SFML Example with Comments

#inlcude <SFML/System.hpp> // For sf::Clock
#include <SFML/graphics.hpp> //All the other stuff we need for now is in here

using namespace std; // I like to use this, personally

int main(){
    sf::RenderWindow app(sf::VideoMode(800, 600), "Graphics, woo!"); // Sets up screen with resolution of 800x600 and with a title
    sf::View view(sf::FloatRect(0, 0, 800, 600)); // View is like a camera into our window. useful if you are in need of different views or move the camera

    sf::Clock clock;

    sf::CircleShape c(2); // Creates a circle object with a radius of 2

    c.setPosition(800/2, 600/2); //Sets c to the center of the window
    c.setOutlineColor(sf::Color::Red);
    c.setFillColor(sf::Color::Blue);

    while(app.isOpen()){
    float dt = (float)(clock.reset().asSeconds())
    //Start of our main loop
        pollEvents(app);

    //Poll Inputs
    if(sf::Keyboard::isKeyPressed(sf::Keyboard::W)){
        view.move(0, dt * -10);
    }
    if(sf::Keyboard::isKeyPressed(sf::Keyboard::A)){
        view.move(dt * -10, 0);
    }
    if(sf::Keyboard::isKeyPressed(sf::Keyboard::S)){
        view.move(0, dt * 10);
    }
    if(sf::Keyboard::isKeyPressed(sf::Keyboard::D)){
        view.move(dt * 10, 0);
    }

    if(sf::Keyboard::isKeyPressed(sf::Keyboard::Escape)){
        app.close();
    }

    //This is actually a very bad way of handling inputs, use a message pump instead

    //Drawing
        app.clear();
        app.setView(view); // Good idea, if you are using multiple views
        app.draw(c); // Draw our circle
        app.display(); // Update our window

    }

    return 0;

}

void pollInputs(sf::RenderWindow& app){
    sf::Events e;

    while(app -> pollEvent(e)){
        if(e.type == sf::Event::Closed){
            app -> close(); // Close the window if X is clicked
        }
    }
}