学生成绩管理系统C++实现代码

* 程序头部的注释结束
*/

# include <iostream>
# include <fstream>
# include <string.h>
#include <conio.h>//用getch();
using namespace std;
 
//?k?k?k?k?k?k?k?k?k?kStudent类?k?k?k?k?k?k?k?k?k?k?k
class Student
{
public:
 char name[20];
 char Id[20];
 int Cnum;  //C++课程得分
 int Mnum;  //汇编课程得分
 int Enum;  //嵌入式操作系统课程得分
 int sum;  //总分  
 Student * Next;
 void Input()
 {
 cout<<"\t\t请输入学生的姓名："; cin>>name;
 cout<<"\t\t请输入学生的学号："; cin>>Id;
 cout<<"\t\t请输入C++课程的成绩："; cin>>Cnum;
 cout<<"\t\t请输入汇编课程的成绩："; cin>>Mnum;
 cout<<"\t\t请输入嵌入式操作系统课程的成绩："; cin>>Enum;
 sum=Cnum+Mnum+Enum;
 }
 void ReadFile(istream & in)
 {
 in>>name>>Id>>Cnum>>Mnum>>Enum>>sum;
 }
 void Show()
 {
 cout<<"姓名:"<<name<<endl<<"学号:"<<Id<<endl<<"C++:"<<Cnum<<endl
 <<"汇编:"<<Mnum<<endl<<"嵌入式操作系统："<<Enum<<endl<<"总成绩:"<<sum<<endl<<endl<<endl;
 }
};
 
//?k?k?k?k?k?k?k?k?kStudentmassage类?k?k?k?k?k?k?k?k?k?k?k?k
class Studentmassage
{
public:
 Studentmassage();
 ~Studentmassage();
 void ShowMenu();
 void Find();
 void Save();
 void ModifyItem();
 void RemoveItem();
 void Swap(Student *,Student *);
 void Sort();
 //void Unpass();
 int ListCount();
 //void Average();
 void Display()
 {
 for(Student * p=Head->Next;p!=End;p=p->Next)
 p->Show();
 cout<<"输入任意字符！继续……";
 getch();
 }
 void AddItem()
 {
 End->Input();
 End->Next=new Student;
 End=End->Next;
 cout<<"添加成功!"<<endl;
 cout<<"输入任意字符！继续……";
 getch();
 }
private:
 Student * Head,* End;
 ifstream in;
 ofstream out;
 Student *FindItem(char * name)
 {
 for(Student * p=Head;p->Next!=End;p=p->Next)//匹配成功则返回上一个指针，不成功就返回空
 if(!strcmp(p->Next->name,name))return p;
 return NULL;
 }
 Student *FindID(char * Id)
 {
 for(Student * p=Head;p->Next!=End;p=p->Next)//匹配成功则返回上一个指针，不成功就返回空
 if(!strcmp(p->Next->Id,Id))return p;
 return NULL;
 }
};
 
//?k?k?k?k?k?k?k?k?k?k?k?k构造函数?k?k?k?k?k?k?k?k?k?k?k?k
Studentmassage::Studentmassage()
{
 Head=new Student;
 Head->Next=new Student;
 End=Head->Next;
 in.open("sort.txt");
 if(!in)
 cout<<"这是一个新系统，无学生信息。请先输入。"<<endl;
 else
 {
 while(!in.eof())
 {
 End->ReadFile(in);
 if(End->name[0]=='\0')break;
 End->Next=new Student;
 End=End->Next;
 }
 in.close();
 cout<<"\t\t读取学生信息成功!"<<endl;
 }
}
 
//?k?k?k?k?k?k?k?k?k?k?k?k析构函数?k?k?k?k?k?k?k?k?k?k?k?k
Studentmassage::~Studentmassage()
{
 Save();
 for(Student * temp;Head->Next!=End;)
 {
 temp=Head->Next;
 Head->Next=Head->Next->Next;
 delete temp;
 }
 delete Head,End;
}
 
