Help with CSV parsing

howdoicpp (2)
Hi,
I'm pretty new to C++, and wanted to try and read a simple csv file. The format of the file is:

5
1,4
15,23
54,7
9,7

How do I read and store these values as integers? I was thinking of saving them in a vector, but I am not clear on how to read them in the first place.

And yes, the first row in the file has only a single value.
Gamer2015 (686)
I was thinking of saving them in a vector
yeah why not

use std::ifstream! (and a bunch of other std facilities)

Not the most elegant way but it should show you how you could do it.
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#include <fstream>
#include <utility>
#include <iostream>
#include <vector>
#include <sstream>
#include <string>

int main()
{
  std::ifstream file("test.csv");

  std::vector<std::vector<int> > data;
  int dummy;

  std::string temp;
  while(std::getline(file, temp)) // read each line
  {
	std::stringstream stream(std::move(temp));

	data.push_back(std::vector<int>()); // add row

	// split the entries on ','
	while(std::getline(stream, temp, ','))
	{
	  data.back().push_back(std::stoi(temp)); // add entry in last row
	}
  }

  // print result
  for(const auto& row : data) {
	for(const auto& e : row)
	  std::cout << e << ' ';
	std::cout << '\n';
  }

  return 0;
}
Last edited on
howdoicpp (2)
Thank you! That helped a lot!
Gamer2015 (686)
you're welcome!
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