Why can't c++ programs see the file when run outside of xcode?

Question

C++ / C#

Good evening.
I have a program that needs to read values ​​from a .txt file.
Checked in the program:

fromFile.open("words.txt");
    if (!fromFile.is_open()) 
    {
        cout << "Could not open the file "<<endl;
        cout << "Program terminating.\n";
        exit(EXIT_FAILURE);
    }

When I run the program separately from xcode (I just open the compiled console file), I see that the test condition is met and, accordingly, the program does not see the file.
When run from xcode (cmd + R) everything is fine, the program works.
I did not change the location of the executable file, it lies in the same place where xcode created it.
words.txt is in the same folder as the executable file.

Answer 1

The program tries to look for a file in the current folder . In order for the program to look for a file in the same folder where its executable file is located, you need to take argv[0], strip the program name from it, put the file name in this place and use the resulting value.