A Struct is very similar to a Class, however whereas a Class is a reference type a Struct is a value type. Also, Classes support inheritance whereas Structs do not.
In practice Structs are a lightweight class which are often used for numeric types. As they are a value type, each instance does not require instantiation of an object on the heap.
Structs must has parameters in the constructor but cannot have a finalizer or virtual members. Instantiating a constructor can be done without providing parameters which just sets them to zero.
Example:
//Struct Example:
-
public struct Bmindex
-
{
-
double height, weight;
-
public Point (double height, double weight) {this.height = height; this.weight = weight;}
-
}
-
-
…
-
Bmindex p1 = new Bmindex (); // p1.height and p1.weight will be 0
-
Bmindex p2 = new Bmindex (1.8, 78); // p1.height = 1.8 p1.weight = 78
