c# abstract class constructor code example

Example 1: c# abstract class

abstract class Shape
{
    public abstract int GetArea();
}

class Square : Shape
{
    int side;

    public Square(int n) => side = n;

    // GetArea method is required to avoid a compile-time error.
    public override int GetArea() => side * side;

    static void Main() 
    {
        var sq = new Square(12);
        Console.WriteLine($"Area of the square = {sq.GetArea()}");
    }
}
// Output: Area of the square = 144

Example 2: c# class inheritance constructor

public otherclass{

    public otherclass(a,b){
          a=0;
          b=1;
    }

}

public baseClass : otherclass{
  
  	public baseClass(string str,int a, int b): base(a,b){
    	str="whatever";
    }
  
}

Example 3: what is abstract class in c#

Abstract class: is a restricted class that cannot be used to create objects 
(to access it, it must be inherited from another class).

Example 4: c# class constructor

//The Class
public class MyClass
{
  	//Some Variables
	public readonly int var1;
  	public readonly string var2;
  	//readonly only lets you set it ina constructor	
  
  	//The Constructor (public [class name](parameters))
  	public MyClass(int param1, string param2)
    {
      	//Setting the earlier variables
     	var1 = param1;
      	var2 = param2;
    }
}

//Creating an object using that class
MyClass Class1 = new MyClass(10, "Hello, World!");
MyClass Class2 = new MyClass(9999, "This is the second object!");

Console.WriteLine(Class1.var1);
Console.WriteLine(Class2.var2);

//Output
//10
//This is the second object!