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Subject Author Date
What is << ? mab464 07-14-2008
| | ---> Re: What is << ? The Natural Phi...07-16-2008
| | `--> Re: What is << ? The Natural Phi...07-16-2008
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Posted by mab464 on July 14, 2008, 6:13 am
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 I was taking an online PHP test and got the question

What will the output of the following statement be

echo 4<<5;

After the test, I searched google but couldn't find any such
operator/construct.
Can any one explain what '<<' does?

Thanks


Posted by Jensen Somers on July 14, 2008, 5:41 am
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 Hello,

mab464 wrote:
> I was taking an online PHP test and got the question
>
> What will the output of the following statement be
>
> echo 4<<5;
>
> After the test, I searched google but couldn't find any such
> operator/construct.
> Can any one explain what '<<' does?
>
> Thanks

That's a bitwise operation.

You can find more information about bitwise operations at
http://be.php.net/language.operators.bitwise.

- Jensen

Posted by sathyashrayan on July 14, 2008, 5:43 am
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>I was taking an online PHP test and got the question
>
> What will the output of the following statement be
>
> echo 4<<5;
>
> After the test, I searched google but couldn't find any such
> operator/construct.
> Can any one explain what '<<' does?
>
> Thanks

search for "computer number system" in google, then search for base 2
numbers.Then come to bit operators.



Posted by Tim Roberts on July 16, 2008, 2:24 am
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>
>>I was taking an online PHP test and got the question
>>
>> What will the output of the following statement be
>>
>> echo 4<<5;
>>
>> After the test, I searched google but couldn't find any such
>> operator/construct.
>> Can any one explain what '<<' does?
>
>search for "computer number system" in google, then search for base 2
>numbers.Then come to bit operators.

I find that to be odd advice. I'm very much in favor of "Google it" as a
first-stage answer, but your search terms would imply that the << operator
is a generic part of binary arithmetic. That's not true. The << operator
was a C language invention, and in order to learn that "<<" is the "left
shift operator", you have to stumble upon a reference for a programming
language that implements it.
--
Tim Roberts, timr@probo.com
Providenza & Boekelheide, Inc.

Posted by sathyashrayan on July 16, 2008, 2:53 am
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>>
>>>I was taking an online PHP test and got the question
>>>
>>> What will the output of the following statement be
>>>
>>> echo 4<<5;
>>>
>>> After the test, I searched google but couldn't find any such
>>> operator/construct.
>>> Can any one explain what '<<' does?
>>
>>search for "computer number system" in google, then search for base 2
>>numbers.Then come to bit operators.
>
> I find that to be odd advice. I'm very much in favor of "Google it" as a
> first-stage answer, but your search terms would imply that the << operator
> is a generic part of binary arithmetic. That's not true. The << operator
> was a C language invention, and in order to learn that "<<" is the "left
> shift operator", you have to stumble upon a reference for a programming
> language that implements it.

opps.. got it.. you are correct.. Boolean logic never talks about shifts.
Shifts are Register specific..
Correct me if i am wrong..




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