Answer from cs61c-CN (Shao Lin 16641126) for Question 2
  #include <stdio.h>
  int main () {
      int n = 27;
      setTo5 (n);
      printf ("n = %d\n", n);  /* should print n = 5 */
      return 0;
  }

void setTo5 (int a) {
   a = 5;
   return;
}