Shift operators

[Mathangi Shankar]

Hello,

I am unable to understand the output of the following code:

class EBH019 {
public static void main (String args[]) {
int i1 = 0xffffffff, i2 = i1 << 1;
int i3 = i1 >> 1, i4 = i1 >>> 1;
System.out.print(Integer.toHexString(i2) + ",");
System.out.print(Integer.toHexString(i3) + ",");
System.out.print(Integer.toHexString(i4));
}}

Output:

fffffffe,ffffffff,7fffffff

can anyone provide me the sequence of steps as to know how this output is generated?

Regards,

Mathangi.

[Sona Makheeja]

These are the octal numbers, they are converted into binary andd then left or right shifted and the results are converted back in hex 0x.

Try removing the Integer.toHexString statements and you get the integer values .

[Mathangi Shankar]

hI,

The given number that is 0xffffffff is hexadecimal number. I really do not know to convert hexadecimal number to binary.

If that part of help is provided I would continue doing the left shift and right shift.

Thanks,

Waiting for reply.

[Barry Gaunt]

"coolMats" and "GeetaL" please read our JavaRanch Naming Policy and change your displayed names accordingly.

Thanks
-Barry

(Hopefully two birdies with one stone...)

[Barry Gaunt]

Each hexadecimal digit represents four bits.

0  0000
1  0001
2  0010
.
.
. 
d  1101
e  1110
f  1111
 
 

So 0x7ffffff is "0111 1111 1111 1111 1111 1111 1111 1111"

[ November 03, 2004: Message edited by: Barry Gaunt ]
[ November 03, 2004: Message edited by: Barry Gaunt ]

[Mathangi Shankar]

Thanks a lot I have understood the output.

------------

Mathangi.