c# base in costructor code example

Example 1: c# superclass constructor

// Create Constructor in superclass
public Vehicle( double speed )
    {
      Speed = speed;
      LicensePlate = Tools.GenerateLicensePlate();
    }

//Original Constructor
class Sedan
  {
    public Sedan(double speed)
    {
      Speed = speed;
      LicensePlate = Tools.GenerateLicensePlate();
      Wheels = 4;
    }

// Remove 'Speed' and 'LicensePlate' from Sedan Constructor
// Add 'class Sedan : Vehicle '
// Add 'public Sedan(double speed) : base(speed)'
  
//New Constructor
class Sedan : Vehicle
  {
    public Sedan(double speed) : base(speed)
    {
      Wheels = 4;
    }
  }

Example 2: c# base class without empty constructor

class A
{
    public A(int x, int y)
    {
        // do something
    }
}

class A2 : A
{
    public A2() : base(1, 5)
    {
        // do something
    }

    public A2(int x, int y) : base(x, y)
    {
        // do something
      	// but no need to repeat the statements from the original constructor
    }

    // This would not compile:
    public A2(int x, int y)
    {
        // the compiler will look for a constructor A(), which doesn't exist
    }
}