Help required to load a text file into a vector matrix

[amanyasin]

Hi,

I need your help to design a program which can read text file and store in a vector matrix of integer type.

text file contains data like this

0 10
10 23 20
1 16 8 36
8 18 7 16
36 20 6
2 18 7
7 20 33
3 18 8
4 9 6
9 18 28
6 20 7
5 20 6
33 20 7 1
16 19 18 8
18 19 28 16
28 18 9 11

I can not specify the number of rows and columns.

Thanks in advance,

[diedrexler]

You might want to look at this link: http://www.cplusplus.com/doc/tutorial/files/

In addition, you'll be reading the data as strings, you can use the stringstream object to aid your conversion to the "int" data type you desire. link: http://www.cplusplus.com/reference/iostream/stringstream/stringstream/

[amanyasin]

Thank you for reply, Can anyone give me a program template?

[Duthomhas]

Unless I am missing something, that sample data is pathological.

[D80DSL3A]

This program works on your sample data. The methods may not be ideal though...
The test output echoes the file contents well.

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

int main()
{
	vector<vector<int>> matVec;// 2d vector for storing all data read from file
	vector<int> lineVec;// for the entries on each line
	ifstream infile("dataIn.txt");
	if(infile)
	{
		int val = 0;
		while(!infile.eof())
		{
			infile >> val;
			lineVec.push_back(val);
			if( infile.peek() == '\n' )// last entry on the line has been read
			{
				matVec.push_back(lineVec);// push all of the lines entries at once
				lineVec.clear();// prepare to read the next line
			}			
		}
		infile.close();

		// output the matrix contents to test the file read
		for(size_t n=0; n<matVec.size(); ++n)
		{
			for(size_t k=0; k<matVec[n].size(); ++k)
				cout << matVec[n][k] << " ";
			cout << endl;
		}
	}
	else
		cout << "file was not opened." << endl;
	cout << endl;
	return 0;
}

EDIT: I just noticed that the last line doesn't get stored unless it ends with a newline so, make sure a newline appears at the end of the file or fix the program so it works regardless.

[amanyasin]

Thanks all it works