Item no. 10 from w3resource basic javascript exercises

Instructions: Ask for 2 numbers then ask whether to multiply or divide, then display answer

Output:
1st number:
2nd number:



Answer:
My code: 

<script>
  function multiply() {
    var num1 = document.getElementById("num1").value;
    var num2 = document.getElementById("num2").value;
    document.getElementById('ans').innerHTML = num1 * num2;
  }

  function divide() {
    var num1 = document.getElementById("num1").value;
    var num2 = document.getElementById("num2").value;
    document.getElementById('ans').innerHTML = num1 / num2;
  }
</script>
Author's notes:

I see.... the order of declaring and executing stuff matters!