I am using an if statement to calculate the size of the window, and therefore it needs to go before setup. When I put it before the setup though, I get this error:

I have a for loop that makes the variable i go up by 1 every time it runs. I want to save the variable x every time the for loop runs, for example, when i = 1, the variable would be x1, when i=3, the variable is x3. But I can't get this to work. Any tips? Thanks.