大约有 3,516 项符合查询结果（耗时：0.0236秒） [XML]
Why do I get a warning every time I use malloc?
...ry non-toy-program should include it either way because it provides a wide range of useful C standard library functions and macros)
You could also #include <malloc.h> instead.
But please note that the use of malloc.h is deprecated and it makes your code non-portable. If you want to use mallo...
Example invalid utf8 string?
...xA4\xAD\xA2"."\xF0\xA4\xAD\xA2"."\xF0\xA4\xAD"
The oversimplification of range of trailing bytes([0x80, 0xBF]) can be seen in the various libraries.
// U+0800 - U+0FFF
\xE0\x80\x80
// U+D000 - U+D7FF
\xED\xBF\xBF
// U+10000 - U+3FFFF
\xF0\x80\x80\x80
// U+100000 - U+10FFFF
\xF4\xBF\xBF\xBF
...
Why can't I define a default constructor for a struct in .NET?
...proach is not especial casing but its using offset which will work for all ranges.
example with enums as field.
public struct Difficaulty
{
Easy,
Medium,
Hard
}
public struct Level
{
const Difficaulty DefaultLevel = Difficaulty.Medium;
private Difficaulty _level; // this field...
Pandas every nth row
...t involves directly invoking df.__getitem__.
df = pd.DataFrame('x', index=range(5), columns=list('abc'))
df
a b c
0 x x x
1 x x x
2 x x x
3 x x x
4 x x x
For example, to get every 2 rows, you can do
df[::2]
a b c
0 x x x
2 x x x
4 x x x
There's also Grou...
UTF-8, UTF-16, and UTF-32
...
@Urkle is technically correct because mapping the full range of UTF32/LE/BE includes U-00200000 - U-7FFFFFFF even though Unicode v6.3 ends at U-0010FFFF inclusive. Here's a nice breakdown of how to enc/dec 5 and 6 byte utf8: lists.gnu.org/archive/html/help-flex/2005-01/msg00030.h...
How do I match any character across multiple lines in a regular expression?
...opped using (?-s). A modified group can be used to only affect a specified range of a regex pattern (e.g. Delim1(?s:.*?)\nDelim2.* will make the first .*? match across newlines and the second .* will only match the rest of the line).
POSIX note:
In non-POSIX regex engines, to match any char, [\s\S...
How to make child process die after parent exits?
...death signal of the calling process to arg2 (either a signal value in the range 1..maxsig, or 0 to clear). This is the signal that the calling process will get when its parent dies. This value is cleared for the child of a fork(2) and (since Linux 2.4.36 / 2.6.23) when executing a set-use...
Best way to reverse a string
... a pretty rare case to use UTF-32. And XOR is only faster for a very small range of values, the correct answer would be to implement different methods for different lengths I suppose. But this is clear and concise which is a benefit in my opinion.
– PeteT
Dec 8...
Why does 0.ToString(“#.##”) return an empty string instead of 0.00 or at least 0?
...decimal point and the rightmost '0' after the decimal point determines the range of digits that are always present in the result string.
The "00" specifier causes the value to be rounded to the nearest digit preceding the decimal, where rounding away from zero is always used. For example, formatti...
Python 3.x rounding behavior
...ng == None:
rounding = ROUND_HALF_UP
place = '1.'
for i in range(places):
place = ''.join([place, '0'])
return dec(number).quantize(dec(place), rounding=rounding)
Hope this helps,
Narnie
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