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<!DOCTYPE html>

<!-- Addition script. -->
<html>

<head>
    <meta charset="utf-8">
    <title>Add and Multiply Program</title>
    <script>


        var number1; // first number to add
        var number2; // second number to add
        var sum; // sum of number1 and number2
        var product; // product of number1 and number2

        // read in first number from user as a string, use the window object’s prompt method
        // The window object is a global object  - all methods and properties that are not part of another object are part of the window object

        number1 = window.prompt("Enter first integer");
        // read in second number from user as a string – note you can omit the object name and dot operator 
        // when referring to properties or attributes of the window object because it is global

        number2 = window.prompt("Enter second integer");

        number1 = parseInt(number1);
        number2 = parseInt(number2);
        sum = parseInt(number1) + parseInt(number2); // add the numbers
        product = number1 * number2; //multiply the numbers

        // display the results – uses the document object, highest object in the DOM structure. You have to use object name and dot operator.
        document.writeln("<h1>The program returns " + sum + " as the sum, and</h1>");
        document.writeln("<h1>" + product + " as the product</h1>");
    </script>
</head>

<body></body>

</html>