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How do you set, clear, and toggle a single bit?
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Setting a bit
Use the bitwise OR operator (|) to set a bit.
number |= 1UL << n;
That will set the nth bit of number. n should be zero, if you want to set the 1st bit and so on upto n-1, if you want to set the nth bit.
Use 1ULL if number is wider than unsigned long; promotion of 1UL <&...
How to concatenate twice with the C preprocessor and expand a macro as in “arg ## _ ## MACRO”?
...EVALUATOR(fun, VARIABLE)
extern void NAME(mine)(char *x);
$ gcc -E xx.c
# 1 "xx.c"
# 1 "<built-in>"
# 1 "<command-line>"
# 1 "xx.c"
extern void mine_3(char *x);
$
Two levels of indirection
In a comment to another answer, Cade Roux asked why this needs two levels of indirection. ...
Transpose/Unzip Function (inverse of zip)?
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12 Answers
12
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MySQL ON vs USING?
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415
It is mostly syntactic sugar, but a couple differences are noteworthy:
ON is the more general ...
How can I get the current network interface throughput statistics on Linux/UNIX? [closed]
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15 Answers
15
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Select values from XML field in SQL Server 2008
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159
Given that the XML field is named 'xmlField'...
SELECT
[xmlField].value('(/person//firstName...
How do I compute derivative using Numpy?
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143
You have four options
Finite Differences
Automatic Derivatives
Symbolic Differentiation
Com...