c std::fstream. How do I read a number at the start of the line (a float or an int), and then skip-CodePudding

I have a text file in the following format:

100 #gravity
5000 #power
30 #fulcrum

I want to assign these values to named variables, like so:

void Game::reloadAttributes()
{
    float test1, test2, test3;
    
    string line;
    std::fstream file;
    file.open("attribs.txt");

    if (file.is_open()) {                

        cin >> test1;
        file.ignore(50, '\n');

        cin >> test2;
        file.ignore(50, '\n');

        cin >> test3;
        file.ignore(50, '\n');

        file.close();
    } 
    else
    {
        cout << "\n****Couldn't open file!!****\n" << endl;
    }

    cout << ">>>> " << test1 << ", " << test2 << ", " << test3 << endl;
}

Of course, these aren't destined for the local test variables, but in fields belonging to the Game class, just using these to test its reading correctly. The program just hangs at cin >> test1. Ive tried using getLine(file, line) just beforehand, that didnt work. What am I doing wrong? Cheers

CodePudding user response：

You're using cin instead of file for your input lines.

Instead of cin >> test1;, do file >> test1;. Then it should work fine.

CodePudding user response：

An object of type istream (in this case cin) takes user input. So of course the program will wait for you to input a value and then store it inside test1, test2, and test3 respectively.

To fix your issue, just replace cin with file as such:

file >> test1;
file.ignore(50, '\n');

file >> test2;
file.ignore(50, '\n');

file >> test3;
file.ignore(50, '\n');

file.close();

Output:

>>>> 100, 5000, 30