C++: Using ifstream with getline();

Question

Check this program

ifstream filein("Hey.txt");
filein.getline(line,99);
cout<<line<<endl;
filein.getline(line,99);
cout<<line<<endl;
filein.close();

The file Hey.txt has alot of characters in it. Well over a 1000

But my question is Why in the second time i try to print line. It doesnt get print?

Answer 1

The idiomatic way to read lines from a stream is this:

std::ifstream filein("Hey.txt");

for (std::string line; std::getline(filein, line); ) 
{
    std::cout << line << std::endl;
}

Notes:

• No close(). C++ takes care of resource management for you when used idiomatically.

• Use the free std::getline, not the stream member function.

Answer 2

According to the C++ reference (here) getline sets the ios::fail when count-1 characters have been extracted. You would have to call filein.clear(); in between the getline() calls.