3.3

#include <iostream>
#include <math.h>
#include <iomanip>

using namespace std;

int n;
int precision = 7;
int spacing = precision + 4;

long double s_f(long double x)
{
    long double s = 1;
    long double last = s;

    n = 0;

    while (last > 1e-7)
    {
        long double k = x * x * (2 * n + 3) / (2 * n + 1) / (n + 1);

        s += k * last;
        last *= k;

        n++;
    }

    return s;
}

long double y_f(long double x)
{
    return (1 + 2 * x * x) * exp(x * x);
}

void doPrinting()
{
    for (long double i = 0.0; i <= 1.1; i += 0.2)
    {
        cout << setw(spacing) << i;
        cout << setw(spacing) << y_f(i);
        cout << fixed << setw(spacing) << setprecision(precision) << s_f(i);
        cout << setw(spacing) << n << endl;
    }
}

int main()
{
    system(" chcp 1251 > nul");

    cout << setw(spacing) << "x";
    cout << setw(spacing) << "Y(x)";
    cout << setw(spacing) << "S(x)";
    cout << setw(spacing) << "N" << endl;

    doPrinting();
    cin.ignore();
}