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Test if number is odd or even
... most basic way to find out if a number/variable is odd or even in PHP?
Is it something to do with mod?
17 Answers
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How to check whether a given string is valid JSON in Java
How do I validate a JSON string in Java? Or could I parse it using regular expressions?
19 Answers
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PHP validation/regex for URL
...for URLs, does anybody have one handy that works well? I didn't find one with the zend framework validation classes and have seen several implementations.
...
What's the best practice for putting multiple projects in a git repository? [closed]
As some reason, I only have one repository to use.
But I have multiple projects including java projects, php scripts and Android apps projects.
...
How to convert date to timestamp?
...
Split the string into its parts and provide them directly to the Date constructor:
Update:
var myDate = "26-02-2012";
myDate = myDate.split("-");
var newDate = new Date( myDate[2], myDate[1] - 1, myDate[0]);
console.log(newD...
Reason for Column is invalid in the select list because it is not contained in either an aggregate f
...uld the value of b show on each of these two rows? There are three possibilities in each case, and nothing in the query makes it clear which value to choose for b in each group. It's ambiguous.
This demonstrates the single-value rule, which prohibits the undefined results you get when you run a GRO...
Find when a file was deleted in Git
I have a Git repository with n commits.
6 Answers
6
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Differences between Exception and Error
...ions are the bread and butter of exception handling. The Javadoc explains it well:
An Error is a subclass of Throwable that indicates serious problems that a
reasonable application should not try to catch. Most such errors are abnormal
conditions.
Look at a few of the subclasses of Error,...
difference between primary key and unique key
...
Primary Key:
There can only be one primary key in a table
In some DBMS it cannot be NULL - e.g. MySQL adds NOT NULL
Primary Key is a unique key identifier of the record
Unique Key:
Can be more than one unique key in one table
Unique key can have NULL values
It can be a candidate key
Unique k...
Swapping two variable value without using third variable
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Using the xor swap algorithm
void xorSwap (int* x, int* y) {
if (x != y) { //ensure that memory locations are different
*x ^= *y;
*y ^= *x;
*x ^= *y;
}
}
Why the test?
The test is to ensure that x and y have diffe...