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A simple calculator written in PHP. Later versions will include more operators.

<!---Head--->
The first box is the first number to calculate, the second is the operator (* / + -) and the third is the second number.


<!---Body--->

<?php

/* Calculator */


if($submit)
{
    if($operator == '*')
    {
        echo $numa * $numb;
    } elseif($operator == '/')
    {
        echo $numa / $numb;
    } elseif($operator == '+')
    {
        echo $numa + $numb;
    } elseif($operator == '-')
    {
        echo $numa - $numb;
    }
} else { ?>
<form method="POST" action="<?php $_SERVER['PHP_SELF']; ?>">
  <input type="text" name="numa" size="10">
  <input type="text" name="operator" size="2">
  <input type="text" name="numb" size="10">
  <input type="submit" value="Calculate" name="submit">
</form>
<?php } ?>