Answer from cs61c-cd (Charles Leung 15905350) for Question 2
#include <stdout.h>
int main ( ) {
  int n = 27;
  setTo5 (&n);
  printf ("n = %d\n", n);  /* should print n = 5 */
  return 0;
}

extern void setTo5(int *x) {
  *x = 5;
}