main.cpp

// library
#include <SFML/Graphics.hpp>
#include <iostream>

// main program
int main()
{
    // create window
    sf::RenderWindow window(sf::VideoMode({800, 600}), "Title");

    // start clock
    sf::Clock clock;

    // window loop
    while (window.isOpen())
    {
        float dt = clock.getElapsedTime().asSeconds();
        if (dt >= 1.f / 1000.f)
        {
            clock.restart();
            float fps = 1.f / dt;
            std::cout << fps << '\n';
    
            // handle events
            while (auto event = window.pollEvent())
            {
                // on close button press
                if (event->is<sf::Event::Closed>())
                {
                    // close window
                    window.close();
                }
            }
    
            // fill background color
            window.clear(sf::Color(64, 64, 64));
    
            // update display
            window.display();
        }
    }

    // program end successfully
    return 0;
}