using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace EuropeanCouncilVotingCalculator
{
class Calculator
{
   // Data abstraction
   // class attributes
   private Vote[] fullVotes; // fixed, original votes
   private Vote[] currentVotes; // updatable votes

   private int minApprovedMemberNum;
   private int votingMemberNum;

   // constant atrributes
   private const double MIN_POPULATION = 0.65;
   private const double MIN_YES = 0.55;




   /// <summary>
   /// constructor
   /// </summary>
   public Calculator()
   {
         // list of conutries
         string[] countries =
         {
            "Austria", "Belgium", "Bulgaria", "Croatia",
            "Cyprus", "Czech Republic", "Denmark", "Estonia",
            "Finland", "France", "Germany", "Greece",
            "Hungary", "Ireland", "Italy", "Latvia", "Lithuania",
            "Luxembourg", "Malta", "Netherlands", "Poland", "Portugal",
            "Romania", "Slovakia", "Slovenia", "Spain", "Sweden"
         };

         // list of population percentage
         double[] population =
         {
            1.98, 2.56, 1.56, 0.91,
            0.2, 2.35, 1.3, 0.3,
            1.23, 14.98, 18.54, 2.4,
            2.18, 1.1, 13.65, 0.43, 0.62,
            0.14, 0.11, 3.89, 8.49, 2.3,
            4.34, 1.22, 0.47, 10.49, 2.29
         };

         // set up array of votes
         fullVotes = new Vote[countries.Length];
         currentVotes = new Vote[countries.Length];
         for (int i = 0; i < fullVotes.Length; i++)
         {
            // object instantiation
            fullVotes[i] = new Vote(countries[i], population[i]);
            currentVotes[i] = new Vote(countries[i], population[i]);
         }

         votingMemberNum = fullVotes.Length;
         minApprovedMemberNum = (int)Math.Ceiling(votingMemberNum * MIN_YES);
   }

   /// <summary>
   /// class method
   /// calcualate total percent of countries which take part into the vote
   /// </summary>
   /// <returns>joining percent</returns>
   private double joiningPercent()
   {
         double percent = 0;
         for (int i = 0; i < currentVotes.Length; i++)
         {
            if (currentVotes[i].PARTICIPATING)
            {
               percent += fullVotes[i].Country.Percent;
            }
         }
         return percent;
   }

   /// <summary>
   /// reset all countries in array of currentVotes
   /// to meet the new requirement
   /// </summary>
   private void resetParticipating()
   {
         votingMemberNum = 0;
         double present = joiningPercent();

         // update population percent in the current vote
         for (int i = 0; i < currentVotes.Length; i++)
         {
            if (currentVotes[i].PARTICIPATING)
            {
               currentVotes[i].Country.Percent =
                     fullVotes[i].Country.Percent / present * 100.0;
               votingMemberNum++;
            }
         }

Goal Develop and implement a stack-based Sudoku puzzle solver. De...