text: def main():
      print("Welcome to the calculator app")
      print("Here are he options: ")
      print("1. Add two numbers")
      print("2. Calculate area of circle")
      print("3. Solve 2nd order equation")
  
      option_selected = int(input("Enter the option you wish to do: "))
      if option_selected == 1:
          add_numbers()
      elif option_selected == 2:
          another_function()    
  
  
  def add_numbers():
      x = int(input("Enter one number"))
      y = int(input("Enter another number"))
  
      result = x + y
      print("Result is: ", result)
  
  
  if __name__ == "__main__": main()