sfml simple main window

#include <SFML/Graphics.hpp>
#include <iostream>
#include <stdlib.h>

int main(int argc, char **argv) {
	sf::RenderWindow window(sf::VideoMode(800, 600), "test");

	sf::CircleShape circle(100.f);

	circle.setFillColor(sf::Color::Green);

	while(window.isOpen()) {
		sf::Event event;

		while(window.pollEvent(event)) {
			switch(event.type) {
				case sf::Event::Closed:
					window.close();
				break;

				case sf::Event::KeyPressed:
					switch(event.key.code) {
						case sf::Keyboard::Escape:
							window.close();
						break;
					}
				break;
			}
		}

		circle.move(1, 1);

		window.clear();

		window.draw(circle);

		window.display();


	}

	return 0;
}