Лаба 8 Вариант 7

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


using namespace std;


typedef double(*uf)(double, double, int &);
void tabl(double, double, double, double, uf);
double y(double, double, int &);
double s(double, double, int &);

int main()
{
    cout << setw(8) << "x" << setw(15) << "y(x)" << setw(10) << "k" << endl;
    tabl(-0.5, 0.5, 0.1, 1e-5, y);
    cout << endl;
    cout << setw(8) << "x" << setw(15) << "s(x)" << setw(10) << "k" << endl;
    tabl(-0.5, 0.5, 0.1, 1e-5, s);
    return 0;
}

void tabl(double a, double b, double h, double eps, uf fun)
{
    int k = 0; double sum;
    for (double x = a; x < b + h / 2; x += h)
    {
        //таки я столкнулся с таким феноменом что -0,1 + 0.1 != 0
        //а равно 2.7755e-17
        if (fabs(x) < 1e-8)
            x = 0;

        sum = fun(x, eps, k);
        cout << setw(8) << x << setw(15) << sum << setw(10) << k << endl;
    }
}

double y(double x, double eps, int &k)
{
    double a = (1 + x) / (1 - x);
    return 0.25 * log(a) - 0.5 * atan(x);
}

double s(double x, double eps, int &k)
{
    double sum = 0, a = pow(x, 3), b = 3, r = 0;
    k = 1;
    while (fabs(a / b) > eps)
    {
        sum += a / b;
        a *= pow(x, 4);
        b += 4;
        k++;
    }
    return sum;
}