Exercise 2  and 3 PAG 153


2.  What is the effect of the code


	push	ax                    	SAVE ax ON THE STACK

	push	bx		SAVE bx ON THE STACK

	pop	ax		RESTORE VALUE OF ax FROM THE STACK
	
	pop	bx 		RESTORE VALUE OF bx FROM THE STACK




3.  Why can't we save and restore sp in a subprogram using

	push	sp
	....
	pop 	sp

A.  Because in order to pop the saved value back into sp, sp has already have the correct value.