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Program 2

using System;

class B {
  
  public static void Main(){
    A a = new A(5);   
    double d;

    a[1] = 6; a[2] = 7.0; a[3] = 8.0;  

    d = a[1] + a[2];   
                       

    Console.WriteLine("a: {0}, d: {1}", a, d);
  }
}