PlayerPrefs and increment how to do?

Question

C++ / C#

I have a script

void Start()
{
  PlayerPrefs.GetInt("money");
  PlayerPrefs.GetInt("food");
}
void OnClick()
{
  PlayerPrefs.GetInt("money") -- 26;
  PlayerPrefs.GetInt("food")++;
}

Why does not work and how to do it?

Answer 1

Because it is necessary to use GET / SET.