calc.html

<html>
<head>
   <title>Advanced Calculator</title>

<script language=javascript type="text/javascript">

var plus,minus,divide,multiply,max,pow,min

function initialize(){
 plus=document.calc.operator.options[0]
 minus=document.calc.operator.options[1]
 divide=document.calc.operator.options[2]
 multiply=document.calc.operator.options[3]
 max=document.calc.operator.options[4]
 pow=document.calc.operator.options[5]
 min=document.calc.operator.options[6]
}

function calculate(){
    a = parseInt(document.calc.val1.value)
    b = parseInt(document.calc.val2.value)
    if (plus.selected)
        document.calc.answer.value = a + b
    if (minus.selected)
        document.calc.answer.value = a - b
    if (divide.selected)
        document.calc.answer.value = a / b
    if (multiply.selected)
        document.calc.answer.value = a * b
	if (max.selected)
		document.calc.answer.value = Math.max(a,b)
	if (pow.selected)
		document.calc.answer.value = Math.pow(a,b)
	if (min.selected)
		document.calc.answer.value = Math.min(a,b)
}

</script>

</head>

<body onLoad="initialize()">
<h2>Calc</h2>

Enter a number in the first box and a number in the second box and select the answer button to see the answer.
<br>
Change the operation via the dropdown selection box if desired.
<form name="calc" action="post">
<input type=text name=val1 size=5>

<select name=operator>
<option value=plus>+
<option value=minus>-
<option value=divide>/
<option value=multiply>*
<option value=max>max
<option value=pow>**
<option value=min>min
</select>

<input type=text name=val2 size=5>
=
<input type=text name=answer size=10>
<input type=button value="show answer" onClick="calculate()">
</form>

<br><br>


</body>
</html>