Temperature conversion: Difference between revisions

=={{header|PHP}}==

<lang php>error_reporting(E_ALL & ~ ( E_NOTICE | E_WARNING ));

while (true) {

echo "\nEnter a value in kelvin (q to quit): ";

if (($kelvin = trim(fgets(STDIN))) !== false) {

if ($kelvin == 'q') {

echo 'quitting';

break;

}

if (is_numeric($kelvin)) {

$kelvin = floatVal($kelvin);

if ($kelvin >= 0) {

printf(" K %2.2f\n", $kelvin);

printf(" C %2.2f\n", $kelvin - 273.15);

printf(" F %2.2f\n", $kelvin * 1.8 - 459.67);

printf(" R %2.2f\n", $kelvin * 1.8);

} else printf(" %2.2f K is below absolute zero\n", $kelvin);

}

}

}</lang>

<pre>Enter a value in kelvin (q to quit): 21

K 21.00

C -252.15

F -421.87

R 37.80

Enter a value in kelvin (q to quit): q

quitting</pre>