//?k?k?k?k?k?k?k?k?k?k?k?k菜单?k?k?k?k?k?k?k?k?k?k?k?k
void Studentmassage::ShowMenu()     
{
 cout<<"********************************************************************************"<<endl;
 cout<<"〓〓〓〓〓〓〓〓〓〓 ☆ 学 生 成 绩 管 理 系 统  ☆ 〓〓〓〓〓〓〓〓〓〓"<<endl;
 cout<<"〓〓〓〓〓〓〓★★★★★   ★★★★★★★   ★★★★★〓〓〓〓〓〓〓"<<endl;
 cout<<"〓〓〓〓〓〓〓〓〓★ ☆   1.增加学生成绩  ☆ ★〓〓〓〓〓〓〓〓〓"<<endl;
 cout<<"〓〓〓〓〓〓〓〓〓★ ☆   2.显示学生成绩  ☆ ★〓〓〓〓〓〓〓〓〓"<<endl;
 cout<<"〓〓〓〓〓〓〓〓〓★ ☆   3.排序统计成绩  ☆ ★〓〓〓〓〓〓〓〓〓"<<endl;
 cout<<"〓〓〓〓〓〓〓〓〓★ ☆   4.查找学生成绩  ☆ ★〓〓〓〓〓〓〓〓〓"<<endl;
 cout<<"〓〓〓〓〓〓〓〓〓★ ☆   5.删除学生成绩  ☆ ★〓〓〓〓〓〓〓〓〓"<<endl;
 cout<<"〓〓〓〓〓〓〓〓〓★ ☆   6.修改学生信息  ☆ ★〓〓〓〓〓〓〓〓〓"<<endl;
 cout<<"〓〓〓〓〓〓〓〓〓★ ☆   0.安全退出系统  ☆ ★〓〓〓〓〓〓〓〓〓"<<endl;
 
 cout<<"\n\t\t\n\t\t请选择：";
}
 
//?k?k?k?k?k?k?k?k?k?k?k?k查找函数?k?k?k?k?k?k?k?k?k?k?k?k
void Studentmassage::Find()
{
 char name[20] ,Id[10];
 int x;
 Student * p=NULL;
 cout<<"\n\t\t*********************************\n";
 cout<<"\t\t※ 1.按学生的姓名查找\n\t\t※ 2.按学生学号查找";
 cout<<"\n\t\t*********************************\n请选择：";
 cin>>x;
 switch(x)
 {
 case 1:{cout<<"\t\t请输入要查找的学生的姓名：";cin>>name;
 if(p=FindItem(name))
 {
 p->Next->Show();
 cout<<"输入任意字符！继续……";
 getch();
 }
 else
 {
 cout<<"\t\t没有找到该姓名的学生！"<<'\n'<<endl;
 cout<<"输入任意字符！继续……";
 getch();
 }
  }break;
 case 2:
 {
 cout<<"\t\t请输入要查找的学生的学号：";cin>>Id;
 if(p=FindID(Id))
 {
 p->Next->Show();
 cout<<"输入任意字符！继续……";
 getch();
 }
 else
 {
 cout<<"\t\t没有找到该学好的学生！"<<'\n'<<endl;
 cout<<"输入任意字符！继续……";
 getch();
 }
 }break;
 }
 
}
 
//?k?k?k?k?k?k?k?k?k?k?k?k修改信息?k?k?k?k?k?k?k?k?k?k?k?k
void Studentmassage::ModifyItem()  //修改信息
{
 char name[20];
 Student * p=NULL;
 cout<<"\t\t请输入要修改的人的姓名:";cin>>name;
 if(p=FindItem(name))
 {
 cout<<"\t\t已找到学生的信息，请输入新的信息!"<<endl;
 p->Next->Input();
 cout<<"修改成功！"<<endl;
 cout<<"输入任意字符！继续……";
 getch();
 }
 else
 {
 cout<<"\t\t没有找到!"<<endl;
 cout<<"输入任意字符！继续……";
 getch();
 }
}
 
//?k?k?k?k?k?k?k?k?k?k?k?k删除信息?k?k?k?k?k?k?k?k?k?k?k?k
void Studentmassage::RemoveItem()   // 删除信息
{
 char name[20];
 Student * p=NULL,*temp=NULL;
 cout<<"\t\t请输入要删除的学生的姓名:"<<endl;cin>>name;
 if(p=FindItem(name))
 {
 temp=p->Next;
 p->Next=p->Next->Next; 
 delete temp;
 cout<<"\t\t删除成功!"<<endl;
 cout<<"输入任意字符！继续……";
 getch();
 }
 else
 {
 cout<<"\t\t没有找到!"<<endl;
  cout<<"输入任意字符！继续……";
 getch();
 }
}
 
