Finding all the points within a circle in 2D space

Question

I am representing my 2D space (consider a window), where each pixel is shown as a cell in a 2D array. i.e. a 100x100 window is represented by the array of same dimensions.

Answer 1

seems correct. you can make it slightly faster by finding minY and then doing DoSomething from -rangeY to +rangeY for the current X.

for(dx=0;dx