student::Length(Student stu[]){ int i = 1; while(stu[i].num) { i++; } return (i - 1);}//=======================================统计各成绩段的学生信息=============================================void Student::Stat(Student stu[]){ cout << "不及格的学生是:" << '\n'; cout << "姓名" << '\t' << "学号" << '\t' << "成绩" <<'\n'; int i = 1; while(stu[i].num) { if(stu[i].score < 60) { cout << stu[i].name << '\t' <
          
           << '\t' << stu[i].score << '\n'; } i++; } cout << '\n'; cout << "成绩为\"中\"的学生是:" << '\n'; cout << "姓名" << '\t' << "学号" << '\t' << "成绩" <<'\n'; i = 1; while(stu[i].num) { if(stu[i].score >= 60 && stu[i].score < 75) { cout << stu[i].name << '\t' <
           
            << '\t' << stu[i].score << '\n'; } i++; } cout << '\n'; cout << "成绩为\"良\"的学生是:" << '\n'; cout << "姓名" << '\t' << "学号" << '\t' << "成绩" <<'\n'; i = 1; while(stu[i].num) { if(stu[i].score >= 75 && stu[i].score < 90) { cout << stu[i].name << '\t' <
            
             << '\t' << stu[i].score << '\n'; } i++; } cout << '\n'; cout << "成绩为\"优\"的学生是:" << '\n'; cout << "姓名" << '\t' << "学号" << '\t' << "成绩" <<'\n'; i = 1; while(stu[i].num) { if(stu[i].score >= 90) { cout << stu[i].name << '\t' <
             
              << '\t' << stu[i].score << '\n'; } i++; } cout << '\n';}//====================================================界面====================================================== void Menu(){ cout << "=============================请选择相应的功能============================" <
              
               <
               
                > j; switch(j) { case 1: { stu[0].Insert(stu); stu[0].Print(stu); break; } case 2: { stu[0].Delete(stu); stu[0].Print(stu); break; } case 3: { stu[0].Lookup(stu); break; } case 4: { stu[0].Update(stu); stu[0].Print(stu); break; } case 5: { stu[0].Stat(stu); break; } default: break; } } cout << "线性表中共有:" << stu[0].Length(stu) << " 个学生"; system("pause"); return 0;}