05. Coins

using System;

namespace Coins
{
    class Program
    {
        static void Main(string[] args)
        {
            int change = (int)(double.Parse(Console.ReadLine()) * 100);
            int coins = 0;

            while (change > 0)   //ИЛИ:  for (int i = 0; change > 0; i++)
            {
                if (change >= 200)
                {
                    change -= 200;
                }
                else if (change >= 100)
                {
                    change -= 100;
                }
                else if (change >= 50)
                {
                    change -= 50;
                }
                else if (change >= 20)
                {
                    change -= 20;
                }
                else if (change >= 10)
                {
                    change -= 10;
                }
                else if (change >= 5)
                {
                    change -= 5;
                }
                else if (change >= 2)
                {
                    change -= 2;
                }
                else
                {
                    change--;
                }
                coins++;
            }
            Console.WriteLine(coins);
        }
    }
}


РЕШЕНИЕ БЕЗ ЦИКЪЛ:

using System;

namespace Coins
{
    class Program
    {
        static void Main(string[] args)
        {
            int change = (int)(double.Parse(Console.ReadLine()) * 100);
            int coins = 0;

            if (change >= 200)
            {
                coins += (int)(change / 200);
                change %= 200;
            }
            if (change >= 100)
            {
                coins += (int)(change / 100);
                change %= 100;
            }
            if (change >= 50)
            {
                coins += (int)(change / 50);
                change %= 50;
            }
            if (change >= 20)
            {
                coins += (int)(change / 20);
                change %= 20;
            }
            if (change >= 10)
            {
                coins += (int)(change / 10);
                change %= 10;
            }
            if (change >= 5)
            {
                coins += (int)(change / 5);
                change %= 5;
            }
            if (change >= 2)
            {
                coins += (int)(change / 2);
                change %= 2;
            }
            if (change == 1)
            {
                coins++;
                change--;
            }

            Console.WriteLine(coins);
        }
    }
}

РЕШЕНИЕ С ТЕРНАРЕН ОПЕРАТОР:

using System;

namespace Coins
{
    class Program
    {
        static void Main(string[] args)
        {
            int change = (int)(double.Parse(Console.ReadLine()) * 100);
            int coins = 0;

            while (change != 0)
            {
                change -= change >= 200 ? 200
                        : change >= 100 ? 100
                        : change >= 50 ? 50
                        : change >= 20 ? 20
                        : change >= 10 ? 10
                        : change >= 5 ? 5
                        : change >= 2 ? 2 : 1;

                coins++;
            }
            Console.WriteLine(coins);
        }
    }
}


РЕШЕНИЕ С МАСИВ:

using System;

namespace Coins
{
    class Program
    {
        static void Main(string[] args)
        {
            int change = (int)(double.Parse(Console.ReadLine()) * 100);
            int[] coinValues = new[] { 200, 100, 50, 20, 10, 5, 2, 1 };
            int coins = 0;

            for (int i = 0; i < coinValues.Length; i++)
            {
                if (change >= coinValues[i])
                {
                    coins += (int)(change / coinValues[i]);
                    change %= coinValues[i];
                }
            }
            Console.WriteLine(coins);
        }
    }
}