Metric_Converter

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

namespace Metric_Converter
{
    class Program
    {
        static void Main(string[] args)
        {
            var metricValue = double.Parse(Console.ReadLine());
            var metricInName = Console.ReadLine();
            var metricOutName = Console.ReadLine();

            byte indexIn = 0;
            byte indexOut = 0;
            string[] metricName = { "m", "mm", "cm", "mi",
                                    "in", "km", "ft", "yd" };
            double[] metricRate = { 1d,    1000d,       100d,    0.000621371192d,
                                     39.3700787d, 0.001d, 3.2808399d, 1.0936133d};

            for (byte i = 0; i < metricName.Length; i++)
            {
                if (metricInName == metricName[i])  indexIn = i;
                if (metricOutName == metricName[i]) indexOut = i;
            }

            double metricOut = metricValue * metricRate[indexOut] /
                metricRate[indexIn];

            Console.WriteLine($"{metricOut:f8}");
        }
    }
}