web1(php)

WEBI(PHP)
=========
dalam coding
nilai mhs
============
<?php
$na=0;
$nh="";
$ket="";
if (isset($_POST['cari']))
{
$a=$_POST[ntugas];
$b=$_POST[nmid];
$c=$_POST[ns];
$na= 0.2*$a + 0.35*$b + 0.45*$c;
if ($na>=80 and $na<=100){
$nh='A';
$ket='Excellent';
}else if ($na>=65 and $na<80){
$nh='B';
$ket='Good';
}else if ($na>=55 and $na<65){
$nh='C';
$ket='Cukup';
}else if ($na>=40 and $na<55){
$nh='D';
$ket='Syarat Lulus';
}else if ($na<40){
$nh='E';
$ket='Tidak Lulus';

}
}
if (isset($_POST['reset'])){
$_POST['nim']="";
$_POST['nama']="";
$_POST['ntugas']="";
$_POST['nmid']="";
$_POST['ns']="";
$_POST['na']="";
$_POST['nh']="";
$_POST['ket']="";
}









?>

==================================================
dalam desain
=============
NIM       ===> <?php echo $_POST['nim'];?>
nsemester ===> <?php echo $_POST['ns'];?>
nama      ===> <?php echo $_POST['nama'];?>
nilai tugas ===> <?php echo $_POST['ntugas'];?>
nilai mid  ===> <?php echo $_POST['nmid'];?>
nilai akhir ===> <?php echo $na;?>
nilai huruf ===> <?php echo $nh;?>
keterangan ===> <?php echo $ket;?>        
=============================================