lb2.7.8

#include "stdafx.h"
#include <iostream>
#include <iomanip>
using namespace std;

int main()
{
    setlocale(LC_ALL, "rus");
    double x;
    int n;
    cout << "n = ";
    cin >> n;
    x = 1;
    cout << setw(5) << "x |" << setw(15) << " Сумма обычная |" << setw(12) << " слагаемых |" << setw(12) << " умножений |"
        << setw(13) << " по Горнеру |" << setw(12) << " слагаемых |" << setw(11) << " умножений " << endl;


    while (x <= 3) {
        double s_sum = 6;
        double l = -x*x; //первое слагаемое
        s_sum += l;
        int s_mult_count = 1;
        int s_adds_count = 1;

        for (int cur_n = 1; cur_n < n; cur_n++) {
            l *= -(cur_n + 1)*x*x / cur_n;
            s_mult_count += 4;
            s_sum += l;
            s_adds_count++;
        }


        int sig = !(n % 2) ? 1 : -1;
        double g_sum = sig*n;
        int g_adds_count = 0;
        int g_mult_count = 1;

        for (int currentn = n - 1; currentn >= 0; currentn--) {
            sig = -sig;
            g_sum = g_sum*x*x + sig*currentn;
            g_mult_count += 3;
            g_adds_count++;
        }
        g_sum += 6;
        g_adds_count++;

        cout << setw(3) << x << setw(15) << s_sum << setw(12) << s_adds_count << setw(12) << s_mult_count
            << setw(13) << g_sum << setw(12) << g_adds_count << setw(11) << g_mult_count << endl;
        x += 0.2 - 1e-16;
    }
    return 0;
}