I've written a minimal program to demonstrate this. When the afore mentioned keys are pressed, a value of -1 is returned.
#include <SFML/Window.hpp>
#include <SFML/Graphics.hpp>
#include <iostream>
int main()
{
sf::RenderWindow window(sf::VideoMode(800, 600), "SFML window");
window.setActive();
while (window.isOpen())
{
sf::Event event;
while (window.pollEvent(event))
{
switch (event.type)
{
case sf::Event::Closed : window.close(); break;
case sf::Event::KeyPressed : std::cout << event.key.code << "\n"; break;
}
}
window.clear();
window.display();
}
return 0;
}