C# Method Name Expected Error

Question

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace DebtCalculator
{
    class Program
    {
        static void Main(string[] args)
        {
            double creditcardbalance;
            Console.WriteLine("Enter in credit card balance:");
            creditcardbalance = double.Parse(Console.ReadLine());

            double monthlypayementamount;
            Console.WriteLine("Enter in the monthly payement amount:");
            monthlypayementamount = double.Parse(Console.ReadLine());

            double percentagerate;
            Console.WriteLine("Enter in annual percentage rate:");
            percentagerate = double.Parse(Console.ReadLine());

            int payoff;
            double dailyinterestrate;
            dailyinterestrate = percentagerate / 365;
            payoff = -(1 / 30) * Math.Log(1 + creditcardbalance / monthlypayementamount (1 - (1 + dailyinterestrate), Math.Pow(0, 30))) / Math.Log(1 + dailyinterestrate);
        }

    }
}

the "payoff = -(1 / 30) * Math.Log(1 + creditcardbalance / monthlypayementamount " where it says monthlypayementamount it returns an error of "method name expected" how do i resolve?

Answer 1

Looking at the formula your equation should be like this.

payoff = -(1d / 30) * Math.Log(1 + creditcardbalance / monthlypayementamount * (1 - Math.Pow(1 + dailyinterestrate, 30))) / Math.Log(1 + dailyinterestrate);

Your problems. in mathematics p(2) may translate to p*(2) but in coding you have to write everything p*(2) .

And the part Math.Pow(0,30) evaluates to 0^30 . you have to put 1 + dailyinterestrate (according to formula) instead of 0.

Also the result of this equation is type of double. but payoff as i see now is type of int . change the type of payoff to double or cast the result to int.

The other problem is -(1/30) . they are both integer means the result is without decimal. so put d after the number so it will be type of double which holds decimal part. thanks to @ASH

You must Write the result in the console with Console.WriteLine() method

your code should look like this.

double payoff;
double dailyinterestrate;
dailyinterestrate = percentagerate / 365;
payoff = -(1d / 30) * Math.Log(1 + creditcardbalance / monthlypayementamount * (1 - Math.Pow(1 + dailyinterestrate, 30))) / Math.Log(1 + dailyinterestrate);

Console.WriteLine(payoff);