C++购书系统问题测试＆功能补充
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代码来源：舍友大一的C++作业
【代码存在的问题】
在菜单界面选择对应序号时，若输入值非数字，而是字母等其它符号，会导致程序陷入循环，无法正常进入功能的下一步
原代码展示：
int main() system("color 8E"); int k,i,choose,orderflag=1; double t_sum; book* head = new book; trolley* head2 = new trolley; layfolk* l_head = new layfolk; member* m_head = new member; honoured_guest* h_head = new honoured_guest; historyorder* o_head = new historyorder; head->Loaddata(head); l_head->loaddata(l_head); m_head->loaddata(m_head); h_head->loaddata(h_head); string ch; while (1) system("color 8E"); system("cls"); printf("\\n\\n\\n"); printf("\\t\\t\\t\\t+-----------TouhouBookStore-----------+\\n"); printf("\\t\\t\\t\\t|--------------东方铃奈庵-------------|\\n"); printf("\\t\\t\\t\\t+-------------网上购书系统------------+\\n"); printf("\\t\\t\\t\\t+-------------------------------------+\\n"); printf("\\t\\t\\t\\t|\\t1 查看历史订单\\t\\t |\\n"); printf("\\t\\t\\t\\t|\\t2 查看个人会员信息\\t |\\n"); printf("\\t\\t\\t\\t|\\t3 查看店内书籍\\t\\t |\\n"); printf("\\t\\t\\t\\t|\\t4 搜索店内书籍\\t\\t |\\n"); printf("\\t\\t\\t\\t|\\t5 购买书籍\\t\\t |\\n"); printf("\\t\\t\\t\\t|\\t6 结算\\t\\t\\t |\\n"); printf("\\t\\t\\t\\t|\\t7 退出\\t\\t\\t |\\n"); printf("\\t\\t\\t\\t+-------------------------------------+\\n"); printf("\\n\\n\\n"); printf("\\t\\t\\t\\t请输入你想实现的功能前的代号：\\n"); printf("\\t\\t\\t\\t"); cin >> k; switch(k) case 1: cout<<"您的身份是："<<endl; cout<<"1)会员\\t2)贵宾\\t3)普通顾客"<<endl; cin>>choose; switch(choose) case 1: o_head->m_display(head2,m_head);break; case 2: o_head->h_display(head2,h_head);break; case 3: o_head->l_display(head2,l_head);break; default:break; break; case 2: system("cls"); cout<<"\\n请选择您的会员身份：\\n"<<endl; cout<<"1.我是会员\\t2.我是贵宾\\t3.我是普通顾客\\n\\n"; cout<<"请输入对应的身份序号："; cin>>k; while(!k) cin.clear(); cin.sync(); k=-1; break; system("cls"); if(k==1) m_head->find(m_head);system("pause"); else if(k==2) h_head->find(h_head);system("pause"); else if(k==3) l_head->find(l_head);system("pause"); else cout<<"请输入正确的序号！"<<endl;system("pause"); break; case 3: system("cls");head->display(head);system("pause");break; case 4: cout<<"请选择搜索方式："<<"\\n\\n"; cout<<"1.按照书名搜索\\t2.按照作者名字搜索\\t3.按关键字搜索"<<"\\n\\n"; cout<<"请输入你想要选择的方式序号："; cin>>k; while(!k) cin.clear(); cin.sync(); k=-1; break; system("cls"); if(k==1) head->find_name(head);system("pause"); else if(k==2) head->find_author(head);system("pause"); else if(k==3) head->find_critical(head);system("pause"); else cout<<"请输入正确的序号！"<<endl;system("pause"); break; case 5: head2->Addbook(head2,head);system("pause");break; case 6: t_sum=head2->count(head2); if(t_sum==-1) system("pause"); break; cout<<"您的身份是："<<endl; cout<<"1)会员\\t2)贵宾\\t3)普通顾客"<<endl; cin>>choose; switch(choose) case 1: orderflag=o_head->m_storage(head2,m_head,t_sum); if(orderflag!=-1) cout<<"请进行下一步支付步骤"<<"\\n\\n"; system("pause"); head2->pay(); head2->remake(head2); break; case 2: orderflag=o_head->h_storage(head2,h_head,t_sum); if(orderflag!=-1) cout<<"请进行下一步支付步骤"<<"\\n\\n"; system("pause"); head2->pay(); head2->remake(head2); break; case 3: orderflag=o_head->l_storage(head2,l_head,t_sum); if(orderflag!=-1) cout<<"请进行下一步支付步骤"<<"\\n\\n"; system("pause"); head2->pay(); head2->remake(head2); break; default:break; break; case 7: head->Savedata(head);return 0; case 8: head->Addbook(head);break; case 9: system("cls"); cout<<"\\n请选择要进行添加的顾客信息：\\n\\n"; cout<<"1.添加新会员\\t2.添加新贵宾\\t3.添加普通顾客信息\\n\\n"; cout<<"请输入对应序号："; cin>>k; while(!k) cin.clear(); cin.sync(); k=-1; break; system("cls"); if(k==1) m_head->addm(m_head);m_head->savedata(m_head);system("pause"); else if(k==2) h_head->addh(h_head);h_head->savedata(h_head);system("pause"); else if(k==3) l_head->addl(l_head);l_head->savedata(l_head);system("pause"); else cout<<"请输入正确的序号！"<<endl;system("pause"); break; default: cout<<"请输入正确序号！"<<endl; system("pause"); break; return 0;
