package com.company;

import java.io.Console;

public class Main
{
    public static void main(String[] args)
    {
        if(args.length != 2)
        {
            System.err.println("Invalid number of arguments");
            System.exit(1);
        }
        else
        {


            double x;
            double k;
            String error = "Invalid argument! You entered: ";

            try {
                x = Double.parseDouble(args[0]);
            }
            catch (IllegalArgumentException e) {
                System.err.println(error +  args[0]);
                x = 1;
            }

            try {
                k = Integer.parseInt(args[1]);
            }
            catch (IllegalArgumentException e) {
                System.err.println(error + args[1]);
                k = 2;
            }


            if ( k <= 1 )
            {
                System.err.println("Invalid argument: " + k);
                System.exit(1);
            }

            double Eps = 1 / Math.pow(10, k+1);
            double result = 0;
            double step = 1;
            int n = 1;

            while (Math.abs(step) >= Eps)
            {
                result += step;
                step = (step * x * x) / (n * (n + 1));
                n += 2;
            }

            String fmt = "%10." + k + "f\n";
            System.out.print("My Taylor: ");
            System.out.printf( fmt, result );
            System.out.printf( fmt, Math.cosh(x));
            System.exit(0);
        }
    }
}