//?k?k?k?k?k?k?k?k?k?k?k?k?k?k?k?k?k?k?k?k?k?k?k?k
void Studentmassage::Swap(Student *p1, Student *p2)//交换两个combox变量的数据域
{
 Student *temp=new Student; 
 strcpy(temp->name,p1->name);
 strcpy(temp->Id,p1->Id);
 temp->Cnum=p1->Cnum;
 temp->Mnum=p1->Mnum;
 temp->Enum=p1->Enum;
 temp->sum=p1->sum;
 
 strcpy(p1->name,p2->name);
 strcpy(p1->Id,p2->Id);
 p1->Cnum=p2->Cnum;
 p1->Mnum=p2->Mnum;
 p1->Enum=p2->Enum;
 p1->sum=p2->sum;
 
 strcpy(p2->name,temp->name);
 strcpy(p2->Id,temp->Id);
 p2->Cnum=temp->Cnum;
 p2->Mnum=temp->Mnum;
 p2->Enum=temp->Enum;
 p2->sum=temp->sum;
}
 
//?k?k?k?k?k?k?k?k?k?k?k?k?k?k?k?k?k?k?k?k?k?k?k?k
int Studentmassage::ListCount()//统计当前链表的记录总数，返回一个整数
{
 if(! Head)
 return 0;
 int n=0;
 for(Student * p=Head->Next;p!=End;p=p->Next)
 {
 n++;
 }
 return n;
}
 
//?k?k?k?k?k?k?k?k?k?k?k?k?k?k?k?k?k?k?k?k?k?k?k?k
void Studentmassage::Sort()//对当前链表进行排序
{ 
 cout <<"Sorting..."<<endl;
 Student *p=NULL,*p1=NULL,*k=NULL;
 int n=Studentmassage::ListCount();
 if(n<2) 
 return;
 for(p=Head->Next;p!=End;p=p->Next)
 for(k=p->Next;k!=End;k=k->Next)
 {
 if(p->sum>k->sum)
 {
 Studentmassage::Swap(p,k);
 }
 }
 cout <<"排序完成！"<<endl;
 getch();
 return;
}
 
//?k?k?k?k?k?k?k?k?k?k?k保存函数?k?k?k?k?k?k?k?k?k?k?k?k?k
void Studentmassage::Save()
{
 out.open("sort.txt");
 for(Student *p=Head->Next;p!=End;p=p->Next)
 out<<p->name<<"\t"<<p->Id<<"\t"<<p->Cnum<<"\t"
 <<p->Mnum<<"\t"<<p->Enum<<"\t"<<p->sum<<'\n';
 out.close();
}
 
//?k?k?k?k?k?k?k?k?k?k?k?k主函数?k?k?k?k?k?k?k?k?k?k?k?k
int main()
{
 int x,i=0;
 bool quit=false;
 cout<<"\t\t§§§§§§§§§§§§§§§§§§§§§§§§§§"<<endl;
 for(i=0;i<3;i++)
 cout<<"\t\t◎\t\t\t\t\t\t ◎"<<endl;
 cout<<"\t\t◎★★★★【 欢迎进入学生成绩管理系统 】★★★★◎"<<endl;
 for(i=0;i<3;i++)
 cout<<"\t\t◎\t\t\t\t\t\t ◎"<<endl;
 cout<<"\t\t§§§§§§§§§§§§§§§§§§§§§§§§§§\n"<<endl;;
 Studentmassage Grade;
 cout<<"按任意键开始……";
 getch();
 while(!quit)
 {
 system("cls");
 Grade.ShowMenu();
 cin>>x;
 switch(x)
 {
 case 0:quit=true;break;
 case 1:Grade.AddItem();break;
 case 2:Grade.Display();break;
 case 3:Grade.Sort();break;
 case 4:Grade.Find();break;
 case 5:Grade.RemoveItem();break;
 case 6:Grade.ModifyItem();break;
 }
 }
 return 0;
}