New to php - Temp convertion

[swizenfeld]

Hello i just started working with php and i am kind of stuck here

i want to be able to enter a number in an xhtml page and then select from a drop down menu Celsius, Kelvin, or Fahrenheit. (which i already created) and then get the convertion.

 

result should be :

 

example: Enter number :  1    Select from drop menu : Celsius

 

Celsius = 1

Kelvin = xxx

Fahrenheit = xxx

 

 

if need a better visual you can see a perfect example here

http://cim.saddleback.edu/~skinoshita1/cim225/h10input.html

[cags]

So what's your question? If the question is how to convert one to the other it seems a bit out of the scope of the forum and can easily found with a 2 second Google search. Or is your question about how to proceed programatically? If your after something similar to the link you provided it's a simple switch statement or an if/elseif nest to calculate.

 

if($_GET['type'] == 'Celsius') {
   $Kelvin = $_GET['temp'] - 273.15;
   $Fahrenheit = 'whatever the formula is';
   $Celsius = $_GET['temp'];
} elseif($_GET['type'] == 'Kelvin') {
   $Kelvin = $_GET['temp'];
   $Fahrenheit = 'whatever';
   $Celsius = $_GET['temp'] + 273.15;
} elseif($_GET['type'] == 'Fahrenheit') {
   $Kelvin = 'whatever';
   $Fahrenheit = 'whatever';
   $Celsius = 'whatever';
} else {
   die("Error");
}

echo 'Kelvin = ' . $Kelvin . '<br/>';
echo 'Fahrenheit = ' . $Fahrenheit . '<br/>';
echo 'Celsius' = ' . $Celsius . '<br/>';

I'm not sure on the exact formula for converting Fahrenheit, but I'm sure it can be found in about 5 seconds flat.