#include<stdio.h>

void rotar_referencia(int* a, int* b, int* c, int* d);
void rotar_valor(int a, int b, int c, int d);

int main(int argc, char* argv[]){
	
	int a, b, c, d;
	a = 1;
	b = 2;
	c = 3;
	d = 5;
	printf("a = %d\t b = %d\t c = %d\t d = %d\n", a, b, c, d);

	rotar_valor(a, b, c, d);

    printf("a = %d\t b = %d\t c = %d\t d = %d\n", a, b, c, d);

	rotar_referencia(&a, &b, &c, &d);

	printf("a = %d\t b = %d\t c = %d\t d = %d\n", a, b, c, d);

}

void rotar_referencia(int* a, int* b, int* c, int* d){

	int aux = *a;
	*a = *d;
	*d = *c;
	*c = *b;
	*b = aux;	
}

void rotar_valor(int a, int b, int c, int d){

	int aux = a;
	a = d;
	d = c;
	c = b;
	b = aux;
}