// @nuget: Z.Expressions.Eval

​

using System;

using Z.Expressions;

using System.Linq;

​

public class Program

{

    public static void Main()

    {

        var startBalance = 100.0;

        int[] attemptedWithdrawals = {20, 10, 40, 50, 10, 70, 30};

        var endBalance = attemptedWithdrawals.Execute<double>("Aggregate(startBalance, (balance, nextWithdrawal) => ((nextWithdrawal <= balance) ? (balance - nextWithdrawal) : balance))", new {startBalance});

        Console.WriteLine("Ending balance: {0}", endBalance);

    }

}