I have got a problem fixing this code ,it is function error

<?php
  /*function convertgrade($grade)
{
    if($grade >=95)
       $finalgrade='A+';

   elseif ($grade >=90)
        $finalgrade='A' ;

elseif($grade >=85)
        $finalgrade='B+';

elseif($grade >=80)
        $finalgrade='B' ;

elseif ($grade >=75)
        $finalgrade='C+';

elseif ($grade >=70)
        $finalgrade='C';

elseif($grade >=65) 
        $finalgrade='D+';

elseif($grade >=60)
        $finalgrade='D' ;

else $finalgrade='F';

return $finalgrade;
}*/
 extract ($_POST);
$query[0]="UPDATE studentgrade SET Grade =$s1  WHERE ID=101";
$query[1]="UPDATE studentgrade SET Grade =$s2  WHERE ID=102";
$query[2]="UPDATE studentgrade SET Grade =$s3  WHERE ID=103";
$query[3]="UPDATE studentgrade SET Grade =$s4  WHERE ID=104";
$query[4]="UPDATE studentgrade SET Grade =$s5  WHERE ID=105"

 ;$query[5]="UPDATE studentgrade SET Grade =$s6  WHERE ID=106";
$query[6]="UPDATE studentgrade SET Grade =$s7  WHERE ID=107";
$query[7]="UPDATE studentgrade SET Grade =$s8  WHERE ID=108";
$query[8]="UPDATE studentgrade SET Grade =$s9  WHERE ID=109";
$query[9]="UPDATE studentgrade SET Grade =$st  WHERE ID=110";
$query[10]="UPDATE studentgrade SET Grade =$sa  WHERE ID=111";
$query[11]="UPDATE studentgrade SET Grade =$sb  WHERE ID=112";
$query[12]="UPDATE studentgrade SET Grade =$sc  WHERE ID=113";
$query[13]="UPDATE studentgrade SET Grade =$sd  WHERE ID=114";
$query[14]="UPDATE studentgrade SET Grade =$se  WHERE ID=115";


$query[15]="UPDATE studentgrade SET Finalgrade =convertgrade($s1) WHERE ID=101";
$query[16]="UPDATE studentgrade SET Finalgrade =convertgrade($s2)  WHERE ID=102";
$query[17]="UPDATE studentgrade SET Finalgrade=convertgrade($s3)  WHERE ID=103";
$query[18]="UPDATE studentgrade SET Finalgrade=convertgrade($s4)  WHERE ID=104";
$query[19]="UPDATE studentgrade SET Finalgrade=convertgrade($s5)  WHERE ID=105"

;$query[20]="UPDATE studentgrade SET Finalgrade=convertgrade($s6)  WHERE ID=106";
$query[21]="UPDATE studentgrade SET Finalgrade=convertgrade($s7)  WHERE ID=107";
$query[22]="UPDATE studentgrade SET Finalgrade=convertgrade($s8) WHERE ID=108";
$query[23]="UPDATE studentgrade SET Finalgrade=convertgrade($s9)  WHERE ID=109";
$query[24]="UPDATE studentgrade SET Finalgrade=convertgrade($st) WHERE ID=110";
$query[25]="UPDATE studentgrade SET Finalgrade=convertgrade($sa) WHERE ID=111";
$query[26]="UPDATE studentgrade SET Finalgrade=convertgrade($sb) WHERE ID=112";
$query[27]="UPDATE studentgrade SET Finalgrade=convertgrade($sc) WHERE ID=113";
$query[28]="UPDATE studentgrade SET Finalgrade=convertgrade($sd)  WHERE ID=114";
$query[29]="UPDATE studentgrade SET Finalgrade=convertgrade($se) WHERE ID=115";

$con = mysql_connect("localhost","root","");
if (!$con)
  {
  die('Could not connect: ' . mysql_error());
  }

if(!$database=mysql_select_db("ACCT",$con))
die("could not open ACCT database");
for($i=0;$i<count($query); $i++)
{
if(!($result=mysql_query($query[$i],$con)))
{
   print("could not execute query! <br />");
   die(mysql_error() );
}
}
mysql_close($con);
?>




everything in yellow in the code block above WILL NOT run as it is inside a comment block.

remove the /* and the */

Your code is also prone to sql injection, hopefully you won’t use it somewhere online without cleaning your input first.