kirikou php kiwi

<!DOCTYPE html>
<html>
    <head>
    	<title>Impot</title>
        <meta charset="utf-8" />
    </head>

    <body>
    		<?php
    		include "library.php";

    		if((!isset($_POST["nom"]) and $_POST["nom"] != "")
    			or (!isset($_POST["revenu"]) and $_POST["revenu"] != "")
    			or (!isset($_POST["civilite"]) and $_POST["civilite"] != "")){

    		?>

	    		<form method="post" action="impot.php">
	    			<insput type = "radio" name = "civilite" />Monsieur<insput type = "radio" name = "civilite" />Madame
	    			<input type = "text" placeholder = "Saisir nom" required name = "nom" />
	    			<input type = "text" placeholder = "Saisir revenu" required name = "revenu" />
	    			<input type = "submit" value = "Calculez !" />
	    		</form>

    		<?php
    		}

    		else{

    			$civilite = $_POST["civilite"];
    			$nom = $_POST["nom"];
    			$revenu = $_POST["revenu"];

    			$imp = new Impot($nom, $revenu);

    			echo $civilite . " " . $imp->;
    		}

    		?>
    </body>
</html>