constant field member in c#

Question

hi all i am confused const long size =((long)int.Maxvalue+1)/4 how i interprate it... and what will happen when we define static const long size =((long)int.Maxvalue+1)/4... what is readonly member....

Answer 1

const

A constant member is defined at compile time and cannot be changed at runtime. Constants are declared as a field, using the const keyword and must be initialized as they are declared. For example;

public class MyClass
{
  public const double PI = 3.14159;
}

can't declare a member of class as "static const".

• Because member variables declared as "const" are already "static".

PI cannot be changed in the application anywhere else in the code as this will cause a compiler error.

readonly

A read only member is like a constant in that it represents an unchanging value. The difference is that a readonly member can be initialized at runtime, in a constructor as well being able to be initialized as they are declared. For example:

public class MyClass
{
  public readonly double PI;

  public MyClass()
  {
    PI = 3.14159;
  }
}