About Constructor

Question

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

Thirupathi v · Answer

Hi i ill check it out and then if it has any issue come back to u thankz

Alan · Answer

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; } }