关于基于Win32开发的模拟航空订票系统的有关问题

关于基于Win32开发的模拟航空订票系统的问题
系统要求：
程序显示下列菜单选项：
Please   type   1   for   “smoking”
Please   type   2   for   “nonsmoking”
如果输入1，则程序指定吸烟舱位（座位1到5），如果输入2，则程序指定非吸烟舱位（座位6到10）。程序应输出一个登机牌，表示座位号和是否为吸烟舱位。程序不能再订已经订过的座位。吸烟舱位已满时，应该询问可否订非吸烟舱位；同样，非吸烟舱位已满时，应询问可否订吸烟舱位。如果同意，再相应订座，否则打印消息：“Next   flight   leaves   in   3   hours”。

我的代码：
#include   <string>
#include   <iostream>
using   namespace   std;

int   a[9]   =   {0};
int   smoking_booked   =   0;
int   nonsmoking_booked   =   0;
void   smoking_book();
void   nonsmoking_book();

void   main(){

void   system();
system();
}

void   system(){

int   choice;
cout   < <   "Welcome   for   using   Universal   Airline   Ticket   Booking   System!\n "
  < <   "Please   type   0   to   exit   the   system.\n "
  < <   "Please   type   1   for   \ "smoking\ ".\n "
  < <   "Please   type   2   for   \ "nonsmoking\ ". "   < <   endl;
cin   > >   choice;
if   (choice   ==   0)   cout   < <   "Thank   you   for   using,   goodbye! "   < <   endl;
else   if   (choice   ==   1)   smoking_book();
else   if   (choice   ==   2)   nonsmoking_book();
else{

cout   < <   "Please   input   0,   1   or   2!\n "   < <   endl;
system();
}
}

void   smoking_book(){

int   identify   =0;
for   (int   i=0;   i <5;){
if   (a[i]   ==   1)   i++;
else   {
a[i]   =   1;
cout   < <   "Congratulations!   You 've   book   smoking   seat   successfully!\n "
  < <   "The   seat   NO.   is   "   < <   i   +   1   < <   ",   Please   enjoy   your   trip!\n "
  < <   endl;
identify   =   1;
break;
}
}
if   (identify   ==   0){

smoking_booked   =   1;
if   (nonsmoking_booked){

cout   < <   "We   are   so   sorry   that   all   of   our   tickets   had   sold   out.\n "
  < <   "Please   come   and   take   our   next   flight,   next   flight   leaves   in   3   hours.\n "
  < <   "Thank   you   for   using,   See   you   next   time!\n "   < <   endl;
system();
}
string   decision;
cout   < <   "We   are   sorry   to   tell   you   that   smoking   seat   had   sold   out.\n "
  < <   "Would   you   please   change   to   nonsmoking   seat?(Y/N) "   < <   endl;
cin   > >   decision;
if   (decision   ==   "Y ")   nonsmoking_book();