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Why can I throw null in Java? [duplicate]
...
why does it upcast it to a NullPointerException?
As per JLS 14.18:
A throw statement first evaluates the Expression. If the evaluation of the Expression completes abruptly for some reason, then the throw completes abruptly for that re...
How to check type of variable in Java?
...he datatype that the variable a was originally declared as or subsequently cast to.
boolean b = a instanceof String - will give you whether or not the actual object referred to by a is an instance of a specific class.
Again, the datatype that the variable a was originally declared as or subsequentl...
How to calculate a time difference in C++
...ow(); }
double elapsed() const {
return std::chrono::duration_cast<second_>
(clock_::now() - beg_).count(); }
private:
typedef std::chrono::high_resolution_clock clock_;
typedef std::chrono::duration<double, std::ratio<1> > second_;
std::chrono...
How do I add the contents of an iterable to a set?
... 150000))
def one_by_one(s, l):
for i in l:
s.add(i)
def cast_to_list_and_back(s, l):
s = set(list(s) + l)
def update_set(s,l):
s.update(l)
results are:
one_by_one 10.184448844986036
cast_to_list_and_back 7.969255169969983
update_set 2.212590195937082
...
MySQL - UPDATE query based on SELECT Query
...UPDATE
receipt_invoices dest,
(
SELECT
`receipt_id`,
CAST((net * 100) / 112 AS DECIMAL (11, 2)) witoutvat
FROM
receipt
WHERE CAST((net * 100) / 112 AS DECIMAL (11, 2)) != total
AND vat_percentage = 12
) src
SET
dest.price = src.witoutvat,
dest.amou...
Create an enum with string values
...ink.LEARN: will get a Cannot convert 'Link.LEARN' to 'string' build error. Casting will not work.
– Gone Coding
Jan 16 '14 at 10:22
...
How is an overloaded method chosen when a parameter is the literal null value?
...ween them? Then you must be explicit regarding which one you want (i.e. by casting your null reference question.method((String)null))
– Edwin Dalorzo
Oct 23 '12 at 15:01
...
SQL variable to hold list of integers
...n need put coma on begin and end
select *
from TabA
where charindex(',' + CAST(TabA.ID as nvarchar(20)) + ',', @listOfIDs) > 0
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How to print a int64_t type in C
..._int = 999999999999999999;
printf("%" PRId64 "\n", my_int);
Or you could cast!
printf("%ld", (long)my_int);
printf("%lld", (long long)my_int); /* C89 didn't define `long long` */
printf("%f", (double)my_int);
If you're stuck with a C89 implementation (notably Visual Studio) you can perhaps use ...
Converting a Uniform Distribution to a Normal Distribution
...er, just add up four of them and divide by 2.
– CrazyCasta
Mar 10 '16 at 2:11
6
I think the sugge...