大约有 13,913 项符合查询结果（耗时：0.0324秒） [XML]
What happens to a declared, uninitialized variable in C? Does it have a value?
...ic variables (file scope and function static) are initialized to zero:
int x; // zero
int y = 0; // also zero
void foo() {
static int x; // also zero
}
Non-static variables (local variables) are indeterminate. Reading them prior to assigning a value results in undefined behavior.
void foo() {
...
Regex group capture in R with multiple capture-groups
In R, is it possible to extract group capture from a regular expression match? As far as I can tell, none of grep , grepl , regexpr , gregexpr , sub , or gsub return the group captures.
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What happens if I define a 0-size array in C/C++?
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An array cannot have zero size.
ISO 9899:2011 6.7.6.2:
If the expression is a constant expression, it shall have a value greater than zero.
The above text is true both for a plain array (paragraph 1). For a VLA (variable length array), the behavior is undefined if the expression's valu...
How would you do a “not in” query with LINQ?
... need to get a list of the items in the first list where Email does not exist in the second list. With SQL I would just use "not in", but I do not know the equivalent in LINQ. How is that done?
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Why is unsigned integer overflow defined behavior but signed integer overflow isn't?
...ed integer overflow is well defined by both the C and C++ standards. For example, the C99 standard ( §6.2.5/9 ) states
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How can I pass arguments to a batch file?
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Another useful tip is to use %* to mean "all". For example:
echo off
set arg1=%1
set arg2=%2
shift
shift
fake-command /u %arg1% /p %arg2% %*
When you run:
test-command admin password foo bar
the above batch file will run:
fake-command /u admin /p password admin password...
No line-break after a hyphen
...
You could also wrap the relevant text with
<span style="white-space: nowrap;"></span>
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What to do Regular expression pattern doesn't match anywhere in string?
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Contrary to all the answers here, for what you're trying to do regex is a perfectly valid solution. This is because you are NOT trying to match balanced tags-- THAT would be impossible with regex! But you are only matching what's in one tag, and that's perfectly regular.
Here's the problem,...
How to extract extension from filename string in Javascript? [duplicate]
how would i get the File extension of the file in a variable?
like if I have a file as 1.txt I need the txt part of it.
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Python: fastest way to create a list of n lists
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The probably only way which is marginally faster than
d = [[] for x in xrange(n)]
is
from itertools import repeat
d = [[] for i in repeat(None, n)]
It does not have to create a new int object in every iteration and is about 15 % faster on my machine.
Edit: Using NumPy, you can avoid t...