IT SOLUTIONS
Your full service technology partner! 
-Collapse +Expand
To/From Code
-Collapse +Expand Cross Ref Guide
-Collapse +Expand Members-Only
Sign in to see member-only pages.
   ► KBTo/From GuidesVB.Net  Print This     

Constants (VB.Net and C++/CLI Cross Reference Guide)

By Mike Prestwood

VB.Net versus C++/CLI: A side by side comparison between VB.Net and C++/CLI.

 
Language Basics
 

Language basics is kind of a catch all for absolute beginner stuff. The items (common names) I chose for language basics is a bit random and include items like case sensitivity, commenting, declaring variables, etc.

Constants

[Other Languages] 

General Info: Computer Language Constants

A constant is just like a variable (it holds a value) but, unlike a variable, you cannot change the value of a constant.

VB.Net:   Const kPI Double = 3.1459

In VB.Net, you define constants with the Const keyword.

All constants are part of a class (no global constants) but you can make a constant public and have access to it using ClassName.ConstantName so long as you have added the class to the project. This works even without creating the class as if the public constants were static, but you cannot use the Shared keyword.

Constants must be of an integral type (sbyte, byte, short, ushort, int, uint, long, ulong, char, float, double, decimal, bool, or string), an enumeration, or a reference to null.

Syntax Example:
Public Class Convert
Inherits System.Object
 
  Public Const kName As String = "Mike"
  Private Const kPI Double = 3.1459
 
  //Declare two or more on same line too:
Const kFeetToMeter = 3.2808, kMeterToFeet = 0.3048
End Class
C++/CLI:   const or literal

C++/CLI supports the const and static const keywords of standard C++ as well as the new literal keyword. A literal is equivalent to static const in standard C++ and Microsoft's documentation recommends to replace static const with the new literal keyword because a literal is available in metadata; a static const variable is not available in metadata to other compilers.

You can use static const within the class declaration or locally within a method. However, literal is only valid in the class declaration section and const is only valid within a method.

Syntax Example:  
//some method {
const String^ MyName = "John";
static const Int32 MyAge = 27;
//}
// public class SomeClass : public Object {
public:
  literal double Pi = 3.14159;
  literal String^ MyName = "Mike";
  static const Int32 MyAge = 35;
//...












Sales Website: www.prestwood.com Or visit our legacy sales site: 
legacy.prestwood.com


©1995-2025 Prestwood IT Solutions.   [Security & Privacy]