# prompt: Using Gradio to write a simple calculator app

import gradio
def calculator(num1, operation, num2):
  if operation == "add":
    return num1 + num2
  elif operation == "subtract":
    return num1 - num2
  elif operation == "multiply":
    return num1 * num2
  elif operation == "divide":
    return num1 / num2

demo = gradio.Interface(
    fn=calculator,
    inputs=["number", gradio.Radio(["add", "subtract", "multiply", "divide"]), "number"],
    outputs="number")

demo.launch()