1 #include <iostream>
      2 #include <fstream>
      3 #include <map>
      4
      5
      6 class Commodity {
      7         private:
      8                 int id_;
      9                 std::string name_;
     10                 int price_;
     11         public:
     12                         Commodity() {
     13                                 id_ = 0;
     14                                 name_ = std::string("");
     15                                 price_ = 0;
     16
     17                         }
     18                         Commodity(int id, std::string name, int price) {
     19                                 id_ = id;
     20                                 name_ = name;
     21                                 price_ = price;
     22
     23                         }
     24                         ~Commodity() {}
     25                         void  saveFile(std::string filename) {
     26                                 std::ofstream output(filename.c_str(), std::ios::app);
     27                                 output << id_ << " " << name_ << " " << price_ << std::endl;
     28
     29
     30 output.close();
     31                                 return;
     32
     33
     34                         }
     35
     36
     37 };
     38
     39
     40 class Pos {
     41 private:
     42 std::map<int, Commodity> Mcommodity;
     43 public:
     44 Pos(){
     45 std::map<int, Commodity> Mcommodity;
     46 }
     47
     48 int function(int id, Commodity co)
     49 {Mcommodity[id]=co;
     50
     51 };
  52


     58 int main(){
     59 Pos Pos =pos();
     60
     61 std::ifsteam commodity("commodity.txt");
     62 while( commodity>>co_id>>co_name>>co_price) {        //여기에서 co_id가 결정됨!
     63 Commodity co( co_id, co_name, co_price);
     64 (int id; 779999<id<880023)			     //따라서 여기서 id라는 변수를 넣을 필요가 없음
	{Pos.function(id,co)}				     //id를 co_id로...
     65
     66 }
     67
     68 int co_id;				             //변수 선언은 변수를 쓰기 전에(co_id가 위에 쓰였으니 그줄 위 아무데나 선언)
     69 std::string co_name;				     //마찬가지...
     70   int co_price;
     71
     72 std::ifstream commodity("commodity.txt");				//이제는 지워도 되는 예제부분
     73   while( commodity>>co_id>>co_name>>co_price) {
     74     std::cout<<co_id<<" "<<co_name<<" "<<co_price<<std::endl;
     75     Commodity co( co_id, co_name, co_price );
     76     if ( co_id == 880001) {
     77       co.saveFile("output.txt");
     78     }
     79   }
     80
     81
     82
     83
     84   return 0;
     85 }