ballBounce

local LR,UD = 0,0
while true do
  X, Y = term.getCursorPos()
  local function drawBall(x,y)
    term.setCursorPos(x,y)
    print("O")
  end
  if X == 1 then
    LR = 1
  elseif X == 51 then
    LR = 0
  end
  if Y == 1 then
    UD = 0
  elseif Y == 19 then
    UD = 1
  end
  if LR == 1 then
    xpos = X + 1
  elseif LR == 0 then
    xpos = X - 1
  end
  if UD == 1 then
    ypos = Y + 1
  elseif UD == 0 then
    ypos = Y - 1
  end
  drawBall(xpos,ypos)
  sleep(0)
end