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How does java do modulus calculations with negative numbers?
... This doesn't work good if n is negative. If you user same example from Java 7 Lang Spec (Section 15.17.3): (-5) % (-3) = -2. Adding -3 will not work. You should add absolute value of n if you want to be sure that value is positive.
– partlov
Jul 2 '14 ...
What is the difference between persist() and merge() in JPA and Hibernate?
...peration is
cascaded to entities referenced by X,
if the relationships from X to these
other entities are annotated with the
cascade=PERSIST or cascade=ALL
annotation element value or specified
with the equivalent XML descriptor
element.
If X is a removed entity,
it becomes managed...
Merge (with squash) all changes from another branch as a single commit
In Git, is there a way to merge all changes from one branch into another, but squash to a single commit at the same time?
...
How can I remove a key and its value from an associative array?
...e4");
To remove an element using the array key:
// To unset an element from array using Key:
unset($arr["key2"]);
var_dump($arr);
// output: array(3) { ["key1"]=> string(6) "value1" ["key3"]=> string(6) "value3" ["key4"]=> string(6) "value4" }
To remove element by value:
// remove an ...
How to get the original value of an attribute in Rails
... original value that an ActiveRecord attribute (=the value that was loaded from the database)?
4 Answers
...
Python speed testing - Time Difference - milliseconds
...nWarning: time.clock has been deprecated in Python 3.3 and will be removed from Python 3.8: use time.perf_counter or time.process_time instead.
– Contango
Jul 21 at 20:02
add ...
Why is Cache-Control attribute sent in request header (client to server)?
...
Cache-Control: no-cache is generally used in a request header (sent from web browser to server) to force validation of the resource in the intermediate proxies.
If the client doesn't send this request to the server, intermediate proxies will return a copy of the content if it is fresh (has no...
Difference between malloc and calloc?
...t calloc implementations under mainstream OSes will get known-zeroed pages from the OS (e.g. via POSIX mmap(MAP_ANONYMOUS) or Windows VirtualAlloc) so it doesn't need to write them in user-space. This is how normal malloc gets more pages from the OS as well; calloc just takes advantage of the OS's ...
List of zeros in python [duplicate]
...
$python 2.7.8
from timeit import timeit
import numpy
timeit("list(0 for i in xrange(0, 100000))", number=1000)
> 8.173301935195923
timeit("[0 for i in xrange(0, 100000)]", number=1000)
> 4.881675958633423
timeit("[0] * 100000", nu...
What's wrong with this 1988 C code?
I'm trying to compile this piece of code from the book "The C Programming Language" (K & R). It is a bare-bones version of the UNIX program wc :
...