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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