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How to work with complex numbers in C?
...e into complex, use _Complex_I macro from complex.h:
float _Complex d = 2.0f + 2.0f*_Complex_I;
(actually there can be some problems here with (0,-0i) numbers and NaNs in single half of complex)
Module is cabs(a)/cabsl(c)/cabsf(b); Real part is creal(a), Imaginary is cimag(a). carg(a) is for c...
What is the difference between Spring, Struts, Hibernate, JavaServer Faces, Tapestry?
...modern, standardized and very nice equivalent of the above frameworks: JSF 2.0 and Facelets for the presentation, JPA 2.0 for the persistence, Dependency Injection, etc. For a new development, this is IMO a serious option, Java EE 6 is a great stack.
See also
Choosing a Java Web Framework now?
Ja...
Draw line in UIView
...orWithColor(context, [UIColor redColor].CGColor);
// Draw them with a 2.0 stroke width so they are a bit more visible.
CGContextSetLineWidth(context, 2.0f);
CGContextMoveToPoint(context, 0.0f, 0.0f); //start at this point
CGContextAddLineToPoint(context, 20.0f, 20.0f); //draw to t...
Convert between UIImage and Base64 string
...Data format
let imageData:NSData = NSData.init(contentsOfURL: url)!
Swift 2.0 > Encoding
let strBase64:String = imageData.base64EncodedStringWithOptions(.Encoding64CharacterLineLength)
Swift 2.0 > Decoding
let dataDecoded:NSData = NSData(base64EncodedString: strBase64, options: NSDataBase64D...
How do you test to see if a double is equal to NaN?
...------------------------------------------";
Double numerator = -2.0;
Double denominator = -2.0;
while (denominator <= 1) {
Double x = numerator/denominator;
Double y = new Double (x);
boolean z = y.isNaN();
System.out.println("y ...
Wait for page load in Selenium
How do you make Selenium 2.0 wait for the page to load?
47 Answers
47
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Split a string by another string in C#
...
As of .NET Core 2.0, there is an override that takes a string.
So now you can do "THExxQUICKxxBROWNxxFOX".Split("xx").
See https://docs.microsoft.com/en-us/dotnet/api/system.string.split?view=netcore-2.0#System_String_Split_System_String_S...
JPA: How to have one-to-many relation of the same Entity type
...ip is the same. The general case is detailed in Section 2.10.2 of the JPA 2.0 spec.
Here's a worked example. First, the entity class A:
@Entity
public class A implements Serializable {
@Id
@GeneratedValue(strategy=GenerationType.AUTO)
private Long id;
@ManyToOne
private A pa...
ASP.Net error: “The type 'foo' exists in both ”temp1.dll“ and ”temp2.dll"
... web.config file.
This problem occurs because of the way in which ASP.NET 2.0 uses the application references and the folder structure of the application to compile the application. If the batch property of the element in the web.config file for the application is set to true, ASP.NET 2.0 compiles...
How to Apply Gradient to background view of iOS Swift App
...ar gl:CAGradientLayer!
init() {
let colorTop = UIColor(red: 192.0 / 255.0, green: 38.0 / 255.0, blue: 42.0 / 255.0, alpha: 1.0).cgColor
let colorBottom = UIColor(red: 35.0 / 255.0, green: 2.0 / 255.0, blue: 2.0 / 255.0, alpha: 1.0).cgColor
self.gl = CAGradientLayer()
...