bit shiftting pblm

[sunitha thejaswi]

please expalin me how to slove following pblm

-4 >> 34

-4 >>> -34

thanks in advance
sunitha

[Enge Chall]

It goes like this :
If you have a +ve number and every time you shift rightgives you a number equivalent to integer division by 2.
ie 4 >> 1 gives(4/2)ie 2, 4 >> 2 gives(4/4) ie 1.

if you do it 32 times right shift gives you the same number ie 4.
ie any multiple of 32(0, 32, 64, 128) also gives you the same number ie 4.

Any number(say n ) above 32, 64, 128..... times shifting gives you (n-32) times right shift.

So 33 means shift (33-32) ie 1. equivalent 4 >> 33 is 4 >> 1.
So 34 means shift (34-32) ie 2. equivalent 4 >> 34 is 4 >> 2.

Simillarly in case of -ve numbers, the sign bit is always 1 and it is stored as 2's complement form.

So shifting more than 2 times -4 ( ie -4 >> 3 ) gives you -1(not zero). other rules being same.
ie -4 >> 32 = -4
-4 >> 64 = -4
-4 >> 33 is -4 >> 1 = -2

not sure about >>> ???

[Niranjan Deshpande]

does the exam expects shifting such weird integers

[Jan Valenta]

Originally posted by Niranjan Deshpande:
does the exam expects shifting such weird integers

AFAIK there is no shifting in 5.0. In 1.4 you probably may meet such stuff.