tainies me constructor, klaseis kai methodous

using System;

namespace ConsoleApp2
{
    class tainies
    {
        private double charge = 1.5;
        private double perDay;
        private int code, duration;
        private string title, category;
        public tainies(int inCode, int inDuration, string inTitle, string inCategory, double inPerDay)
        {
            code = inCode;
            duration = inDuration;
            title = inTitle;
            category = inCategory;
            perDay = inPerDay;
        }
        public tainies()
        {
            code = 0;
            duration = 0;
            title = "";
            category = "";
            perDay = 0;
        }
        public double cost(int days)
        {
            return charge + (days * perDay);
        }
        public void showMovie()
        {
            Console.WriteLine("Code: " + code + "Duration: " + duration + "Title: " + "Category: " + category);
        }
        public void changeCharge(int n)
        {
            charge = n;
        }
    }
    class Program
    {
        static void Main(string[] args)
        {

        }
    }
}