Abstract Class | C# Online Compiler

Abstract Class by Lakshmana Kumar

using System;

public abstract class DatabaseCommon // Can't be privae/protected/protected internal/sealed/static
{
	public abstract void AbsMtd1(); // Can't be virtual
	
	public virtual void AbsMtd2() // Not mandatory to overide it in child class
	{
	}
}

public class SQLServer : DatabaseCommon
{
	public override void AbsMtd1()
	{
	}
	
	public override void AbsMtd2() // Optional
	{
	}
}

public class Oracle : DatabaseCommon
{
	public override void AbsMtd1()
	{
	}
}

public class Program
{
	public static void Main()
	{
		Console.WriteLine("Hello World");
	}
}

​x
 
using System;
​
public abstract class DatabaseCommon // Can't be privae/protected/protected internal/sealed/static
{
    public abstract void AbsMtd1(); // Can't be virtual
    
    public virtual void AbsMtd2() // Not mandatory to overide it in child class
    {
    }
}
​
public class SQLServer : DatabaseCommon
{
    public override void AbsMtd1()
    {
    }
    
    public override void AbsMtd2() // Optional
    {
    }
}
​
public class Oracle : DatabaseCommon
{
    public override void AbsMtd1()
    {
    }
}
​
public class Program
{
    public static void Main()
    {
        Console.WriteLine("Hello World");
    }
}

Compilation error (line 43, col 4): } expected
Compilation error (line 14, col 9): System.Void cannot be used from C# -- use typeof(void) to get the void type object
Compilation error (line 14, col 14): 'Program.agenda.indentity()': not all code paths return a value
Compilation error (line 33, col 12): 'Program.agenda' does not contain a definition for 'identity' and no accessible extension method 'identity' accepting a first argument of type 'Program.agenda' could be found (are you missing a using directive or an assembly reference?)
Compilation error (line 22, col 23): Field 'Program.detailActivity.description' is never assigned to, and will always have its default value null

Last Run:	4:41:01 am
Compile:	0.03s
Execute:	0s
Memory:	0b
CPU:	0s

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