Calculator program in Ruby not running properly

So, basically, I am practicing if statements in Ruby and trying to make a simple calculator, but this puts out something so strange. If I enter an operator of "+" or any other operator it just does not do the calculation. I don't know why. I am genuinely clueless here. The code seems to be perfectly fine to me.

puts "Enter first number: "
num1 = gets.chomp().to_f
puts "Enter operator: "
op = gets.chomp().to_f
puts "Enter second number: "
num2 = gets.chomp().to_f

if op == "+"
  puts (num1 + num2)
elsif op == "-"
  puts (num1 - num2)
elsif op == "/"
  puts (num1 / num2)
elsif op == "*"
  puts (num1 * num2)
else
  puts "Invalid operator"
end

Any operator I input I always get "Invalid operator" text on the screen instead of the calculation. If I remove the "invalid operator" else statements then nothing gets printed out.