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Cisco Systems Interview Question for Software Engineer / Developers


Country: United States
Interview Type: Phone Interview
More Questions from This Interview



Comment hidden because of low score. Click to expand.
8
of 8 vote

Good question. This is an arithmetic shift and not a logical shift.
-1<<4 = -16.
-16 in 2's compliment is stored as fffffff0.

- anon.coder May 03, 2012 | Flag Reply
Comment hidden because of low score. Click to expand.
0
of 0 votes

can anyone plz elaborate ?

- Anonymous May 03, 2012 | Flag
Comment hidden because of low score. Click to expand.
0
of 0 votes

Since its a negative (signed) number, it is an arithmetic shift. The MSB value remains and does not go away. Read more about arithmetic shift in wikipedia.

-16 in 2's compliment is like this:

16 in binary:
00000000 00000000 00000000 00010000

Flip all the bits now:
11111111 11111111 11111111 11101111

Now add "1" to it.
11111111 11111111 11111111 11110000

which is nothing but fffffff0.
Hope this helps.

- anon.coder May 04, 2012 | Flag
Comment hidden because of low score. Click to expand.
1
of 1 vote

Negative numbers are stored as 2's compliment . Assuming 32 bit integer answer would be
fffffff0.

- Punit Jain May 02, 2012 | Flag Reply
Comment hidden because of low score. Click to expand.
1
of 1 vote

Cisco gives hike once in 2-3 years.

New-Joinees only get hike after 2-3 years, so take 100% hike at the time of joining .. . otherwise don't cry after joining. :)

- Simple April 25, 2014 | Flag Reply


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