About Constructor

Thirupathi v

Hi Folks,

I am Beginner to C#. actually i attended the interview. they asking the question like that..

class A

{

public class A()

{

int a;

int b;

public int CalCum()

{

Return a+b;

}

in the above program a=10, b=20. i have few questions these are given below

1) How to call the constructor and pass the arguments?

2) How to use the arraylist in the program?

3) How to Pass the arguments by using Arraylist and show result?

Please help me. how to solve this secenrio? can anyone help for me

2 Replies

Know the answer? Post it — somebody with the same question will find it here.

Thirupathi v18y ago
Hi i ill check it out and then if it has any issue, come back to u thankz
Alan18y ago
Check this out:

using System;
using System.Collections; // needed for ArrayList

class Program
{
   static void Main()
   {
      A a = new A(10, 20);
      int total = a.CalSum();
      Console.WriteLine("The sum using the constructor is " + total);

      A a2 = new A();
      ArrayList al = new ArrayList();
      al.Add(10);
      al.Add(20);
      a2.SetParameters(al);
      int total2 = a2.CalSum();
      Console.WriteLine("The sum using the arraylist is " + total2);

      Console.ReadLine(); // to pause before exiting
   }
}

public class A
{

   int a;
   int b;

   // constructor with no parameters
   public A()
   {
   }

   // constructor with two parameters
   public A(int a, int b)
   {
      this.a = a;
      this.b = b;
   }

   //using arraylist to pass arguments
   public void SetParameters(ArrayList al)
   {
      // in practice you'd need some error checking here
      this.a = (int)al[0];
      this.b = (int)al[1];
   }

   public int CalSum()
   {
      return a+b;
   }

}