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Java Script Question

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I'm trying to make a calculator using Java and am having some trouble.

A sample of something that i am looking to achieve is like on this site linked: http://moneychimp.com/articles/valuation/pe_ratio.htm

I want something that i can have people who visit my site enter data, hit calculate and get a number.

Any ideas would be great.

Thanks

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First I'd like to mention that Java and Javascript are two different languages and have little to do with each other.

Here's a simple example of a calculator:

<html>

<body>

<script type="text/javascript">

function calculate()

{

var a=document.getElementById("a");

var b=document.getElementById("b");

var ans=document.getElementById("ans")

ans.value = parseInt(a.value) + parseInt(b.value);

}

</script>

<label for="a">A: </label>

<input type="text" name="a" id="a" size="2"/>

and <label for="b">B: </label>

<input type="text" name="b" id="b" size="2"/>

is <input type="text" name="ans"/>

<input type="submit" onclick="calculate()" value="Calculate"/>

</body>

</html>
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