Read a \t and \n separated file

[ledzf]

Hello,

I have a file which separated each line with \n and in each line, each data is separated by \t, that is;
A \t B \t C \n

I try to read this file and assign it into array, but I got stuck in getting next tab. How can I read the next tab?

Thanks in advacne.

#include <iostream>
#include <fstream>
using namespace std;


int main()
{
	ifstream file("abc.txt");

	char text[10];

	char buffer[256];

	file.getline(buffer, 256, '\n');
	for (int i = 0; buffer[i] != '\t'; i++) {
		buffer[i] = text[i];
	}

	return 0;
}

[vlad from moscow]

If the number of data in each line is unknown then it is better to use some standard container as for example std::vector or std::list. As for splitting each line into data elements then you should use std::istringstream and the same getline function.

[ledzf]

Thanks for your reply dude.
Is it possible to use 2D array instead of vector?
Suppose I know the maximum data in each row, is it possible to not to use istringstream?
Sorry for that as I am very new to C++. :(

[vlad from moscow]

If you indeed know the maximum number of data in each row then you can use a 2D array. But the problem is how to distinguish an actual data in a row from an empty slot that is you need to support an additional array of numbers of actual data in each row of the 2D array.

[ledzf]

Thank you. After some reading about istringstream I still cannot figure it out how to use. Until now I only successfully separated the tab by using:

	stringstream iss(buffer);
	string temp;
	while ( getline(iss, temp, '\t') ) {
		cout << temp << endl;
	}

How to assign each data with specific field?
Suppose I have a txt file:
ID \t Name \t Score \n
I wish to store ID to int ID, Name to string Name and Score to int Score?
Thanks!

[vlad from moscow]

You can use this code snip as a base for your code.

struct record
{
   int ID;
   std::string Name;
   int Score;
};

std::ifstream file( "abc.txt" );
std::vector<record> v;

std::string line;

while ( std::getline( file, line ) )
{
   std::istringstream is( line );
   record r;
   std::string s;

   std::getline( is, s, '\t' );
   r.ID = std::stoi( s );
   std::getline( is, r.Name, '\t' );
   std::getline( is, s, '\t' );
   r.Score = std::stoi( s );

   v.push_back( r );
}