C++實(shí)現(xiàn)簡單的學(xué)生管理系統(tǒng)
//Student.cpp
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#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<<"學(xué)號:"<<st.no<<endl; cout<<"姓名:"<<st.name<<endl; cout<<"數(shù)學(xué)成績:"<<st.math<<endl; cout<<"語文成績:"<<st.chi<<endl; cout<<"平均成績:"<<st.ave<<endl; cout<<"----------------------------"<<endl; }}; |
//main.cpp
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#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<<"請輸入您要操作的選項(xiàng):"<<endl; cout<<"1.增加原始記錄"<<endl; cout<<"2.按平均分排序顯示所有記錄"<<endl; cout<<"3.保存原始文件"<<endl; cout<<"4.讀取原始文件"<<endl; cout<<"5.刪除原始文件"<<endl; cout<<"6.插入單條記錄"<<endl; cout<<"7.刪除單條記錄"<<endl; cout<<"8.顯示記錄總條數(shù)"<<endl; cout<<"9.結(jié)束程序運(yùn)行"<<endl<<endl; cout<<"左邊數(shù)字對應(yīng)功能選擇,請選擇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<<"記錄總條數(shù)為零"<<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<<"記錄總條數(shù)為零"<<endl; getchar(); getchar(); system("cls"); menu_select(); } system("cls"); int num; Stu st; traverse_List(pHead); cout<<"您想在哪條記錄后插入,請輸入序號:"; cin>>num; cout<<"編輯要插入的記錄:"<<endl; cout<<"學(xué)號:"; cin>>st.no; cout<<"姓名:"; cin>>st.name; cout<<"數(shù)學(xué)成績:"; cin>>st.math; cout<<"語文成績:"; cin>>st.chi; if(insert_List(pHead,num-1,st)) { cout<<"插入成功!"<<endl; } else { cout<<"插入失敗!"<<endl; } getchar(); getchar(); system("cls"); menu_select(); break; } case 7: { if(NULL==pHead) { cout<<"記錄總條數(shù)為零"<<endl; getchar(); getchar(); system("cls"); menu_select(); } int num; Stu * st=(Stu *)malloc(sizeof(Stu)); traverse_List(pHead); cout<<endl<<"請輸入您要?jiǎng)h除的記錄的序號:"; cin>>num; if(delete_List(pHead,num,st)) { cout<<endl<<"成功刪除的記錄如下:"<<endl; cout<<"學(xué)號:"<<st->no<<endl<<"姓名:"<<st->name<<endl; } else { cout<<"刪除失敗!"<<endl; } getchar(); getchar(); system("cls"); menu_select(); break; } case 8: { if(NULL!=pHead) { system("cls"); cout<<"記錄總條數(shù):"<<length_List(pHead)<<"條"<<endl; getchar(); getchar(); system("cls"); menu_select(); } else { cout<<"記錄總條數(shù)為零"<<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<<"分配失敗,程序終止!"<<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("分配失敗,程序終止\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，退出時(shí)別忘記保存文件!"<<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<<"分配失敗,程序終止!"<<endl; exit(0); } Student * pTail=pHead; pTail->next=NULL; cout<<"請輸入要存儲(chǔ)的學(xué)生人數(shù):"; cin>>len; for(int i=0;i<len;i++) { Stu st; cout<<"請輸入第"<<i+1<<"個(gè)學(xué)生的學(xué)號:"; cin>>st.no; cout<<"請輸入第"<<i+1<<"個(gè)學(xué)生的姓名:"; cin>>st.name; cout<<"請輸入第"<<i+1<<"個(gè)學(xué)生的數(shù)學(xué)成績:"; cin>>st.math; cout<<"請輸入第"<<i+1<<"個(gè)學(xué)生的語文成績:"; cin>>st.chi; Student * pNew=new Student(); if(NULL==pNew) { printf("分配失敗,程序終止\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<<"序號:"<<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<<"分配失敗,程序終止"<<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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