How do I get a sum of two numbers in C#? I can't figure out what I'm missing
<pre><code> //Declare three double variables. num1, num2, sum.
    double num1 = 0;
    double num2 = 0;
    double sum = num1 + num2;

    //Prompt the user to enter in the first number. Must be less than 100.
    Console.Write("Please enter a number less than 100: ");
    num1 = double.Parse(Console.ReadLine());

    //Prompt the user to enter in the second number. Also must be less than 100.
    Console.Write("Please enter a second number less than 100: ");
    num2 = double.Parse(Console.ReadLine());

    //Add the values of num1 and num2 together. Save the result in the variable sum.
    sum = num1 + num2;
</code></pre>
