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Checking if an object is null in C#
...f course you want to use them ...)
For not null use if (obj is object) and from C# 9 you can also use if (obj is not null)
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How to change the text of a button in jQuery?
... wrapped it in a .click() call, of course
EDIT 2 : Newer jQuery versions (from > 1.6) use .prop rather than .attr
EDIT 3 : If you're using jQuery UI, you need to use DaveUK's method (below) of adjusting the text property
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Python: avoid new line with print command [duplicate]
...se the end argument to the print() function to prevent a newline character from being printed:
print("Nope, that is not a two. That is a", end="")
In Python 2.x, you can use a trailing comma:
print "this should be",
print "on the same line"
You don't need this to simply print a variable, thoug...
Why is Dictionary preferred over Hashtable in C#?
...mentation in the .NET Framework is based on the Hashtable, as you can tell from this comment in its source code:
The generic Dictionary was copied from Hashtable's source
Source
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How to use the PI constant in C++
...4159265358979323846 /* pi */
but check your math.h for more. An extract from the "old" math.h (in 2009):
/* Define _USE_MATH_DEFINES before including math.h to expose these macro
* definitions for common math constants. These are placed under an #ifdef
* since these commonly-defined names are...
How to decorate a class?
...l have a particular member. My reasons for not having the classes inherit from a common ID class is that I want to have non-ID versions of the classes as well as ID versions.
– Robert Gowland
Mar 25 '09 at 15:51
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Difference between `constexpr` and `const`
...e use of this fact for optimizations. It also helps prevent the programmer from writing code that modifies objects that were not meant to be modified after initialization.
constexpr declares an object as fit for use in what the Standard calls constant expressions. But note that constexpr is not the...
How to do scanf for single char in C [duplicate]
In C:
I'm trying to get char from the user with scanf and when I run it the program don't wait for the user to type anything...
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Example invalid utf8 string?
... Octet Sequence (but not Unicode!)' => "\xfc\xa1\xa1\xa1\xa1\xa1",
);
From http://www.php.net/manual/en/reference.pcre.pattern.modifiers.php#54805
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Divide a number by 3 without using *, /, +, -, % operators
.../ 3 = a/4 + a/16 + a/64 + (..). Dividing by 4 is where the bit shift comes from. The last check on num==3 is needed because we've only got integers to work with.
– Yorick Sijsling
Jul 30 '12 at 12:40
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