Save the change

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// Save the change program

using System;

class Submission
{
    // -------------------------
    // Subprograms
    // -------------------------
    static int nearest_pound(double amount)
    {
        return (int)Math.Floor(amount) + 1;
    }


    static double save_the_change(double amount)
    {
        double savings;
        if (Math.Floor(amount) != amount)
        {
            savings = nearest_pound(amount) - amount;
        }
        else
        {
            savings = 1;
        }
        return savings;
    }


    // -------------------------
    // Main program
    // -------------------------
    public static void Main(string[] args)
    {
        Console.WriteLine("Enter the purchase price: £");
        double purchase_price = Convert.ToDouble(Console.ReadLine());
        int debit = nearest_pound(purchase_price);
        double savings = save_the_change(purchase_price);
        Console.WriteLine(string.Format("Debit - £{0:F2}", debit));
        Console.WriteLine(string.Format("Credit to savings - £{0:F2}", savings));
    }

}