大约有 35,800 项符合查询结果（耗时：0.0470秒） [XML]
Handling Touch Event in UILabel and hooking it up to an IBAction
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Scott PersingerScott Persinger
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Mod of negative number is melting my brain
...ould write it as
int mod(int x, int m) {
int r = x%m;
return r<0 ? r+m : r;
}
or variants thereof.
The reason it works is that "x%m" is always in the range [-m+1, m-1]. So if at all it is negative, adding m to it will put it in the positive range without changing its value modulo m.
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Guards vs. if-then-else vs. cases in Haskell
...and guards should almost always be used instead.
let absOfN =
if n < 0 -- Single binary expression
then -n
else n
Every if..then..else expression can be replaced by a guard if it is at the top level of a function, and this should generally be preferred, since you can add more cases more...
inserting characters at the start and end of a string
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answered Apr 8 '12 at 0:47
Mark ByersMark Byers
683k155155 gold badges14681468 silver badges13881388 bronze badges
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How do I rename all files to lowercase?
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answered Oct 16 '11 at 20:39
wjlwjl
6,29011 gold badge2828 silver badges4646 bronze badges
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Dictionaries and default values
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edited Jan 23 '19 at 5:30
Solomon Ucko
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answere...
How to change column datatype from character to numeric in PostgreSQL 8.4
...nding on your data):
alter table presales alter column code type numeric(10,0) using code::numeric;
-- Or if you prefer standard casting...
alter table presales alter column code type numeric(10,0) using cast(code as numeric);
This will fail if you have anything in code that cannot be cast to num...
typecast string to integer - Postgres
...lesced field such as, for example:-
SELECT CAST(coalesce(<column>, '0') AS integer) as new_field
from <table>
where CAST(coalesce(<column>, '0') AS integer) >= 10;
share
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im...
Java regular expression OR operator
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edited Jan 9 '10 at 0:57
answered Jan 9 '10 at 0:46
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Upload file to FTP using C#
...ernatives
– Pacharrin
Apr 16 '19 at 0:29
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