text: #include <stdio.h>
  void troca_valores(int *x, int *y) {
    printf("endereço de x, y troca: %p %p\n",
           x, y);
    int aux = 0;
    aux = *x;
    *x = *y;
    *y = aux;
  }
  int main(void) {
    int x = 7;
    int y = 10;
    printf("endereço de x, y main: %p %p\n",
           &x, &y);
    printf("%d %d\n", x, y);
    troca_valores(&x, &y);
    printf("%d %d\n", x, y);
    return 0;
  }
  