C++实现简单的学生管理系统

//Student.cpp

#include<iostream> using namespace std; struct Stu { char no[10]; char name[16]; int math; int chi; double ave; }; class Student { public: Stu st; Student * next; public: Student(){} Student(Stu s) { st=s; next=NULL; st.ave=(st.math+st.chi)/2.0; } void setst(Stu s) { st=s; st.ave=(st.math+st.chi)/2.0; } Stu getst() { return st; } void show() { cout<<"----------------------------"<<endl; cout<<"学号:"<<st.no<<endl; cout<<"姓名:"<<st.name<<endl; cout<<"数学成绩:"<<st.math<<endl; cout<<"语文成绩:"<<st.chi<<endl; cout<<"平均成绩:"<<st.ave<<endl; cout<<"----------------------------"<<endl; } };

//main.cpp

#include<fstream> #include"Student.cpp" using namespace std; Student * create_List(); void traverse_List(Student * pHead); bool is_empty(Student * pHead); int length_List(Student * pHead); bool insert_List(Student * pHead,int position,Stu st); bool delete_List(Student * pHead,int position,Stu * st); void sort_List(Student * pHead); void menu_select(); void handle_menu(int s); void outFile(); Student * inFile(); void delFile(); Student * pHead; void main() { menu_select(); } void menu_select() { int s; cout<<"请输入您要操作的选项:"<<endl; cout<<"1.增加原始记录"<<endl; cout<<"2.按平均分排序显示所有记录"<<endl; cout<<"3.保存原始文件"<<endl; cout<<"4.读取原始文件"<<endl; cout<<"5.删除原始文件"<<endl; cout<<"6.插入单条记录"<<endl; cout<<"7.删除单条记录"<<endl; cout<<"8.显示记录总条数"<<endl; cout<<"9.结束程序运行"<<endl<<endl; cout<<"左边数字对应功能选择,请选择1-9:"; cin>>s; handle_menu(s); } void handle_menu(int s) { switch (s) { case 1: { system("cls"); pHead=create_List(); system("cls"); menu_select(); break; } case 2: { if(NULL==pHead) { cout<<"记录总条数为零"<<endl; getchar(); getchar(); system("cls"); menu_select(); } system("cls"); sort_List(pHead); traverse_List(pHead); getchar(); getchar(); system("cls"); menu_select(); break; } case 3: { if(pHead!=NULL) { system("cls"); outFile(); system("cls"); menu_select(); } system("cls"); menu_select(); break; } case 4: { system("cls"); pHead=inFile(); system("cls"); menu_select(); break; } case 5: { system("cls"); delFile(); system("cls"); menu_select(); break; } case 6: { if(NULL==pHead) { cout<<"记录总条数为零"<<endl; getchar(); getchar(); system("cls"); menu_select(); } system("cls"); int num; Stu st; traverse_List(pHead); cout<<"您想在哪条记录后插入,请输入序号:"; cin>>num; cout<<"编辑要插入的记录:"<<endl; cout<<"学号:"; cin>>st.no; cout<<"姓名:"; cin>>st.name; cout<<"数学成绩:"; cin>>st.math; cout<<"语文成绩:"; cin>>st.chi; if(insert_List(pHead,num-1,st)) { cout<<"插入成功!"<<endl; } else { cout<<"插入失败!"<<endl; } getchar(); getchar(); system("cls"); menu_select(); break; } case 7: { if(NULL==pHead) { cout<<"记录总条数为零"<<endl; getchar(); getchar(); system("cls"); menu_select(); } int num; Stu * st=(Stu *)malloc(sizeof(Stu)); traverse_List(pHead); cout<<endl<<"请输入您要删除的记录的序号:"; cin>>num; if(delete_List(pHead,num,st)) { cout<<endl<<"成功删除的记录如下:"<<endl; cout<<"学号:"<<st->no<<endl<<"姓名:"<<st->name<<endl; } else { cout<<"删除失败!"<<endl; } getchar(); getchar(); system("cls"); menu_select(); break; } case 8: { if(NULL!=pHead) { system("cls"); cout<<"记录总条数:"<<length_List(pHead)<<"条"<<endl; getchar(); getchar(); system("cls"); menu_select(); } else { cout<<"记录总条数为零"<<endl; getchar(); getchar(); system("cls"); menu_select(); } break; } case 9: { system("cls"); cout<<"成功退出!"