static void Main()
{
//Class1.Display() You can not colled that
class1 o; // o is a reference of type Class1
o = new class1(); // Allocate memory for an object of type Class1 and make o point to it
//class1 o = new class1();
o.Display();
o.Display("Rahul");
//Positional parameters
Console.WriteLine(o.Add(10, 20, 30, 40));
Console.WriteLine(o.Add(10, 20, 30));
Console.WriteLine(o.Add(10, 20));
Console.WriteLine(o.Add(10));
Console.WriteLine(o.Add());
// Named Parametsre
Console.WriteLine(o.Add(d: 40));
Console.WriteLine(o.Add(c: 30));
Console.WriteLine(o.Add(d: 40, c: 30));
//Add2
//Console.WriteLine(o.Add2(d: 40));
Console.WriteLine(o.Add2(d: 40, a: 40, b: 40, c: 40));
Console.ReadLine();
}
static void Main()
{
// class1 o; // o is a ref of type Class1
// o = new class1(); // allocate memory for an obj of type class1 and make to point to it.
class1 o = new class1();
o.Display();
o.Display("Shradha");
// positional parameters
Console.WriteLine(o.Add(10, 20, 30, 40));
Console.WriteLine(o.Add(10, 20, 30));
Console.WriteLine(o.Add(10, 20));
Console.WriteLine(o.Add(10));
Console.WriteLine(o.Add());
Console.WriteLine();
//named parameters
Console.WriteLine(o.Add(d: 40));
Console.WriteLine(o.Add(c: 30));
Console.WriteLine(o.Add(d: 40, c: 30));
//Console.WriteLine(o.Add2(d: 40)); // Error
//Console.WriteLine(o.Add2(a: 30)); // Error
Console.WriteLine(o.Add2(d: 40, c: 30, a: 40, b: 30));
Console.ReadLine();
}