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Best practices for circular shift (rotate) operations in C++
...n-circular shifts work on that target.
Current x86 compilers still use an extra instruction to mask a variable count for 8 and 16-bit rotates, probably for the same reason they don't avoid the AND on ARM. This is a missed optimization, because performance doesn't depend on the rotate count on any ...
ssh: Could not resolve hostname [hostname]: nodename nor servname provided, or not known
...I had already:
installed and tested ssh on my home network.
Set a static IP for my pi.
Set up a Dynamic DNS service and installed the software on my pi.
I referenced these instructions for setting up the static ip, and there are many more instructional resources out there.
Also, I set up port f...
What is the best way to test for an empty string in Go?
Which method is best (more idomatic) for testing non-empty strings (in Go)?
10 Answers
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java.net.ConnectException: Connection refused
...
This exception means that there is no service listening on the IP/port you are trying to connect to:
You are trying to connect to the wrong IP/Host or port.
You have not started your server.
Your server is not listening for connections.
On Windows servers, the listen backlog queue is f...
AES Encryption for an NSString on the iPhone
Can anybody point me in the right direction to be able to encrypt a string, returning another string with the encrypted data? (I've been trying with AES256 encryption.) I want to write a method which takes two NSString instances, one being the message to encrypt and the other being a 'passcode' to e...
Command line progress bar in Java
...he thing to do is to print your progress bar, for example, by printing the string
"|======== |\r"
On the next tick of the progress bar, overwrite the same line with a longer bar. (because we are using \r, we stay on the same line) For example:
"|========= |\r"
What you have to re...
Linux command to translate DomainName to IP [closed]
Is there any Linux command to translate domain name to IP?
2 Answers
2
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Practical uses of different data structures [closed]
...they have a continuous memory for them: boolean, char, int, float, double, string.
composite data structures are data structures that are composed of more than one primitive data types.class, structure, union, array/record.
abstract datatypes are composite datatypes that have way to access them effi...
Checking network connection
...or as err:
return False
Currently, 216.58.192.142 is one of the IP addresses for google.com. Change http://216.58.192.142 to whatever site can be expected to respond quickly.
This fixed IP will not map to google.com forever. So this code is
not robust -- it will need constant maintenanc...
XAMPP, Apache - Error: Apache shutdown unexpectedly
...and solved it by making sure that each directory specified in /apache/conf/extras/httpd-bhosts.conf were actual paths.
– Matthew
Mar 20 '15 at 23:43
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