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switch function throwing off my code

Discussion in 'PHP' started by mnymkr, Apr 29, 2007.

0
  1. #1
    Hi , I want to lead in to this saying I am just learning this stuff. I thought I would code something I knew so I went with chemistry stuff.

    This code works great when I enter Ka values into a text box but when I try to use this switch for my radio buttons. I lose it.....any help would be great and any overall code improvements.....

    
<html><head><title>Calculation Result</title></head>
<body>
<?php

// moloarity calculation
$neglog = $pH*-1;


$hydronium = pow (10,$neglog);


if($calc != null)
   {
        switch($calc)
        {
             case "aceticacid" : $Ka=2; break;
             case "ethanoicacid" : $Ka=100; break;
             case "boricacid" : $Ka=1000; break;
             

        }



   
   $result = (pow($hydronium,2)/$Ka) + $hydronium  ;
$resulta = (pow($hydronium,2)/$Ka)   ;
        
        echo("Calculation result: $result");
   



$volume = 0.400;
$moles = $result* $volume;
?>

<form method  = "post" action = "<?php echo $PHP_SELF;?>">
PH: <input type="text" name="pH" size="10">
Ka: 
<input type="radio" name="calc" value= "aceticacid">Acetic Acid
<input type="radio" name="calc" value="ethanoicacid">Ethanoic Acid
<input type="radio" name="calc" value="boricacid">Boric Acid


<input type="submit" value="Calculate">
<input type="reset" value="Clear">
</form>

Hydronium concentration:
<?php echo number_format($hydronium, "6", ".", ","); ?><br />
Inital Molarity (no apprixmation): <?php echo number_format($result, "6", ".", ","); ?> <br />
Inital Molarity (neglect x): <?php echo number_format($resulta, "6", ".", ","); ?> <br />
moles required for <? echo $volume?> Liters of solution: <?php echo number_format($moles, "6", ".", ","); ?> <br />


</body></html>
    Code (markup):
     
    mnymkr, Apr 29, 2007 IP
  2. frankcow

    frankcow Well-Known Member

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    #2
    well, for one, you're not picking up the form $_POST value in the php and assigning it to a variable
     
    frankcow, Apr 29, 2007 IP
  3. mnymkr

    mnymkr Well-Known Member

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    #3
    im not sure if i see what you are talking about

    what do i need to change

    all i know is that i am copying a similar script that does something similar and if i take out the switch it works

    sorry very new to this...
     
    mnymkr, Apr 29, 2007 IP
  4. manilodisan

    manilodisan Peon

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    #4
    manilodisan, Apr 29, 2007 IP
  5. frankcow

    frankcow Well-Known Member

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    #5
    try adding 
    
$calc = $_POST['calc'];
    PHP:
    before
    
if($calc != null)
    PHP:
     
    frankcow, Apr 30, 2007 IP