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“Notice: Undefined variable”, “Notice: Undefined index”, and “Notice: Undefined offset” using PHP
...sed to detect if a variable has been already initialized. Additionally and more ideal is the solution of empty() since it does not generate a warning or error message if the variable is not initialized.
From PHP documentation:
No warning is generated if the variable does not exist. That means...
Unix command to find lines common in two files
...I once found a unix command which could print the common lines from two or more files, does anyone know its name? It was much simpler than diff .
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Options, Settings, Properties, Configuration, Preferences — when and why?
...ferences: "Tell us how you prefer this to work"
Properties: "Change one or more properties of this item"
Edit: "This thing is already in a good state, but you can change it if you like"
Configuration: "We have defaults, but they're so barebones you probably want to configure it yourself"
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custom listview adapter getView method being called multiple times, and in no coherent order
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How to remove EXIF data without recompressing the JPEG?
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How to use enum values in f:selectItem(s)
...an select a status on my question. Is it possible to make the f:selectItem more flexible considering what happens if the order of the enums changes, and if the list was large? And could I do this better? And is it possible to automatically "select" the item that the question have?
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How to calculate moving average using NumPy?
... the upvotes, I am guessing the general idea behind the answer was weighed more heavily than an off-by-one error in the implementation, but who knows.
– Jaime
Aug 22 '13 at 19:33
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What characters are forbidden in Windows and Linux directory names?
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The purpose of Model View Projection Matrix
...in Android using this Model View Projection Matrix if Possible. I refereed more links, i could not get any clear idea.if any sample code means, its easy to understand for me..
– harikrishnan
Jun 28 '13 at 13:29
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How can I check if multiplying two numbers in Java will cause an overflow?
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}
If you need to deal with both positive and negative numbers then it's more complicated:
long maximum = Long.signum(a) == Long.signum(b) ? Long.MAX_VALUE : Long.MIN_VALUE;
if (a != 0 && (b > 0 && b > maximum / a ||
b < 0 && b < maximum / a))
{...