Magento: check is product configurable or simple

<?php
     $producttype= $_product->getTypeId();
     //echo $type;
     switch ($type) {
         case "simple":
         echo "Simple";
         break;
         case "configurable":
         echo "Configurable";
      }
 ?> 

Or

if ($_product->isConfigurable()){
    echo "config";
}
//or
if ($_product->isSimple()){
   echo "Simple";
}

or an another way

<?php
    switch ($_product->getTypeId()) {
        case Mage_Catalog_Model_Product_Type::TYPE_SIMPLE:
            echo "Simple";
            break;
        case Mage_Catalog_Model_Product_Type::TYPE_BUNDLE:
            echo "Bunle";
            break;
        case Mage_Catalog_Model_Product_Type::TYPE_CONFIGURABLE:
            echo "Configurable";
            break;
        case Mage_Catalog_Model_Product_Type::TYPE_GROUPED:
            echo "Grouped";
            break;
        case Mage_Catalog_Model_Product_Type::TYPE_VIRTUAL:
            echo "Virtual";
            break;
    }
?>