Quartos.php

<?php
public function salvar_atualizacao() {    
    $quarto = array(
            'id_quarto'    => $this->input->post('id_quarto'),
            'ct_quarto'    => $this->input->post('ct_quarto'),
            'num_quarto'   => $this->input->post('num_quarto'),
            'jovem_quarto' => $this->input->post('jovem_quarto'),
            'responsavel'  => $this->input->post('responsavel'),
            'localizacao'  => $this->input->post('localizacao'),
            'dataem'       => $this->input->post('dataem')
        );

    $this->db->where('id_quarto', $quarto['id_quarto']);
    $this->db->update('quartos', $quarto);    
}