How can i read first line from file?

Question

ifstream infile;

string read_file_name("test.txt");

infile.open(read_file_name);

string sLine;

    while (!infile.eof())
    {
        getline(infile, sLine);         
        cout << sLine.data() << endl;
    }

    infile.close();

This program prints all line in the file, but I want to print only first line.

Answer 1

while (!infile.eof()) does not work as you expected, eof see one useful link

Minor fix to your code, should work:

  ifstream infile("test.txt");

  if (infile.good())
  {
    string sLine;
    getline(infile, sLine);
    cout << sLine << endl;
  }