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calc by medinburgh 

number1 = ask "what is the first number?"
number2 = ask "what is the second number?"
operation = ask "what operation? (enter +, -, *, /)"
  if operation == "+"
    alert number1.to_f + number2.to_f
  elsif operation == "-"
    alert number1.to_f - number2.to_f
  elsif operation == "*"
    alert number1.to_f * number2.to_f
  elsif operation == "/"
    alert number1.to_f / number2.to_f
  else end