2 订房实现程序如下：
void book_room()
{
customer[i]=new Customer;
int room_standard,day;
cout<<"请您选择预定房间的标准:\n";
cout<<"1.单人间/天 150 元\n2.双人间/天 200 元\n3.标准间/天 300 元\n4.总统套房/天 600 元\
n";
cin>>room_standard;
cout<<"请输入预定天数\n";
cin>>day;
customer[i]->set_day(day);
switch(room_standard)
{
int n;
case 1:
cout<<"住房费用总共为: "<<day*150<<"元\n";
for(n=0;n<20;n++) //从第一个级别的房间中查找一个空闲的房间
{
if(room[n].state==0) //state=0 表示该住房没有被预定的
{
cout<<"预定成功★房间号码为: "<<room[n].number<<endl;
room[n].state=1;
customer[i]->set_room_number(room[n].number);
break;
}
}
break;
case 2:
cout<<"住房费用总共为: "<<day*200<<"元\n";
for(n=20;n<40;n++)
{
if(room[n].state==0)
{
cout<<"预定成功★房间号码为: "<<room[n].number<<endl;
room[n].state=1;
customer[i]->set_room_number(room[n].number);
break;
}
}
break;
case 3:
cout<<"住房费用总共为: "<<day*300<<"元\n";
for(n=40;n<60;n++)
