Sorting programm.

[cppbeginner20]

Hey! I have no code to put here, because I don't really know where to start.. :(

But my problem is this - I need to make a programm, that gets a file with some lines of text (There are topics with IDs in frot of them, and then each line starts with a topics ID followed by one word), and I need the programm to sort the text and put it in a different file like this - to topic wothout the "" and in the next like all the words, that had the topics ID in front.

Should I use a sided-list? And if so, how can I assing the according line to the node??

Can someone PLEASE give me some advice on, how to achieve this? I know it's not good that I have no code, bet I'm a begginer, so...yeah :/

[mutexe]

Split your problem up first into manageable chunks.

First you need to open the file and read it.
See here:
http://www.cplusplus.com/doc/tutorial/files/

specifically the section "Text files".

get that working first. Don't even bother worrying about parsing, storing or sorting yet.

[cppbeginner20]

Yeah, I actually was reading that before. I made somethng like this. This actually does something - it copies the first files text into the second file. That I got, but all the next is a mystery to me...

#include <iostream>
#include <fstream>

using namespace std;


int main(){
ifstream fin("text.in");
ofstream fout("text.out");
 string line;

 while (getline(fin, line, '\n'))
    {
            fout<<line<<endl;
 }


fout.close();
 fin.close();
 return 0;
}

[mutexe]

You're complicating things slightly mate. Like I said don't worry about everything at the same time. worry about writing to another file later.

get the reading working first.

The example I referred to you was:

// reading a text file
#include <iostream>
#include <fstream>
#include <string>
using namespace std;

int main () {
  string line;
  ifstream myfile ("example.txt");
  if (myfile.is_open())
  {
    while ( getline (myfile,line) )
    {
      cout << line << '\n';
     
      // You will have to do extra stuff here, but for now just get 
      // each line printing to your screen.
    }
    myfile.close();
  }

  else cout << "Unable to open file"; 

  return 0;
}

Once you're printing lines to the screen from your file, make sure you understand all the functions in the example as well.

[cppbeginner20]

It's printing and the functions in the example - I understand

[mutexe]

cool. can you give us a real-world example of what one line would look like?

and are you allowed to use vectors?