Demonstrando as magicas de um asterisco

ponteiro.c

/*
 * ponteiro.c
 * 
 * Copyright 2014 Cristina Silva <cristina.silva@openmailbox.org>
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 * MA 02110-1301, USA.
 * 
 * 
 */


#include <stdio.h>

void valor_sem_ponteiro( int numero )
{
	numero = 10;
	printf( "Valor dentro de referencia: %d\n", numero );
}

void valor_ponteiro( int* numero )
{
	*numero = 10;
	printf( "Valor dentro de ponteiro: %d\n", *numero ); //sem asterisco pega o endereço de memoria
}

int main(void)
{
	int numero = 0;
	
	printf( "Valor original: %d\n", numero );
	valor_sem_ponteiro( numero );
	printf( "Valor referencia: %d\n", numero );
	valor_ponteiro( &numero );
	printf( "Valor ponteiro: %d\n", numero );
	
    return 0;
}