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The most efficient way to implement an integer based power function pow(int, int)
What is the most efficient way given to raise an integer to the power of another integer in C?
17 Answers
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C/C++ check if one bit is set in, i.e. int variable
... from the right end:
CHECK_BIT(temp, n - 1)
In C++, you can use std::bitset.
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Extracting the last n characters from a string in R
...ub('.*(?=.{3}$)', '', string, perl=T)
for three characters, etc. You can set the number of characters to grab with a variable, but you'll have to paste the variable value into the regular expression string:
n = 3
sub(paste('.+(?=.{', n, '})', sep=''), '', string, perl=T)
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How to install latest version of Node using Brew
...n do 'brew info node' to find out what version it's going to install. It's set to 0.4.0 so I ended up installing from src anyway, but this is right. Thank you.
– PandaWood
Feb 20 '11 at 12:12
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jQuery: more than one handler for same event
... Note that for jQueryUI widgetfactory widgets, this isn't true if you set the handler as an option. For both the old and new handler to be called, you need to use the bind method. See this for details: learn.jquery.com/jquery-ui/widget-factory/…
– Michael Scheper
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What's the best way to do a backwards loop in C/C#/C++?
...alues are defined by means of modulo their count of bits. Thus, if you are setting -N, you end up at (2 ^ BIT_SIZE) -N
Using Arrays
Using iterators
We are using std::reverse_iterator to do the iterating.
for(std::reverse_iterator<element_type*> it(a + sizeof a / sizeof *a), itb(a);
it...
Check if character is number?
I need to check whether justPrices[i].substr(commapos+2,1) .
22 Answers
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Is there a reason that Swift array assignment is inconsistent (neither a reference nor a deep copy)?
...tion of the Swift language:
Note that the array is not copied when you set a new value with subscript syntax, because setting a single value with subscript syntax does not have the potential to change the array’s length. However, if you append a new item to array, you do modify the array’s l...
How to get the part of a file after the first line that matches a regular expression?
...d=0} /TERMINATE/{found=1} {if (found) print }'
How does this work:
We set the variable 'found' to zero, evaluating false
if a match for 'TERMINATE' is found with the regular expression, we set it to one.
If our 'found' variable evaluates to True, print :)
The other solutions might consume a ...
What is more efficient? Using pow to square or just multiply it with itself?
...nce errno is a global, thread safety requires that it call pow to possibly set errno multiple times... exp=1 and exp=2 are fast because the pow call is hoisted out of the loop with just -O3.. (with -ffast-math, it does the sum-of-8 outside the loop, too.)
– Peter Cordes
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