[PHP] Division by zero

[Gary]

  I am trying t get the percent of votes form the table poll, but keep 
getting Division by zero for the line commented below.

<snip>
if ($res) {
                echo "bla bla bla";
$sql = "SELECT question, responce1, responce2, responce3,
vote1, vote2, vote3, date FROM poll WHERE id = {$_POST['id']}";
     $res = $db->query($sql);
     if (DB::isError($res)) {
         die ($res->getMessage());
     }
          while ($row = $res->fetchRow());
              $id = $row[0];
          $question  = $row[1];
          $responce1 = $row[2];
        $responce2 = $row[3];
        $responce3 = $row[4];
        $vote1 = $row[5];
        $vote2 = $row[6];
        $vote3 = $row[7];
        $date = $row[8];
        
  /* Count the votes*/
  $total = $vote1 + $vote2 + $vote3;
        
/* Caluclate */
$perc_vote1 = round(($vote1/$total)*100,2);  /* Division by zero*/
  $perc_vote2 = round(($vote2/$total)*100,2); /* Division by zero*/
$perc_vote3 = round(($vote3/$total)*100,2);  /* Division by zero*/


<snip>

TIA
Gary


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