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How to print color in console using System.out.println?
... can use ANSI escape codes to use color in your output. It generally works for Unix shell prompts; however, it doesn't work for Windows Command Prompt (Although, it does work for Cygwin). For example, you could define constants like these for the colors:
public static final String ANSI_RESET = "\u0...
Avoid trailing zeroes in printf()
I keep stumbling on the format specifiers for the printf() family of functions. What I want is to be able to print a double (or float) with a maximum given number of digits after the decimal point. If I use:
...
How to return only the Date from a SQL Server DateTime datatype
...an do the following:
SELECT DATEADD(dd, 0, DATEDIFF(dd, 0, @your_date))
for example
SELECT DATEADD(dd, 0, DATEDIFF(dd, 0, GETDATE()))
gives me
2008-09-22 00:00:00.000
Pros:
No varchar<->datetime conversions required
No need to think about locale
As suggested by Michael
Use ...
Should one use < or
... something 1-based (e.g. JDBC, IIRC) I might be tempted to use <=. So:
for (int i=0; i < count; i++) // For 0-based APIs
for (int i=1; i <= count; i++) // For 1-based APIs
I would expect the performance difference to be insignificantly small in real-world code.
...
Is 'float a = 3.0;' a correct statement?
...0 : if you do, the compiler will convert the double literal 3.0 to a float for you.
However, you should use the float literals notation in specific scenarios.
For performance reasons:
Specifically, consider:
float foo(float x) { return x * 0.42; }
Here the compiler will emit a conversion (t...
How can I check which version of Angular I'm using?
...nswer was written, there was only AngularJS 1.x. Look in the answers below for Angular versions >= 2.
AngularJS does not have a command line tool.
You can get the version number from the JavaScript file itself.
Header of the current angular.js:
/**
* @license AngularJS v1.0.6
* (c) 2010-20...
How do I cast a string to integer and have 0 in case of error in the cast with PostgreSQL?
...at as Matthew's answer is, I just needed a quick and dirty way of handling for checking some data. I also admit that my own knowledge is lacking right now in defining functions in SQL. I was only interested in numbers between 1 and 5 digits, so I changed the regex to E'\\d{1,5}$'.
...
Is it safe to check floating point values for equality to 0?
...ood idea to write a little helper function or extension method in .NET 3.5 for comparing:
public static bool AlmostEquals(this double double1, double double2, double precision)
{
return (Math.Abs(double1 - double2) <= precision);
}
This could be used the following way:
double d1 = 10.0 * ...
How do I create a list of random numbers without duplicates?
... the file once and then select random lines from the saved list in memory. For example:
all_lines = f1.readlines()
for i in range(50):
lines = random.sample(all_lines, 40)
This way, you only need to actually read from the file once, before your loop. It's much more efficient to do this than t...
How do I create a dictionary with keys from a list and values defaulting to (say) zero? [duplicate]
...
dict((el,0) for el in a) will work well.
Python 2.7 and above also support dict comprehensions. That syntax is {el:0 for el in a}.
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