C++中#include头文件的示例详解

void baocun() {             //写文件 
 int i;
  ofstream booklist2("booklist.txt",ios::out);
  booklist2<<"书目     作者   现有数量   总库存";
  for(i=1; i<=shuliang; i++) {
     booklist2<<endl;
     booklist2<<book[i].name<<"   "<<book[i].author<<"   "<<book[i].num<<"   "<<book[i].total<<endl;
  }
  booklist2.close();
} 

void addbook(string str){         //增加书 
 int i;
   for(i=1; i<=shuliang; i++) {
     if(book[i].name==str) {
     int a;
     cout<<"请输入作者名："<<endl;
     cin>>book[i].author;
     cout<<"添加数目："<<endl;
  cin>>a; 
       book[i].num+=a;
       book[i].total+=a;
       break;
     }
   }
   if(i==shuliang+1) {
     book[i+1]=book[i];
     book[i].name=str;
     int a;
     cout<<"请输入作者名："<<endl;
     cin>>book[i].author;
     cout<<"添加数目："<<endl;
  cin>>a; 
     book[i].num+=a;
     book[i].total+=a;
     shuliang++;
   }
   cout<<"添加成功"<<endl;
   cout<<"书目《"<<book[i].name<<"》的总库存为"<<book[i].total<<",目前有"<<book[i].num<<"本。\n"<<endl;
   cout<<"回车键返回主菜单。"<<endl;
   system("pause");
}