package com.company;

import java.util.Scanner;
import java.lang.Math;

public class Main {

    public static void main(String[] args) {
        Scanner inConsole = new Scanner(System.in);
        System.out.print("Введите число n = ");
        int n = inConsole.nextInt();
        while (n == 0) {
          System.out.print("ОШИБКА! Введит чило n>0 = ");
          n = inConsole.nextInt();
        }

        System.out.print("Введите число x = ");
        double x = inConsole.nextDouble();

        System.out.println(counterSUM(n, x));

        System.out.print(" Введите e = ");
        double e = inConsole.nextDouble();
        while (e > 1) {
            System.out.print("ОШИБКА! Введите е<1: ");
            e = inConsole.nextDouble(); }

        System.out.println(counterSumWithE(e, x));
        System.out.println(counterSumWithE(e / 10, x));

        System.out.print(counterSumWithMath(x));
    }

    static double parameters (double fraction , int i, double x) {
        fraction = fraction * x / i;
        return fraction;
    }

    static double counterSUM(int n, double x) {
        double first = 1;
        double amount = 0;
        for (int i = 1; i <= n; i++) {
            amount += first;
            first = parameters (first, i, x);
        }
        return amount;
    }

    static double counterSumWithE(double e, double x) {
        double fractionNew = 1;
        int k = 1;
        double amount = 0;
        while (Math.abs(parameters(fractionNew, k, x)) > e ) {
            amount += fractionNew;
            k++;
            fractionNew = parameters(fractionNew, k, x);
        }
        return amount;
    }

    static double counterSumWithMath(double x) {
        return Math.pow(Math.E, x);
    }
}