How to retrieve data from file in c++

Question

I have a txt file with this format:

<Year> <count>
1999   5.4
1989   5
1993   55.4

I have to get each year and count from the file, convert the year in to int and count in to double and store them in arrays.

Problem: it shows random huge negative numbers

stringstream line;
  string a;
  int year;
  double count;
  ifstream myfile(path);
  if (myfile.is_open())
  {
   getline(myfile, a); //getting rid of the first line.
   while (getline(myfile, a))
   {
    cout << a << '\n';
    line >> year >> count;
    cout << "year:" << year << endl;
    cout << "count:"<< count << endl;

   }
   myfile.close();

Use `std::stringstream` here is the documentation and example: http://www.cplusplus.com/reference/sstream/stringstream/stringstream/ — drescherjm, May 16 '17 at 20:46
Hey I updated my post with your advice. I used Stringstream but Now I get negative random numbers instead of the numbers in the file. — Veliko Kosev, May 16 '17 at 21:07
You are not initializing `line`. See the initialization of `iss` in the duplicate here: http://stackoverflow.com/a/7868998/487892 — drescherjm, May 16 '17 at 21:14

score 0 · Answer 1 · answered May 16 '17 at 20:51

0

You could just stream directly into your variables instead of using getline

Like so:

YourStream >> YearInt >> YourDouble;

Just using a getline at the beginning to get rid of the header.

answered May 16 '17 at 20:51

HSchmale

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Hey I updated my post with your advice. I used Stringstream but Now I get negative random numbers instead of the numbers in the file. – Veliko Kosev May 16 '17 at 21:06

How to retrieve data from file in c++

1 Answers1