Try this:
<?php
$valuea = (int)$_POST['valuea'];
$valueb = (int)$_POST['valueb'];
$answer = $valuea + $valueb ;
if ($answer > 84){
echo "You meet the requirements for the rule of 85";
}else{
echo "You do not meet the rule of 85";
}
?>
<form method='post' action='/make-a-website/online-calculator'>
<table border="0" width="500px" cellpadding='3' cellspacing='1' class="table">
<tr class="calcheading">
<td colspan="2"><strong>Rule of 85 calculator </strong></td>
</tr>
<tr class="calcrow">
<td>Enter your years of work:</td>
<td align="center"><input type="text" name="valuea" value="<?php echo $valuea; ?>" /></td>
</tr>
<tr class="calcrow2">
<td>Enter your age:</td>
<td align="center"><input type="text" name="valueb" value="<?php echo $valueb; ?>" /></td>
</tr>
<tr class="submit"><td colspan="2"><input type="submit" value="Calculate"/></td></tr>
<tr class="calcrow">
<td><i>The answer is:</td>
<td align="center"><input type="text" value="<?php echo $answer; ?>"></td>
</tr>
</table>
</form>
2
solved PHP simple Calculator problems [closed]