Doing binary conversions by hand

[amanda22]

I am having a time with these problems:

X=1100110000110 011
Y=0000111100001 010

1) what would I get in binary representation for X<<5?

2) what is the two's complement of negative Y (-Y)?

3) If X is an int variable, what do we know about the value of X&X?
a. It is always equal to X.
b. It is always greater than 1.
c. It is always equal to zero.
d. It is always equal to 1.

[sicarie]

What are you having trouble with? Did you try them? What did you get?

[AHMEDYO]

HI.,..

i cant understand Q1 fully, but if you wanna all binary values for x < 5 then

Q1: x=000 , 001 , 010 , 011 , 100

Q2: to get the 2's complementer first u reverse all bits 0s to 1s and all 1s to 0s and then additional the result by 1

Y=0000111100001 010

1's Complementer =11110000111101 01
2's Complementer =00000000000000 01

and then add each 2 bits ------------------------------
= xxxxxxxxxxxxxxx x

the result is the 2's complementer for Y or -Y by 2's complementer

Q3: answer is choice A

try to check behind me i cant exactly rememmber all things, but i think it will right answer..

by the way is that home work? :D

GOOD LUCK..

[Ganon11]

Q1 isn't asking about the < operator, but the bitshift operator <<, which I believe moves the entire set of bits to the left, creating 0s at the end. For instance,

X = 0100 1101
X << 2
(X is now 0001 0011 0100)

Of course, I could be wrong.

[AHMEDYO]

Q1 isn't asking about the < operator, but the bitshift operator <<, which I believe moves the entire set of bits to the left, creating 0s at the end. For instance,

X = 0100 1101
X << 2
(X is now 0001 0011 0100)

Of course, I could be wrong.

hey..no man i think that you fully right, its SHL operator

Many Thanx