Writing into different files.

[nithishguptak]

Hello all,

I just need a small help,i am not familiar with writing into multiple files.Here is my program,in this based upon the id it has to write to multiple files all by iteself.

  // Positions.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"

#include<sstream>
#include<fstream>
#include<iostream>
#include <cstdlib>
#include <algorithm>
#include<list>
#include<math.h>
#include<conio.h>
#include<string>
using namespace std;

ifstream fileinput;
ofstream fileoutput;

void fileout(int ID, int tag, double& temp6)
{
    stringstream ss;
    ss <<"Id_"<< ID << ".txt";
    std::string filename = ss.str();
    // cout << "ID: " << ID << "\t Filename: " << filename << endl;
    ofstream myout(filename.c_str(), ios::app);
    myout << tag << temp6<<"\t";
    myout.close();
    ss.clear();
}
int main(){
int count=0;
   long line_No=0;
   fileinput.open("12.txt");
   fileoutput.open("output.txt");
   if(!fileinput) { // file couldn't be opened.
      cerr << "Error: file could not be opened" << endl;
      exit(1);
   }
   while(!fileinput.eof()){
	  std::string line,id,timestep,word,wordOne,temp6,temp7,temp8,temp,tag;
			getline(fileinput,line);
			stringstream linestring(line);
			linestring >> id  >> tag>> word >> temp8 >>temp6>>temp7;
			

			if (word == "Position")
			{
				double d;
				stringstream s1(temp6);
				s1 >> d;

		//cout<<tag<<" "<<temp8<<endl;
			
				//istringstream istring (id);
                //int temp_id;
                //istring >> temp_id;
				//fileout(temp_id, temp.tag, temp.temp7);
				
				


				
			}
       }

}

[Manga]

This is a bit over my head. But if I were trying to write to different files, I would just use a seperate file stream for each file.

[Mats]

Yeah what Manga said, simply open up the file you want to modify, stream in the modification, close the file and move along to the next one...