大约有 13,000 项符合查询结果（耗时：0.0281秒） [XML]
std::string to float or double
...e temp = winOpacity.toDouble();
Extra note:
If the input data is a const char*, QByteArray::toDouble will be faster.
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Colorizing text in the console with C++
...out << k << " I want to be nice today!" << endl;
}
Character Attributes
Here is how the "k" value be interpreted.
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What do the following phrases mean in C++: zero-, default- and value-initialization?
...) {}; ~C(); int m; }; // non-POD, default-initialising m
int main()
{
char buf[sizeof(B)];
std::memset( buf, 0x5a, sizeof( buf));
// use placement new on the memset'ed buffer to make sure
// if we see a zero result it's due to an explicit
// value initialization
B* pB =...
maxlength ignored for input type=“number” in Chrome
...rch, password, tel, or url, this attribute specifies the maximum number of characters (in Unicode code points) that the user can enter; for other control types, it is ignored.
So maxlength is ignored on <input type="number"> by design.
Depending on your needs, you can use the min and max at...
Is there a __CLASS__ macro in C++?
...
That's better. As for knowing the class, defining char array sounds better than postponing it till runtime.
– Michael Krelin - hacker
Nov 3 '09 at 12:21
5
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Is there a limit on how much JSON can hold?
...
It may be worth noting that the "default is 2097152 characters, which is equivalent to 4 MB of Unicode string data" for the property JavaScriptSerializer.MaxJsonLength mentioned in Amber's answer. (N.B. I have quoted from MSDN)
– dumbledad
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How do I check if a variable exists in a list in BASH
... give false positive if the user input contains regular expression special characters, for example x=.
– glenn jackman
Nov 9 '11 at 11:41
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Read and parse a Json File in C#
... Additionally, it checks whether the path elements to combine have invalid chars.
See https://stackoverflow.com/a/32071002/4420355
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Why is sizeof considered an operator?
...operator rather than a function. For instance:
union foo {
int i;
char c[sizeof(int)];
};
Syntactically if it weren't an operator then it would have to be a preprocessor macro since functions can't take types as arguments. That would be a difficult macro to implement since sizeof can take...
Java String to SHA1
...
Using Guava Hashing class:
Hashing.sha1().hashString( "password", Charsets.UTF_8 ).toString()
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