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<html>
<!-- Addition and Average Program -->
<html xmlns = "http://www.w3.org/1999/xhtml">
<head>
<title>An Addition and Average Program</title>
<script type = "text/javascript">
<!--
var firstNumber, // first string entered by user
secondNumber, // second string entered by user
thirdNumber, // third string entered by user
number1, // first number to add
number2, // second number to add
number3, // third number to add
sum; // sum of number1, number2 and number3
sum=0; // start sum off as a 0, and tell computer sum is a number
// read in first number from user as a string
firstNumber = window.prompt( "Enter first integer", "0" );
number1 = parseInt( firstNumber ); // convert numbers from strings to integers
sum = sum + number1; // add number1 to 0.. Why 0?
// read in second number from user as a string
secondNumber = window.prompt( "Enter second integer", "0" );
number2 = parseInt( secondNumber ); // convert numbers from strings to integers
sum = sum + number2; // add number2 to sum (number1)
thirdNumber = window.prompt( "Enter second integer", "0" );
number3 = parseInt( thirdNumber ); // convert numbers from strings to integers
sum = sum + number3; // add number2 to sum (number1)
// display the results
document.writeln( "<h1>The sum is " + sum + "</h1>" );
document.writeln( "<h1>The average is" + sum/3 + "</h1>" );
// -->
</script>
</head>
<body>
<p>Click Refresh (or Reload) to run the script again</p>
</body>
</html>
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