CoinCounter

using System;
namespace CoinCounter
{
    internal class Program
    {
        static readonly Tuple<string, int>[] Coins = new Tuple<string, int>[] {
            new Tuple<string, int>("Quarters", 25),
            new Tuple<string, int>("Dimes", 10) ,
            new Tuple<string, int>("Nichels", 5),
            new Tuple<string, int>("Pennies", 1) };

        static void Main(string[] args)
        {
            double amount;
            do
            {
                Console.WriteLine("Enter any positive currency amount: ");
            } while (!double.TryParse(Console.ReadLine(), out amount) || amount < 0);
            amount *= 100;
            for (int i = 0; i < 4; i++)
            {
                int quot = (int)(amount / Coins[i].Item2);
                amount -= quot * Coins[i].Item2;
                Console.WriteLine((Coins[i].Item1 + ":").PadRight(10) + quot);
            }
            Console.ReadLine();
        }
    }
}