left shift operator

[rani bedi]

  public static void main(String s[])
  {
System.out.println((8 << -1));
  }

whats the output and how is it calculated..??

[Spike Spiegel]

The output is 0, how it is calculated I dunno!

[Harry Singh]

Hi,
The result of 8 << -1 will be O.
According to JLS, the last five bits of the right hand operand is considered for shift and then mask this value with 0x1f.
Calculating -1
1 ---------------------------------00001
one's complement-------------------11110
Adding 1--------------------------- 1
Twos complment is------------------11111
Now mask this value with 0x1f,which means 11111
11111
11111
--------
11111
----------
So we get the value as 31, so that means 8 needs to be shifted left by 31.
00000000 0000000 00000000 00001000
SO when we will shift it by 31 places, we will only be left with Zeroes..

Hope this helps.
Regards,
Harjinder

[shiva thadakamadla]

But what about -1>>8.
Is there any way, please let me know

[shiva thadakamadla]

But what about -1>>8.
Is there any way, please let me know