Write a script that takes three integers from the user and displays the sum, average, product, smallest and largest of the numbers in an alert dialog.

<?xml version = "1.0" encoding = "utf-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
<head>
<title>Exercise 6.18 Three Digit Math </title>
<script type="text/javascript">
<!--
var firstnum;
var secondnum;
var flag = 0;
firstnum = window.prompt("Enter any Integer Value:");
secondnum = window.prompt("Enter any second Integer Value:");
thirdnum = window.prompt("Enter any third Integer Value:");
var first = parseInt(firstnum);
var second = parseInt(secondnum);
var third = parseInt(thirdnum);
var sum = first + second + third;
var avg = (first + second + third) / 3;
var prod= first * second * third;
if(first>=second && first>=third)
{
if(second>third)
{
window.alert( " SUM: " + sum + "\n Average: " + avg + "\n Product: " + prod + "\n" + third + " is the smallest number" + "\n" + first + " is the largest of all three numbers" );
}
else
{
window.alert( " SUM: " + sum + "\n Average: " + avg + "\n Product: " + prod + "\n" + second + " is the smallest number" + "\n" + first + " is the largest of all three numbers" );
}
}
else if(second>=first && second>=third)
{
if(first>third)
{
window.alert( " SUM: " + sum + "\n Average: " + avg + "\n Product: " + prod + "\n" + third + " is the smallest number" + "\n" + second + " is the largest of all three numbers" );
}
else
{
window.alert( " SUM: " + sum + "\n Average: " + avg + "\n Product: " + prod + "\n" + first + " is the smallest number" + "\n" + second + " is the largest of all three numbers" );
}
}
else if(third>=first && third>=second)
{
if(first>second)
{
window.alert( " SUM: " + sum + "\n Average: " + avg + "\n Product: " + prod + "\n" + second + " is the smallest number" + "\n" + third + " is the largest of all three numbers" );
}
else
{
window.alert( " SUM: " + sum + "\n Average: " + avg + "\n Product: " + prod + "\n" + first + " is the smallest number" + "\n" + third + " is the largest of all three numbers" );
}
}
// -->
</script>
</head>
<body>
</body>
</html>