using System;

public class Program

{

    public static void Main()

    {

        Random r = new Random();

        float spendingCredit = 500.00F;

        float spendingMin = 00.01F;

        while (spendingCredit >= 0.1) {

            double randomPrice = r.NextDouble() * ((double)spendingCredit - (double)spendingMin) + (double)spendingMin;

​

            Console.WriteLine("Purchase: " + randomPrice);

​

            if ((float)randomPrice <= spendingCredit) {

                spendingCredit -= (float)randomPrice;

            }

            Console.WriteLine("Available credit: " + spendingCredit);

        }

    }

}