local monitor = peripheral.wrap("right")

function newLine()
  x,y = monitor.getCursorPos()
  monitor.setCursorPos(1,y+1)
end

function add(x, y)
  monitor.write(x+y)
  newLine()
end

function subtract(x, y)
  monitor.write(x-y)
  newLine()
end

function multiply(x, y)
  monitor.write(x*y)
  newLine()
end

function divide(x, y)
  monitor.write(x/y)
  newLine()
end
while(true) do
  monitor.clear()
  monitor.setCursorPos(1,1)
  monitor.setTextColor(1024)
  io.write("Enter first number")
  x = io.read(
  io.write("Enter second number")
  y = io.read
  io.write("Enter operation")
  op = io.read

  if op == "add" then
    add(x,y)
  end

  if op == "subtract" then
    subtract(x,y)
  end

  if op == "multiply" then
    multiply(x,y)
  end

  if op == "divide" then
    divide(x,y)
  end