using System;

public class Program

{

    public static void Main()

    {

​

        OrderHealthPercentageCalc1();

        OrderHealthPercentageCalc2();

        OrderHealthPercentageCalc3();

        AvgResponseTime1();

        AvgVendorDelay1();

        OrderContacts1();

        OrderContacts2();

        NetFailRate1();

            NetFailRate2();

    }

    private static void OrderHealthPercentageCalc1(){

        int totalOrders = 0;

        var orderHealthCount = 33;

        var Percentage = totalOrders != 0 ? (int)(decimal.Round((decimal)orderHealthCount / (decimal)totalOrders * 100)) : 0;

        Console.WriteLine("OrderHealth Percentage:" + Percentage + " expected: 0");

    }

    private static void OrderHealthPercentageCalc2(){

        int totalOrders = 100;

        var orderHealthCount = 33;

        var Percentage = totalOrders != 0 ? (int)(decimal.Round((decimal)orderHealthCount / (decimal)totalOrders * 100)) : 0;

        Console.WriteLine("OrderHealth Percentage:" + Percentage + " expected: 33");

    }

    private static void OrderHealthPercentageCalc3(){

        int totalOrders = 15;

        var orderHealthCount = 10;

        var Percentage = totalOrders != 0 ? (int)(decimal.Round((decimal)orderHealthCount / (decimal)totalOrders * 100)) : 0;

        Console.WriteLine("OrderHealth Percentage:" + Percentage + " expected: 67");

    }

    private static void OrderContacts1(){

        int noOfContacts = 5;

        int prevNoOfContacts = 0;

        var Change = prevNoOfContacts != 0 ? decimal.Round((decimal)(noOfContacts - prevNoOfContacts) / (decimal)prevNoOfContacts * 100, 1) : (decimal?)null;

        Console.WriteLine("OrderContact Change:" + Change + " expected: null");

    }

    private static void OrderContacts2(){

        int noOfContacts = 5;

        int prevNoOfContacts = 2;

        var Change = prevNoOfContacts != 0 ? decimal.Round((decimal)(noOfContacts - prevNoOfContacts) / (decimal)prevNoOfContacts * 100, 1) : (decimal?)null;

        Console.WriteLine("OrderContact Change:" + Change + " expected: 150");

    }

    private static void NetFailRate1(){

        decimal currentNetFailRate = (decimal)5.2;

        decimal prevNetFailRate = (decimal)1;

        var Change = prevNetFailRate != 0 ? decimal.Round((decimal)(currentNetFailRate - prevNetFailRate) / prevNetFailRate * 100, 1) : 0;

        Console.WriteLine("NetFailRate Change:" + Change + " expected: 420");

    }

    private static void NetFailRate2(){

        decimal currentNetFailRate = (decimal)4.75;

        decimal prevNetFailRate = (decimal)6;

        var Change = prevNetFailRate != 0 ? decimal.Round((decimal)(currentNetFailRate - prevNetFailRate) / prevNetFailRate * 100, 1) : 0;

        Console.WriteLine("NetFailRate Change:" + Change + " expected: -20.8");

    }

    private static void AvgResponseTime1(){

        decimal? avgValue = (decimal)3.5;

        decimal? prevAvgValue = (decimal)4.0;

​

        var AverageResponseTime = avgValue.HasValue ? decimal.Round(avgValue.Value) : avgValue;

        var Change = (avgValue.HasValue && prevAvgValue.HasValue) ? decimal.Round((avgValue.Value - prevAvgValue.Value) / prevAvgValue.Value * 100, 1) : (decimal?)null;

        Console.WriteLine("AverageResponseTime:" + AverageResponseTime + " Change:" + Change + " expected: -12.5");

    }

    private static void AvgVendorDelay1(){

        decimal? avgValue = (decimal)10;

        decimal? prevAvgValue = (decimal)4.0;

​

        var AverageDelayTime = avgValue.HasValue ? decimal.Round(avgValue.Value) : avgValue;

        var Change = (avgValue.HasValue && prevAvgValue.HasValue) ? decimal.Round((avgValue.Value - prevAvgValue.Value) / prevAvgValue.Value * 100, 1) : (decimal?)null;

        Console.WriteLine("AverageDelayTime:" + AverageDelayTime + " Change:" + Change + " expected: 150");

    }

}