<html>
<head>
<title>Calculator </title>
<script>
function compute(obj)
{obj.expr.value = eval(obj.expr.value)}
var one = '1'
var two = '2'
var three = '3'
var four = '4'
var five = '5'
var six = '6'
var seven = '7'
var eight = '8'
var nine = '9'
var zero = '0'
var plus = '+'
var minus = '-'
var multiply = '*'
var divide = '/'
var decimal = '.'
function enter(obj, string)
{obj.expr.value += string}
function clear(obj)
{obj.expr.value = ''}
</script>
</head>
<body>
<form name="calc" method="get">
<table border="1" cellpadding="5">
<tr>
<td colspan="4">
<p align="center"><input type="text" name="expr" size="30" action="compute(this.form)"> </td>
</tr>
<tr>
<td><p align="center"><input type="button" value=" 7 " onclick="enter(this.form, seven)">
</td>
<td><p align="center"><input type="button" value=" 8 " onclick="enter(this.form, eight)">
</td>
<td><p align="center"><input type="button" value=" 9 " onclick="enter(this.form, nine)">
</td>
<td><p align="center"><input type="button" value=" / " onclick="enter(this.form, divide)">
</td>
</tr>
<tr>
<td><p align="center"><input type="button" value=" 4 " onclick="enter(this.form, four)">
</td>
<td><p align="center"><input type="button" value=" 5 " onclick="enter(this.form, five)">
</td>
<td><p align="center"><input type="button" value=" 6 " onclick="enter(this.form, six)">
</td>
<td><p align="center"><input type="button" value=" * " onclick="enter(this.form, multiply)">
</td>
</tr>
<tr>
<td><p align="center"><input type="button" value=" 1 " onclick="enter(this.form, one)">
</td>
<td><p align="center"><input type="button" value=" 2 " onclick="enter(this.form, two)">
</td>
<td><p align="center"><input type="button" value=" 3 " onclick="enter(this.form, three)">
</td>
<td><p align="center"><input type="button" value=" - " onclick="enter(this.form, minus)">
</td>
</tr>
<tr>
<td colspan="2"><p align="center"><input type="button" value=" 0 "
onclick="enter(this.form, zero)"> </td>
<td><p align="center"><input type="button" value=" . " onclick="enter(this.form, decimal)">
</td>
<td><p align="center"><input type="button" value=" + " onclick="enter(this.form, plus)">
</td>
</tr>
<tr>
<td colspan="2"><p align="center"><input
type="button" value=" = " onclick="compute(this.form)"> </td>
<td colspan="2"><p align="center"><input
type="reset" value=" AC " onclick="clear(this.form)" size="3"> </td>
</tr>
</table>
</form>
</body>
</html>
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