<<endl; exit(0); break; } } } void delFile() { ofstream fileout; fileout.open("c:kcsj.txt",ios_base::out); fileout<<""; fileout.close(); } Student * inFile() { Student * pHead=(Student *)malloc(sizeof(Student)); if(NULL==pHead) { cout<<"分配失败,程序终止!"<<endl; exit(0); } Student * pTail=pHead; pTail->next=NULL; ifstream in("c:kcsj.txt"); if (!in.is_open()) { cout << "Error opening file"<<endl; exit(0); } while (!in.eof()) { Stu st; in.read(reinterpret_cast<char *>(&st), sizeof(st)); if (in.fail()) { break; } Student * pNew=new Student(); if(NULL==pNew) { printf("分配失败,程序终止n"); exit(0); } pNew->setst(st); pTail->next=pNew; pNew->next=NULL; pTail=pNew; } in.close(); return pHead; } void outFile() { ofstream out; out.open("c:kcsj.txt",ios_base::out|ios_base::app|ios::binary); if(!out) { cout<<"文件不存在，退出时别忘记保存文件!"<<endl; out.close(); out.open("stu.dat",ios_base::out|ios::binary); } else { out.close(); out.open("c:kcsj.txt",ios_base::out|ios_base::app|ios::binary); } Student * temp=pHead->next; while(temp!=NULL) { Stu st=temp->getst(); out.write(reinterpret_cast<char *>(&st), sizeof(st)); temp=temp->next; } out.close(); } Student * create_List() { int len; Student * pHead=(Student *)malloc(sizeof(Student)); if(NULL==pHead) { cout<<"分配失败,程序终止!"<<endl; exit(0); } Student * pTail=pHead; pTail->next=NULL; cout<<"请输入要存储的学生人数:"; cin>>len; for(int i=0;i<len;i++) { Stu st; cout<<"请输入第"<<i+1<<"个学生的学号:"; cin>>st.no; cout<<"请输入第"<<i+1<<"个学生的姓名:"; cin>>st.name; cout<<"请输入第"<<i+1<<"个学生的数学成绩:"; cin>>st.math; cout<<"请输入第"<<i+1<<"个学生的语文成绩:"; cin>>st.chi; Student * pNew=new Student(); if(NULL==pNew) { printf("分配失败,程序终止n"); exit(0); } pNew->setst(st); pTail->next=pNew; pNew->next=NULL; pTail=pNew; } return pHead; } void traverse_List(Student * pHead) { int i=1; Student * temp=pHead->next; while(temp!=NULL) { cout<<endl<<"序号:"<<i<<endl; temp->show(); temp=temp->next; i++; } } bool is_empty(Student * pHead) { if(NULL==pHead->next) { return true; } else { return false; } } int length_List(Student * pHead) { int len=0; Student * temp=pHead->next; while(temp) { len++; temp=temp->next; } return len; } bool insert_List(Student * pHead,int position,Stu st) { int i=0; Student * p=pHead; while(NULL!=p&&i<position-1) { p=p->next; i++; } if(i>position-i||NULL==p) { return false; } Student * pNew=(Student *)malloc(sizeof(Student)); if(NULL==pNew) { cout<<"分配失败,程序终止"<<endl; exit(0); } pNew->setst(st); pNew->next=p->next; p->next=pNew; return true; } bool delete_List(Student * pHead,int position,Stu * st) { int i=0; Student * p=pHead; while(NULL!=p->next&&i<position-1) { p=p->next; i++; } Student * q=p->next; *st=q->getst(); p->next=p->next->next; free(q); q=NULL; return true; } void sort_List(Student * pHead) { Student * p,* q; Stu temp; int i,j; int len=length_List(pHead); for(i=0,p=pHead->next;i<len-1;i++,p=p->next) { for(j=i+1,q=p->next;j<len;j++,q=q->next) { if(q->st.ave>p->st.ave) { temp=q->st; q->st=p->st; p->st=temp; } } } }

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