大约有 47,000 项符合查询结果(耗时:0.0400秒) [XML]

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How can one print a size_t variable portably using the printf family?

I have a variable of type size_t , and I want to print it using printf() . What format specifier do I use to print it portably? ...
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Why doesn't c++ have &&= or ||= for booleans?

Is there a "very bad thing" that can happen &&= and ||= were used as syntactic sugar for bool foo = foo && bar and bool foo = foo || bar ? ...
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What are dictionary view objects?

...sentially what their name says: views are simply like a window on the keys and values (or items) of a dictionary. Here is an excerpt from the official documentation for Python 3: >>> dishes = {'eggs': 2, 'sausage': 1, 'bacon': 1, 'spam': 500} >>> keys = dishes.keys() >>&gt...
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XAMPP, Apache - Error: Apache shutdown unexpectedly

I've just re-installed XAMPP, and when I try to start my Apache server in the XAMPP Control Panel, I now get the following errors: ...
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How do I compare two strings in Perl?

... See perldoc perlop. Use lt, gt, eq, ne, and cmp as appropriate for string comparisons: Binary eq returns true if the left argument is stringwise equal to the right argument. Binary ne returns true if the left argument is stringwise not equal to the right argument....
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Regex to check whether a string contains only numbers [duplicate]

I get false on both "123" and "123f" . I would like to check if the hash only contains numbers. Did I miss something? 21...
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What are all the uses of an underscore in Scala?

I've taken a look at the list of surveys taken on scala-lang.org and noticed a curious question: " Can you name all the uses of “_”? ". Can you? If yes, please do so here. Explanatory examples are appreciated. ...
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How to convert a String to its equivalent LINQ Expression Tree?

...o you mean by "writing a parser (using Expression under the hood)" Parsing and then generating an expression tree, or does System.Linq.Expressions have some parsing mechanism? – AK_ Jul 1 '13 at 14:51 ...
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nginx missing sites-available directory

I installed Nginx on Centos 6 and I am trying to set up virtual hosts. The problem I am having is that I can't seem to find the /etc/nginx/sites-available directory. ...
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How to run a Runnable thread in Android at defined intervals?

... developed an application to display some text at defined intervals in the Android emulator screen. I am using the Handler class. Here is a snippet from my code: ...