How Do I Print A Star Pattern Like This In C

I'm assuming so far you have a cross, like this: +
This means you draw a * if x==1/2 of width-1 or if y== 1/2 of height-1.

Let's just look at the top-left corner. Assuming the origin (0,0) is the top left, what do you notice about the relationship of the x and y axis where the *s are printed? Simple - if (x==y) then draw a *. This works for the whole line extending from the top-left to the bottom-right.
A very small modification to this check will tell you when you need to draw a * to do the line from top-right --> bottom-left. :)

No problem. You're welcome. :)