Question

1. Multiply eax by 26, using shifting and addition instructions.

Note: To test your program, you can set eax to any integer, say, 2. Of course, your code must work even if eax is initialized to another integer.

2. Pack April 15, 2016 into dx   

Note:

1. Define 3 locations day, month, year and initialize them to 15, 4, an 16 respectively (April 15, 2016).
2. Your code packs the values in day, month, year into dx.
3. Your code must work if locations day, month, year are initialized to other values.

Answer 1

1) if eax=2

eax*26=eax+eax+eax+....26 times

   =2+2+2+...….26 times

   =52

This will work even if eax is initialized to some other integer. Say, if eax=3

eax*26=eax+eax+eax+....26 times

   =3+3+3+...….26 times

   =78

2) Pack April 15, 2016 into dx

1. Define 3 locations day, month, year and initialize them to 15, 4, an 16 respectively (April 15, 2016).    day=15 month=4 year=16
2. Your code packs the values in day, month, year into dx.    dx=April 15, 2016
3. Your code must work if locations day, month, year are initialized to other values.    if day=28 month=7 year=19 then dx=July 28, 2019