Question

File opens if I write the full path (full-path/roots.txt).
File fails to open if I write the filename only (roots.txt)

And yet, roots.txt is in the same folder as the main.cpp.
Is there any settings I should check on XCode?

Here’s the code:

    string line;
ifstream infile;
infile.clear();
// infile.open("roots.txt");
infile.open("/Users/programming/C++/roots/roots.txt");
if (infile.fail()) cout << "could not open the file: " << strerror(errno);
getline(infile, line);
cout << line;

Answer 1

If it works when you attempt to open a file with an absolute path and fails with just the filename, your relative path is likely incorrect. Ensure roots.txt is placed in the current working directory. Look into the getcwd function declared in unistd.h.