primitive

问题 Using Jon Skeet's article Making reflection fly and exploring delegates as a guide, I am trying to use the Delegate.CreateDelegate method to duplicate properties as delegates. Here's an example class: public class PropertyGetter { public int Prop1 {get;set;} public string Prop2 {get;set;} public object GetPropValue(string propertyName) { var property = GetType().GetProperty(propertyName).GetGetMethod(); propertyDelegate = (Func<object>)Delegate.CreateDelegate(typeof(Func<object>), this,

问题 Please take a look at below example i cant understand the relation between char and byte byte b = 1; char c = 2; c = b; // line 1 Give me compilation Error because c is type of char and b is type of byte so casting is must in such condition but now the tweest here is when i run below code final byte b = 1; char c = 2; c = b; // line 2 line 2 compile successfully it doesn't need any casting at all so my question is why char c behave different when i use final access modifier with byte 回答1:

问题 While I know that by definition a boolean consists of only two states, true or false. I was wondering what value does a boolean have before it is initialized with one of these states. 回答1: It defaults to false. Edit: By popular demand: unless you're using the wrapped Boolean, which defaults to null. – sudhir.j 回答2: If it is a local variable, it is a compiler error to reference it before it was initialized. If it is a field, it is initialized to false. 回答3: public class NewMain { boolean foo;

问题 While I know that by definition a boolean consists of only two states, true or false. I was wondering what value does a boolean have before it is initialized with one of these states. 回答1: It defaults to false. Edit: By popular demand: unless you're using the wrapped Boolean, which defaults to null. – sudhir.j 回答2: If it is a local variable, it is a compiler error to reference it before it was initialized. If it is a field, it is initialized to false. 回答3: public class NewMain { boolean foo;

问题 Unlike Java or C#, primitive data types in C++ can vary in size depending on the platform. For example, int is not guaranteed to be a 32-bit integer. Various compiler environments define data types such as uint32 or dword for this purpose, but there seems to be no standard include file for fixed-size data types. What is the recommended method to achieve maximum portability? 回答1: I found this header particularly useful: BOOST cstdint Usually better than inventing own wheel (which incurs the

问题 A discussion earlier today led me to question whether or not my understanding of primtives and literals is correct. My understanding is that a literal type is specifically a type which can have a value assigned using a notation that both human and compiler can understand without specific type declarations: var firstName = "John"; // "John" is literal var firstName = (string)"John"; // *if* the compiler didn't understand that "John" // was a literal representation of a string then I // would

问题 I'm doing a check in an iPhone application - int var; if (var != nil) It works, but in X-Code this is generating a warning "comparison between pointer and integer." How do I fix it? I come from the Java world, where I'm pretty sure the above statement would fail on compliation. 回答1: Primitives can't be nil . nil is reserved for pointers to Objective-C objects. nil is technically a pointer type, and mixing pointers and integers will without a cast will almost always result in a compiler

问题 I'm a Java developer who is just starting to learn Ruby. Does Ruby have any primitive types? I can't seem to find a list of them. If not, why? 回答1: A core principle of Ruby is that all data should be represented as objects. Other languages such as Smalltalk follow a similar paradigm. The benefit of this design is that it makes Ruby more elegant and easier to learn. The rules applying to objects are consistently applied to all of Ruby. For instance, when beginners are first learning Java, the

问题 I came across a strange corner of Java.(It seems strange to me) double dd = 3.5; float ff = 3.5f; System.out.println(dd==ff); o/p: true double dd = 3.2; float ff = 3.2f; System.out.println(dd==ff); o/p: false I observed that if we compare any two values (a float and a double as I mentioned in the example) with .5 OR .0 like 3.5, 234.5, 645.0 then output is true i.e. two values are equal otherwise output is false though they are equals. Even I tried to make method strictfp but no luck. Am I

问题 I'm pretty new to xna development and want to position the Cubes from the Primitives3D sample by passing a position vector to the constructor .. unfortunatly it does not work .. instead it is just spinning arround.. Thats how i modified the code of the cubeprimitive class: public class CubePrimitive : GeometricPrimitive { public Vector3 position; /// <summary> /// Constructs a new cube primitive, using default settings. /// </summary> public CubePrimitive(GraphicsDevice graphicsDevice) : this