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Adding two numbers concatenates them instead of calculating the sum
...hey are actually strings, not numbers. The easiest way to produce a number from a string is to prepend it with +:
var x = +y + +z;
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What is the difference between a “line feed” and a “carriage return”?
...as \r\n in text files. Unix uses mostly only the \n.
The separation comes from typewriter times, when you turned the wheel to move the paper to change the line and moved the carriage to restart typing on the beginning of a line. This was two steps.
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How can I get the MAC and the IP address of a connected client in PHP?
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Server IP
You can get the server IP address from $_SERVER['SERVER_ADDR'].
Server MAC address
For the MAC address, you could parse the output of netstat -ie in Linux, or ipconfig /all in Windows.
Client IP address
You can get the client IP from $_SERVER['REMOTE_ADD...
Saving a Numpy array as an image
...An answer using PIL (just in case it's useful).
given a numpy array "A":
from PIL import Image
im = Image.fromarray(A)
im.save("your_file.jpeg")
you can replace "jpeg" with almost any format you want. More details about the formats here
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Java recursive Fibonacci sequence
...fibonacci(3) = 1+1 = 2
fibonacci(4) = 2+1 = 3
fibonacci(5) = 3+2 = 5
And from fibonacci sequence 0,1,1,2,3,5,8,13,21.... we can see that for 5th element the fibonacci sequence returns 5.
See here for Recursion Tutorial.
s...
Script parameters in Bash
...self.
The arguments are seperated by spaces, so if you would provide the -from and -to in the command, they will end up in these variables too, so for this:
./ocrscript.sh -from /home/kristoffer/test.png -to /home/kristoffer/test.txt
You'll get:
$0 # ocrscript.sh
$1 # -from
$2 # /home/...
How to remove an element from an array in Swift
How can I unset/remove an element from an array in Apple's new language Swift?
18 Answers
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Hashing a string with Sha256
...ta you're hashing. Hashing the two bytes "Hi" will give a different result from hashing the three bytes "Hi". You'll have to decide which you want to do. (Presumably you want to do whichever one your friend's PHP code is doing.)
For ASCII text, Encoding.UTF8 will definitely be suitable. If you're a...
What is the difference between a definition and a declaration?
...oming up (in answers and comments to other questions) , I'll paste a quote from the C++ standard here.
At 3.1/2, C++03 says:
A declaration is a definition unless it [...] is a class name declaration [...].
3.1/3 then gives a few examples. Amongst them:
[Example: [...]
struct S { int a; int b...
What's the most efficient test of whether a PHP string ends with another string?
... I ran into a bug today which will break the solution that you have given from PHP 5.5.11 and onwards. bugs.php.net/bug.php?id=67043
– user2180613
Jul 29 '14 at 21:18
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