# Confusing shift operators.

Harry Singh

Ranch Hand

Posts: 124

posted 13 years ago

Hi,

What will be the result of

1<<32....and why is it equal to 1>>32 or 1>>>32.

As per my understanding, the bits will be shifted left and after 31 shifts the number will be reduced to zero as then it will be filled with zeros from right. Am i right?

In what conditions can unsigned right shift operator produce negative values?

What will be the result of

1<<32....and why is it equal to 1>>32 or 1>>>32.

As per my understanding, the bits will be shifted left and after 31 shifts the number will be reduced to zero as then it will be filled with zeros from right. Am i right?

In what conditions can unsigned right shift operator produce negative values?

Prem Kumar

Greenhorn

Posts: 29

posted 13 years ago

1 << 32 The left shift (<< shifts all bits to the left, filling the right side with zeroes,

1>>32 right shift (>> shifts all bits right, filling in the left side with whatever the sign bit was.

OR

1>>>32 The unsigned right shift (>>> moves all bits to the right, but fills the left side with zeroes,

Regards

PREM

1>>32 right shift (>> shifts all bits right, filling in the left side with whatever the sign bit was.

OR

1>>>32 The unsigned right shift (>>> moves all bits to the right, but fills the left side with zeroes,

Regards

PREM

Uma Balu

Ranch Hand

Posts: 61

posted 13 years ago

Hi,

I think shifting the bits by 32 places, either left or right will result in the same number. Since, shift by number greater than or equal to 32 will always be a modulo of 32. That is, 1>>32 will be 1>>0 (1 >> (32%32)) , resulting in 1 itself.

Is my assumption right??

Thanks,

Uma...

I think shifting the bits by 32 places, either left or right will result in the same number. Since, shift by number greater than or equal to 32 will always be a modulo of 32. That is, 1>>32 will be 1>>0 (1 >> (32%32)) , resulting in 1 itself.

Is my assumption right??

Thanks,

Uma...

Arun Subbu

Greenhorn

Posts: 25

posted 13 years ago

Hi Uma,

you are right but you didnt give him the complete picture.

Hi Harjinder,

in case of integers, it works like this:

opr1>>opr2 where opr2 = (opr2%32) if opr2 >= 32. for both left shift and right shift.

in case of long, it works like this:

opr1>>opr2 where opr2 = (opr2%64) if opr2 >= 64. for both left shift andirght shift.

now just think about short and try out how it works for a short?

you are right but you didnt give him the complete picture.

Hi Harjinder,

in case of integers, it works like this:

opr1>>opr2 where opr2 = (opr2%32) if opr2 >= 32. for both left shift and right shift.

in case of long, it works like this:

opr1>>opr2 where opr2 = (opr2%64) if opr2 >= 64. for both left shift andirght shift.

now just think about short and try out how it works for a short?

Alton Hernandez

Ranch Hand

Posts: 443