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Base64: What is the worst possible increase in space usage?
...ws environment where a line break is 2 chars (\r\n), we get this: Length = Floor(Ceiling(N/3) * 4 * 78 / 76)
Note: Flooring is because during my test with C#, if the last line ends at exactly 76 chars, no line-break follows.
I can prove it by running the following code:
byte[] bytes = new byte[1...
C++ : why bool is 8 bits long?
...
If I may contribute a dodgy analogy: there are eight floors in my building, but the Post Office doesn't acknowledge that they are different addresses. So if I want an address all to myself, then I have to rent the whole building, even though I actually fit on one floor. I'm not...
Log to the base 2 in python
...ber, extracting the exponent is pretty efficient:
log2int_slow = int(math.floor(math.log(x, 2.0)))
log2int_fast = math.frexp(x)[1] - 1
Python frexp() calls the C function frexp() which just grabs and tweaks the exponent.
Python frexp() returns a tuple (mantissa, exponent). So [1] gets the expone...
Scala Doubles, and Precision
...
Here's another solution without BigDecimals
Truncate:
(math floor 1.23456789 * 100) / 100
Round:
(math rint 1.23456789 * 100) / 100
Or for any double n and precision p:
def truncateAt(n: Double, p: Int): Double = { val s = math pow (10, p); (math floor n * s) / s }
Similar ca...
Where to place and how to read configuration resource files in servlet based application?
... am using Netbeans IDE which is having two separate folders for source and JSP files.
6 Answers
...
Android: Generate random color on click?
...1;
int[] colors = new int[2];
int a = 256;
int r1 = (int) Math.floor(Math.random() * RGB);
int r2 = (int) Math.floor(Math.random() * RGB);
int r3 = (int) Math.floor(Math.random() * RGB);
colors[0] = Color.rgb(r1, r2, r3);
if((r1 + r2 + r3) > 450) {
colors[1] = ...
What does -XX:MaxPermSize do?
...oad many classes; for example,
some implementations of JavaServer Pages (JSP) pages. These
applications may need a larger permanent generation to hold the
additional classes. If so, the maximum permanent generation size can
be increased with the command-line option -XX:MaxPermSize=.
Note t...
How to calculate time in hours between two dates in iOS
...ds = [today10am timeIntervalSinceDate:dateT];
NSInteger days = (int) (floor(seconds / (3600 * 24)));
if(days) seconds -= days * 3600 * 24;
NSInteger hours = (int) (floor(seconds / 3600));
if(hours) seconds -= hours * 3600;
NSInteger minutes = (int) (floor(seconds / 60));
i...
Ruby off the rails
...apa.com/home)
The part that I spent most of my time on was an interactive floor map. The Map on the floor has sensors so when people walk on it lights are triggered and displays in the wall show images or videos and audio tracks are played.
All the control code for this part of the exhibit is ruby...
Get Character value from KeyCode in JavaScript… then trim
...ou should use a more general algorithm:
let chrCode = keyCode - 48 * Math.floor(keyCode / 48);
let chr = String.fromCharCode((96 <= keyCode) ? chrCode: keyCode);
If you're curious as to why, this is apparently necessary because of the behavior of the built-in JS function String.fromCharCode()....