C#

Sharma Dinesh Kumar wrote:

When We Have To Use Abstract Class Or When Interface

public abstract class A(){...}
public abstract class B(){...}
//this class will get the published attribute from class A
class DA : A{...}
//this class will get the published attribute from class B
class DB : B{...}
//below this cannot be applied
//class AB : A,B{...}

public interface IA{...}
public interface IB{...}
//this class will get the published attribute from interface IA
class A : IA{...}
//this class will get the published attribute from interface IB
class B : IB{...}
//this class will get the published attribute from both interface IA and IB, this is the difference implementation from abstract
class AB : IA, IB {...}

public interface IVehicle
{
    int WheelCount { get; }
}

public abstract class CarBase
{
    public int WheelCount
    {
        get { return 4; }
    }
}

public abstract class BikeBase
{
    public int WheelCount
    {
        get { return 2; }
    }
}

public interface ICar : IVehicle
{
    int DoorCount { get; }
}

public class Car : CarBase, ICar
{
    private int _DoorCount;

    public Car(int doorCount)
    {
        _DoorCount = doorCount;
    }

    public int DoorCount
    {
        get { return _DoorCount; }
    }
}

public class Bike : BikeBase, IVehicle
{ }

Car myCar = new Car(4);
Bike myBike = new Bike();

low_sinwei@yahoo.com wrote:

How the sequential structure code looked like?

class Program{public static int Oct(int dec){return ((dec / 8) * 10) + (dec % 8);}static void Main(string[] args){...

[StructLayout(LayoutKind.Sequential)]
private struct MIDIINCAPS
{
    public ushort wMid;
    public ushort wPid;
    public uint vDriverVersion;     // MMVERSION
    [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 32)]
    public string szPname;
    public uint dwSupport;
}