Exam Prep OOP(Constructors , Inheritance , interface , polymorphism , Exception Handling

try
{
}
catch
{
}
finally
{
}

try
{
}
catch
{
}
finally
{
}

!eval for(int i = 0; i < 4; i++) Console.WriteLine(i);

!eval for(int i = 0; i < 4; i++) Console.WriteLine(i);

c#
internal class MyClass: ISomeInterface
{
    public abstract int MyMethod();
}

c#
internal class MyClass: ISomeInterface
{
    public abstract int MyMethod();
}

internal interface InterfaceA
{}
internal interface InterfaceB : InterfaceA
{}

internal interface InterfaceA
{}
internal interface InterfaceB : InterfaceA
{}

public interface InterfaceA
{
  public static bool IsStatic() => true;
}

public interface InterfaceA
{
  public static bool IsStatic() => true;
}

cs try {int x = Convert.Toint32(Console.Readline());} catch(format exception fe) { console.writeline("hi); 

cs try {int x = Convert.Toint32(Console.Readline());} catch(format exception fe) { console.writeline("hi); 

c#
internal interface IHaveStaticMembers
{
    public static abstract void StaticMethod();
    public static abstract int StaticInt { get; }
}

internal static class MyClass
{
    public static void AMethod<T>() where T: IHaveStaticMembers
    {
        T.StaticMethod();
        var someVar = T.StaticInt;
    }
} 

c#
internal interface IHaveStaticMembers
{
    public static abstract void StaticMethod();
    public static abstract int StaticInt { get; }
}

internal static class MyClass
{
    public static void AMethod<T>() where T: IHaveStaticMembers
    {
        T.StaticMethod();
        var someVar = T.StaticInt;
    }
} 

try
{
  // The code that might throw an exception
}
catch(ErrorCodeException ex) when (ex.ErrCode == 0xC00007b)
{
}
catch(ErrorCodeException ex) when (ex.ErrCode == 0xddddddd)
{
}

try
{
  // The code that might throw an exception
}
catch(ErrorCodeException ex) when (ex.ErrCode == 0xC00007b)
{
}
catch(ErrorCodeException ex) when (ex.ErrCode == 0xddddddd)
{
}

c#
internal interface IHaveStaticMembers
{
    /// <summary>
    /// This needs to be implemented by the class
    /// </summary>
    public static abstract int StaticInt { get; }

    /// <summary>
    /// This is a static on an interface, you don't need to implement it.
    /// </summary>
    public static int StaticIntOnTheInterface { get; } = 10;
}

c#
internal interface IHaveStaticMembers
{
    /// <summary>
    /// This needs to be implemented by the class
    /// </summary>
    public static abstract int StaticInt { get; }

    /// <summary>
    /// This is a static on an interface, you don't need to implement it.
    /// </summary>
    public static int StaticIntOnTheInterface { get; } = 10;
}

 if (employee!=null){
salary = employee.basesalary;

 if (employee!=null){
salary = employee.basesalary;

class User
{
  public string Name {get;set;}
  public User()
  { }
}

class User
{
  public string Name {get;set;}
  public User()
  { }
}

class User
{
  public string? Name {get;set;}
  public User()
  { }
}

class User
{
  public string? Name {get;set;}
  public User()
  { }
}

var myuser = new User():
if(myuser.Name == "John")
{
}

var myuser = new User():
if(myuser.Name == "John")
{
}

: base(message)

: base(message)

class MyClass
{
  public const string MyConst = "Hello";
}
var v = MyClass.MyConst;

class MyClass
{
  public const string MyConst = "Hello";
}
var v = MyClass.MyConst;

public MyClass
{
  public static string MyStatic = "Hello";
}

public MyClass
{
  public static string MyStatic = "Hello";
}

 if(animal instanceof dog){
animale.move();
} 

 if(animal instanceof dog){
animale.move();
} 

IFoo thing = new Bar(); // Bar : IFoo

if (thing is Bar b) // `b` is of type `Bar` here, no longer `IFoo`
{
    // ...
}
else if (thing is Quz q) //  `q` is of type `Quz`, like above
{
    // ...
}

IFoo thing = new Bar(); // Bar : IFoo

if (thing is Bar b) // `b` is of type `Bar` here, no longer `IFoo`
{
    // ...
}
else if (thing is Quz q) //  `q` is of type `Quz`, like above
{
    // ...
}