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How do you round a floating point number in Perl?
... and floor()?
Trig functions?
Remember that int() merely truncates toward 0. For rounding to a certain number of digits, sprintf() or printf() is usually the easiest
route.
printf("%.3f", 3.1415926535); # prints 3.142
The POSIX module (part of the standard Perl distribution) implement...
How to validate an Email in PHP?
...LTER_VALIDATE_EMAIL)
PHP Manual filter_var()
Available in PHP >= 5.2.0
If you don't want to change your code that relied on your function, just do:
function isValidEmail($email){
return filter_var($email, FILTER_VALIDATE_EMAIL) !== false;
}
Note: For other uses (where you need Regex)...
How can I profile Python code line-by-line?
...
120
I believe that's what Robert Kern's line_profiler is intended for. From the link:
File: pyston...
How do I check to see if a value is an integer in MySQL?
...lar expression. Simply do
select field from table where field REGEXP '^-?[0-9]+$';
this is reasonably fast. If your field is numeric, just test for
ceil(field) = field
instead.
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Get Slightly Lighter and Darker Color from UIColor
...
280
- (UIColor *)lighterColorForColor:(UIColor *)c
{
CGFloat r, g, b, a;
if ([c getRed:&...
How do you detect Credit card type based on number?
...
+50
The credit/debit card number is referred to as a PAN, or Primary Account Number. The first six digits of the PAN are taken from the I...
Designing function f(f(n)) == -n
...w about:
f(n) = sign(n) - (-1)n * n
In Python:
def f(n):
if n == 0: return 0
if n >= 0:
if n % 2 == 1:
return n + 1
else:
return -1 * (n - 1)
else:
if n % 2 == 1:
return n - 1
else:
return -1 * (n ...
How do I base64 encode (decode) in C?
...
106
Here's the one I'm using:
#include <stdint.h>
#include <stdlib.h>
static char en...
Error to install Nokogiri on OSX 10.9 Maverick?
...
30 Answers
30
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What's the (hidden) cost of Scala's lazy val?
...uivalent to the following Java code:
class LazyTest {
public int bitmap$0;
private String msg;
public String msg() {
if ((bitmap$0 & 1) == 0) {
synchronized (this) {
if ((bitmap$0 & 1) == 0) {
synchronized (this) {
msg = "La...