Answer from cs61c-ec (Osbert Orr 16671538) for Question 2
#include 
void setTo5(int *num_ptr);

int main ( ) 
{
      int n = 27;
      setTo5 (n);
      printf ("n = %d\n", n);  /* should print n = 5 */
      return 0;
}

void setTo5(int *num_ptr)
{
      *num_ptr = 5;
      return *num_ptr;
}