using System;

using System.Diagnostics;

public class Program

{

    public static void Main()

    {

        var watch = new Stopwatch();

        var character ='0';

        var iterations = int.MaxValue / 10;

        watch.Start();

        for(int i = 0; i < iterations; i++)

            CharNumericConvert(character);

        watch.Stop();

        Console.WriteLine($"{nameof(CharNumericConvert)} = {watch.ElapsedMilliseconds} ms");

        watch.Reset();

        watch.Start();

        for(int i = 0; i < iterations; i++)

            CharNumericParse(character);

        watch.Stop();

        Console.WriteLine($"{nameof(CharNumericParse)} = {watch.ElapsedMilliseconds} ms");

    }

    private static int CharNumericConvert(char c) => c - 48;

    private static double CharNumericParse(char c) => Char.GetNumericValue(c);

}