Block Testing - Computer

rednet. open("bottom")
monitor = peripheral.wrap("top")
monitor.clear()
monitor.setCursorPos(1,1)
monitor.setBackgroundColour((colours.black))
PC = 17
function checkFloor()
monitor.setCursorPos(2,2)
while true do
    event, senderID, message, distance = os.pullEvent("rednet_message")
    if senderID == PC then
    monitor.write("Floor")
    monitor.setCursorPos(4,4)
    monitor.write(message)
    end
end
end
checkFloor()