#include<stdio.h>
#include<stdlib.h>
 
 
/* Funcao que recebe os enderecos das variaveis x, y e z.  */
/* O simbolo * indica que sera utilizado o conteudo dessas variaveis. */
/* A ausencia desse simbolo indica a utilizacao do endereco das mesmas. */
void passagem_referencia(int *x_interno, int *y_interno, int *z_interno)
{
	(*x_interno)++;
	(*y_interno)++;
	*z_interno = *x_interno;
 
	/* Impressao do conteudo dos enderecos passados como referencia
	uso obrigatorio do *, caso contrario, serao impressos os enderecos, nao os conteudos */
	printf("Dentro da funcao \"passagem_referencia\":\n");
	printf("x_interno = %d \t Endereco x_interno: %p\n", *x_interno, x_interno);
	printf("y_interno = %d \t Endereco y_interno: %p\n", *y_interno, y_interno);
	printf("z_interno = %d \t Endereco z_interno: %p\n", *z_interno, z_interno);
	printf("\n");
}
 
int main(void)
{
	/* Declaracao de Variaveis e atribuicao de valores  */
	int x = 5, y = 10;
	int z = x + y;
 
	printf("======================================\n");
	printf(" Passagem de variaveis por REFERENCIA \n");
	printf("======================================\n");
	printf("\n");
 
 
	/* Imprime os valores das variaveis x, y e z
	antes de entrar na funcao passagem_referencia(). */
	printf("Antes de entrar na funcao:\n");
	printf("x = %d\n", x);
	printf("y = %d\n", y);
	printf("z = %d\n", z);
	printf("\n");
 
	/* Chama a funcao passagem_referencia e transmite os enderecos das variaveis */
	passagem_referencia(&x, &y, &z);
 
	/* Imprime os valores das variaveis x, y e z
	 apos o termino da execucao da funcao passagem_referencia(). */
	printf("Depois de sair da funcao:\n");
	printf("x = %d\n", x);
	printf("y = %d\n", y);
	printf("z = %d\n", z);
 
	return 0;
}
 

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