Explain Params Array in C# with an example.

Answer:

If we want to pass variable number of arguments from calling function to called function, we can use the Params Arrays
e.g.

public class ParamTest



{



        static void Main()



        {



                //calling function



                PerformArithmeticOperation(20,10,"+"); //perform addition



                PerformArithmeticOperation(20,10,"-"); //perform subtraction



                PerformArithmeticOperation(20,10,"*"); //perform multiplication



                PerformArithmeticOperation(20,10,"/"); //perform division



        }







        //called function



        public static void PerformArithmeticOperation(params object[] items)



        {        



        var result = 0;



        switch (Convert.ToString(items[2]))   //items[2] is the operator(s) i.e. +,-,*,/



        {



         case '+': result = Convert.ToInt32(items[0]) + Convert.ToInt32(items[1]); break;



         case '-': result = Convert.ToInt32(items[0]) - Convert.ToInt32(items[1]); break;



         case '*': result = Convert.ToInt32(items[0]) * Convert.ToInt32(items[1]); break;



         case '/': result = Convert.ToInt32(items[0]) / Convert.ToInt32(items[1]); break;



         default: Console.WriteLine("No such operation available");



        }



        Console.WriteLine(result);              



        }



}

We also can send no arguments. If we send no arguments, the length of the params list is zero.