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Error to install Nokogiri on OSX 10.9 Maverick?
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30 Answers
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Active
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How do you detect Credit card type based on number?
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+50
The credit/debit card number is referred to as a PAN, or Primary Account Number. The first six digits of the PAN are taken from the I...
How to iterate through two lists in parallel?
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edited Jun 9 '19 at 20:46
Tobias Kolb
9461111 silver badges2626 bronze badges
answered Nov 2 '09 at...
What's the (hidden) cost of Scala's lazy val?
...uivalent to the following Java code:
class LazyTest {
public int bitmap$0;
private String msg;
public String msg() {
if ((bitmap$0 & 1) == 0) {
synchronized (this) {
if ((bitmap$0 & 1) == 0) {
synchronized (this) {
msg = "La...
How do I base64 encode (decode) in C?
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106
Here's the one I'm using:
#include <stdint.h>
#include <stdlib.h>
static char en...
How to find the kth smallest element in the union of two sorted arrays?
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50
You've got it, just keep going! And be careful with the indexes...
To simplify a bit I'll assum...
Fast Bitmap Blur For Android SDK
... I'm looping through the pixels of an image to blur it. This takes about 30 seconds on a 640x480 image.
19 Answers
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How to check if a number is a power of 2
...his problem:
bool IsPowerOfTwo(ulong x)
{
return (x & (x - 1)) == 0;
}
Note, this function will report true for 0, which is not a power of 2. If you want to exclude that, here's how:
bool IsPowerOfTwo(ulong x)
{
return (x != 0) && ((x & (x - 1)) == 0);
}
Explanation
Fi...
Why does the expression 0 < 0 == 0 return False in Python?
... make range comparisons easy to express. It's much nicer to be able to say 0 < x <= 5 than to say (0 < x) and (x <= 5).
These are called chained comparisons. And that's a link to the documentation for them.
With the other cases you talk about, the parenthesis force one relational opera...
initialize a numpy array
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answered Dec 26 '10 at 20:56
KatrielKatriel
102k1717 gold badges120120 silver badges157157 bronze badges
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