【问题产生的原因】
由于接收数值的变量k为int类型，在接收字母或其它字符等char类型时，导致程序出现问题
【解决方案】
应用cin.clear()更改cin的异常状态标识，再用cin.sync()函数对缓冲区中的数据流进行清理，然后给变量k赋值为-1，进入switch选择后将跳转至default一列，随后结束此次循环。后续代码运行将恢复正常。
//将这几行代码嵌入至给变量k赋值的 cin>>k; 之后即可
while(!k) cin.clear(); cin.sync(); k=-1; break;
【修改后的代码】
int main() system("color 8E"); int k,i,choose,orderflag=1; double t_sum; book* head = new book; trolley* head2 = new trolley; layfolk* l_head = new layfolk; member* m_head = new member; honoured_guest* h_head = new honoured_guest; historyorder* o_head = new historyorder; head->Loaddata(head); l_head->loaddata(l_head); m_head->loaddata(m_head); h_head->loaddata(h_head); string ch; while (1) system("color 8E"); system("cls"); printf("\\n\\n\\n"); printf("\\t\\t\\t\\t+-----------TouhouBookStore-----------+\\n"); printf("\\t\\t\\t\\t|--------------东方铃奈庵-------------|\\n"); printf("\\t\\t\\t\\t+-------------网上购书系统------------+\\n"); printf("\\t\\t\\t\\t+-------------------------------------+\\n"); printf("\\t\\t\\t\\t|\\t1 查看历史订单\\t\\t |\\n"); printf("\\t\\t\\t\\t|\\t2 查看个人会员信息\\t |\\n"); printf("\\t\\t\\t\\t|\\t3 查看店内书籍\\t\\t |\\n"); printf("\\t\\t\\t\\t|\\t4 搜索店内书籍\\t\\t |\\n"); printf("\\t\\t\\t\\t|\\t5 购买书籍\\t\\t |\\n"); printf("\\t\\t\\t\\t|\\t6 结算\\t\\t\\t |\\n"); printf("\\t\\t\\t\\t|\\t7 退出\\t\\t\\t |\\n"); printf("\\t\\t\\t\\t+-------------------------------------+\\n"); printf("\\n\\n\\n"); printf("\\t\\t\\t\\t请输入你想实现的功能前的代号：\\n"); printf("\\t\\t\\t\\t"); cin >> k;
while(!k)
cin.clear();
cin.sync();
k=-1; break;
switch(k) case 1: cout<<"您的身份是："<<endl; cout<<"1)会员\\t2)贵宾\\t3)普通顾客"<<endl; cin>>choose; switch(choose) case 1: o_head->m_display(head2,m_head);break; case 2: o_head->h_display(head2,h_head);break; case 3: o_head->l_display(head2,l_head);break; default:break; break; case 2: system("cls"); cout<<"\\n请选择您的会员身份：\\n"<<endl; cout<<"1.我是会员\\t2.我是贵宾\\t3.我是普通顾客\\n\\n"; cout<<"请输入对应的身份序号："; cin>>k; while(!k) cin.clear(); cin.sync(); k=-1; break; system("cls"); if(k==1) m_head->find(m_head);system("pause"); else if(k==2) h_head->find(h_head);system("pause"); else if(k==3) l_head->find(l_head);system("pause"); else cout<<"请输入正确的序号！"<<endl;system("pause"); break; case 3: system("cls");head->display(head);system("pause");break; case 4: cout<<"请选择搜索方式："<<"\\n\\n"; cout<<"1.按照书名搜索\\t2.按照作者名字搜索\\t3.按关键字搜索"<<"\\n\\n"; cout<<"请输入你想要选择的方式序号："; cin>>k; while(!k) cin.clear(); cin.sync(); k=-1; break; system("cls"); if(k==1) head->find_name(head);system("pause"); else if(k==2) head->find_author(head);system("pause"); else if(k==3) head->find_critical(head);system("pause"); else cout<<"请输入正确的序号！"<<endl;system("pause"); break; case 5: head2->Addbook(head2,head);system("pause");break; case 6: t_sum=head2->count(head2); if(t_sum==-1) system("pause"); break; cout<<"您的身份是："<<endl; cout<<"1)会员\\t2)贵宾\\t3)普通顾客"<<endl; cin>>choose; switch(choose) case 1: orderflag=o_head->m_storage(head2,m_head,t_sum); if(orderflag!=-1) cout<<"请进行下一步支付步骤"<<"\\n\\n"; system("pause"); head2->pay(); head2->remake(head2); break; case 2: orderflag=o_head->h_storage(head2,h_head,t_sum); if(orderflag!=-1) cout<<"请进行下一步支付步骤"<<"\\n\\n"; system("pause"); head2->pay(); head2->remake(head2); break; case 3: orderflag=o_head->l_storage(head2,l_head,t_sum); if(orderflag!