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~x + ~y == ~(x + y) is always false?
...d some y (mod 2n) such that
~(x+y) == ~x + ~y
By two's complement*, we know that,
-x == ~x + 1
<==> -1 == ~x + x
Noting this result, we have,
~(x+y) == ~x + ~y
<==> ~(x+y) + (x+y) == ~x + ~y + (x+y)
<==> ~(x+y) + (x+y) == (~x + x) + (~y + y)
<==> ~(x+y)...
Writing a compiler in its own language
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@robru I don't know about K&R's process, I'm sure this wasn't the case for it, but theoretically, the source could compile itself from the very beginning. And as long as you have something or someone who can correctly execute the program...
Can't start Eclipse - Java was started but returned exit code=13
... will find Java. Click on it and you will find all the different versions. Now you can select which one to uninstall.
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Deleting queues in RabbitMQ
I have a few queues running with RabbitMQ. A few of them are of no use now, how can I delete them? Unfortunately I had not set the auto_delete option.
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python date of the previous month
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you could use .replace() method: datetime.utcnow().replace(day=1) - timedelta(days=1)
– jfs
Mar 16 '12 at 6:43
1
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What's the best way to retry an AJAX request on failure using jQuery?
... return settings => $oldAjax(settings).always(check)
})($.ajax);
// now we can use the "retries" property if we need to retry on fail
$.ajax({
type : 'GET',
url : 'http://www.whatever123.gov',
timeout : 2000,
retries : 3, // <-------...
PSQLException: current transaction is aborted, commands ignored until end of transaction block
...tarted using Postgres... it's really annoying that Postgres does this, and now we have to be really rewrite a big bulk of our program that we are porting from Oracle to Postgres. Why isn't there an option like the first to make it behave like Oracle but without the auto-commit?
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How to get an element's top position relative to the browser's viewport?
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The existing answers are now outdated. The native getBoundingClientRect() method has been around for quite a while now, and does exactly what the question asks for. Plus it is supported across all browsers (including IE 5, it seems!)
From MDN page:
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Iterate over object attributes in python
...ppens if I just harmlessly add an attribute to the class, a name, say, and now all of a sudden it gets included.
– Julian
Jul 24 '12 at 19:16
3
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PowerShell: Run command from script's directory
... to the correct folder
Push-Location $folder
# do stuff, call ant, etc
# now back to previous directory
Pop-Location
There's probably other ways of achieving something similar using Invoke-Command as well.
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