#include
	// Assign the value of 5 to the integer variable pointed
	// to by ptr.
	//
	// This should only take one line of code!
	void
	set_to_five(int *ptr)
	{
	// TODO: Your code here.
	assert(0);
	}
	// Return the sum of all elements in the given array. The array
	// "arr" has "n" elements.
	//
	// Note that before, we used pointers to reference single variables
	// in memory, but now we are using them to refer to many elements.
	// The "arr" pointer points to the first element in the array in memory.
	// Because pointers themselves don't carry any length information
	// (like array objects do in Java), we generally have to pass in a
	// length parameter to functions which use pointers to reference
	// arrays.
	int
	array_sum(int *arr, int n)
	{
	// TODO: Your code here.
	assert(0);
	return -1;
	}