<form id="form1" name="form1" method="post" action="">
  <table width="356" border="0">
    <tr>
      <td width="136">&nbsp;</td>
      <td width="1">&nbsp;</td>
      <td width="13">&nbsp;</td>
      <td width="7">&nbsp;</td>
      <td width="165">&nbsp;</td>
    </tr>
    <tr>
      <td>1.Not:</td>
      <td colspan="4"><input type="text" name="textfield"  /></td>
    </tr>
    <tr>
      <td>2.Not:</td>
      <td colspan="4"><input type="text" name="textfield2" /></td>
    </tr>
    <tr>
      <td>3.Not:</td>
      <td colspan="4"><input type="text" name="textfield3" /></td>
    </tr>
    <tr>
      <td>Ders T&uuml;r&uuml; </td>
      <td colspan="4"><select name="menu1" onchange="MM_jumpMenu('parent',this,0)">
        <option value="zorunlu">Zorunlu Ders</option>
        <option value="secmeli">Seçmeli Ders</option>
      </select></td>
    </tr>
    <tr>
      <td>Tekrar Durumu: </td>
      <td colspan="4">&nbsp;</td>
    </tr>
    <tr>
      <td><p>
        <label>
          <input type="radio" name="radio" value="1" checked />
          1.Kez alıyor.</label><br />
        <label>
          <input type="radio" name="radio" value="2" />
          2. Kez alıyor</label><br />
        <label>
          <input type="radio" name="radio" value="3" />
          3. Kez alıyor. </label><br />
      </p></td>
      <td colspan="4">&nbsp;</td>
    </tr>
    <tr>
      <td>&nbsp;</td>
      <td colspan="4"><label>
        <input type="submit" name="Submit" value="Hesapla" />
      </label></td>
    </tr>
  </table>
</form>  

<?php


    if(isset($_POST["textfield"]) or isset($_POST["textfield1"]) or isset($_POST["textfield3"]) ){
    
        
    
    
    $not1      = $_POST["textfield"];
    $not2      = $_POST["textfield2"];
    $not3      = $_POST["textfield3"];
    $kez       = $_POST["radio"];
    $zorunlu = $_POST["menu1"];
    
    if(!is_numeric($not1) or !is_numeric($not2) or !is_numeric($not3)){
    
        echo "Lütfen alanların hepsine numara giriniz";
        
        exit;    
    
    
    
    }
    

    if($zorunlu == "zorunlu"){
    
    
        $not1 = $not1 / 100 * 40;
        $not2 = $not2 / 100 * 20;
        $not3 = $not3 / 100 * 40;
        
        echo "1. Not:<strong>".$not1."</strong><br />";
        echo "2. Not:<strong>".$not2."</strong><br />";
        echo "3. Not:<strong>".$not3."<strong><br />";
        
        echo "Bu Dersi ".$kez." kez alıyor";
    
    
    
    }elseif ($zorunlu == "secmeli"){
    
    
        $not1 = $not1 / 100 * 30;
        $not2 = $not2 / 100 * 30;
        $not3 = $not3 / 100 * 40;
        
        echo "1. Not:<strong>".$not1."</strong><br />";
        echo "2. Not:<strong>".$not2."</strong><br />";
        echo "3. Not:<strong>".$not3."<strong><br />";
        
        echo "Bu Dersi ".$kez." kez alıyor";
    
    
    }
    
        
    
}else {

    echo "Form Alanlarını Boş Bıraktın";

}






?>