=-1) cout<<"请进行下一步支付步骤"<<"\\n\\n"; system("pause"); head2->pay(); head2->remake(head2); break; default:break; break; case 7: head->Savedata(head);return 0; case 8: head->Addbook(head);break; case 9: system("cls"); cout<<"\\n请选择要进行添加的顾客信息：\\n\\n"; cout<<"1.添加新会员\\t2.添加新贵宾\\t3.添加普通顾客信息\\n\\n"; cout<<"请输入对应序号："; cin>>k; while(!k) cin.clear(); cin.sync(); k=-1; break; system("cls"); if(k==1) m_head->addm(m_head);m_head->savedata(m_head);system("pause"); else if(k==2) h_head->addh(h_head);h_head->savedata(h_head);system("pause"); else if(k==3) l_head->addl(l_head);l_head->savedata(l_head);system("pause"); else cout<<"请输入正确的序号！"<<endl;system("pause"); break; default: cout<<"请输入正确序号！"<<endl; system("pause"); break; return 0;
【二次开发所添加的功能】
在功能5购买书籍中，用户在使用的过程体验并不佳，因为无法直观看到自己已经选中了哪些书籍，故在此添加一个“购物车”形式的展示功能
【代码实现】
void trolley::display(trolley* t) if (t->next == NULL) cout << "目前购物车内无信息！\\t\\t" << endl; cout << "—————————————————————————————————————————————————————————\\n"; else cout << "\\n您的购物车中目前有以下书籍：" << endl; cout << "—————————————————————————————————————————————————————————\\n"; t = t->next; int n = 1; while (1) cout << "NO." << n << ":" << \'\\t\' << endl; cout << "—————————————————————————————————————————————————————————\\n"; cout << "书号：" << t->book_ID << \'\\t\'; cout << "书名：《" << t->book_name << "》" << \'\\t\'; cout << "作者：" << t->author << \'\\t\'; cout << "出版社：" << t->publishing << \'\\t\'; cout << "定价：" << t->price << \'\\t\'; cout << "购买份数:" << t->num << endl; cout << "—————————————————————————————————————————————————————————\\n"; if (t->next == NULL) break; else t = t->next; n++; void trolley::Addbook(trolley* t, book* m) trolley* hd = t; book* hd2 = m; trolley* p; trolley* p1; string t_name, ch; int n=0, flag = 0; while (1) system("cls"); flag = 0; t->display(hd); cout << "\\n是否继续添加书籍？\\n"; cout << "Y)继续添加\\tN）返回主菜单\\tD)删除订单" << endl; cin >> ch; if (ch == "Y" || ch == "y"); else if (ch == "N" || ch == "n")return; else if (ch == "D" || ch == "d") hd->Delete_t(hd); system("pause"); continue; else cout << "请输入正确指令" << endl; system("pause"); continue; while (t->next != NULL) t = t->next; p = new trolley; t->next = p; p->next = NULL; cout << "请输入想购买的书名：" << endl; cin >> t_name; m = hd2; while (1) if (m->book_name == t_name) ++n; cout << "NO." << n << ":" << \'\\t\' << endl; cout << "—————————————————————————————————————————————————————————\\n"; cout << "书号：" << m->book_ID << \'\\t\'; cout << "书名：《" << m->book_name << "》" << \'\\t\'; cout << "作者：" << m->author << \'\\t\'; cout << "出版社：" << m->publishing << \'\\t\'; cout << "定价：" << m->price << \'\\n\'; cout << "—————————————————————————————————————————————————————————\\n\\n"; cout << "请问是否确认购买该书籍？" << "\\n\\n"; cout << "1)Y\\t2)N" << "\\n\\n"; cin >> ch; if (ch == "N" || ch == "n") t->next = t->next->next; if (ch == "Y" || ch == "y") cout << "请输入您想要购买的份数："; cin >> n; p1 = hd; while (p1 != t) if (p1->next->book_name == t_name) p1->next->num += n; t->next = t->next->next; flag = 1; break; p1 = p1->next; if (flag == 1)break; p->book_ID = m->book_ID; p->book_name = t_name; p->author = m->author; p->publishing = m->publishing; p->price = m->price; p->num = n; t = p; if (m->next == NULL && n == 0) cout << "没有名为《" << t_name << "》的书籍" << endl; break; if (m->next == NULL) break; m = m->next; cout << "是否继续购买？" << endl; cout << "Y)继续购买\\tN）返回主菜单" << endl; cin >> ch; if (ch == "Y" || ch == "y"); if (ch == "N" || ch == "n")break;
如此一来，用户便能够清楚地看到自己所购买的书籍内容了
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