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Transformar percentagem em numero decima


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se quiseres mais elaborado, tenta assim:

<form action="" method="get">
<input type="text" name="perc">
<input type="submit" value="Enviar">
$perc = $_GET['perc'];
if ($perc < 100) {
$dec = $perc / 100;
echo $dec;
echo "Erro, número não válido!";

por que razão uma percentagem tem que ser menor do que 100? (é que nem precisa de ser menor ou igual...)

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