1	This is the output from pointers-1:
	
	To begin, a is 101, b is -2
	After swap(&a, &b), a is -2, b is 101
	
2	Now pa points to an object with value -2,
2	and pb points to an object with value 101
3	After swap(pa, pb), a is 101, b is -2
	And pa points to an object with value 101,
	and pb points to an object with value -2
	
4	After swaping pa and pb,
	pa points to an object with value -2,
	and pb points to an object with value 101
	But a is 101, b is -2